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-
MAC
- (1) See message authentication
code.
- (2) See Media Access Control.
-
MAC address
- See Media Access Control address.
-
machine characteristic
- Values defined
in the computer.
-
machine check
- An error condition
that is caused by an equipment malfunction.
-
machine check interruption
- An interruption
that occurs as a result of an equipment malfunction or error.
-
machine-generated data structure (MGDS)
- (1) An IBM structured data format protocol for passing character data among
the various Content Manager ImagePlus for OS/390 programs.
- (2) Data
extracted from an image and put into general data stream (GDS) format.
-
machine instruction
- (1) A binary number
that directs the operation of a processor. Compilers and assemblers convert
source instructions to machine instructions.
- (2) See computer instruction.
-
machine interface (MI)
- The interface,
or boundary, between the operating system and the Licensed Internal Code.
-
machine language
- See computer language.
-
machine level control (MLC)
- A database
that contains the engineering change (EC) level and configuration of products
in the field.
-
machine object
- A program object that
has no defined storage form; the object is defined internally to the machine.
The machine aspect is not available to the user. See also data object.
-
machine-readable
- Pertaining to data
a machine can acquire or read from a storage device, a data medium, or other
source.
-
machine-reported product data (MRPD)
- Product data gathered by a machine and sent to a destination such as an IBM
support server or RETAIN. This data includes information about the configuration
and connections of this particular machine.
-
machine storage pool
- A storage pool
used by the machine and certain highly shared programs, whose size is specified
in the system value QMCHPOOL.
-
MAC protocol
- See Media Access Control protocol.
-
macro
- (1) In REXX, a program that performs
certain operations, such as text editor operations, in applications.
- (2) An instruction that causes the execution of a predefined sequence of
instructions.
- (3) A program that performs a series of automated tasks
on behalf of the user. A macro consists of three components: the trigger (when
it acts), the search (what documents it acts on), and the action (what it
does).
- (4) An XML script that defines a set of screens. Each screen
includes a description of the screen, the actions to perform for that screen,
and the screen or screens that can be presented after the actions are performed.
A macro can be specified as one of the actions to be taken when a host screen
matches the screen recognition criteria of a screen customization.
-
macro call
- See macro.
-
macroinstruction
- See macro.
-
macro temporary store (MTS)
- The SMP/E
data set used to hold updated versions of macros that will not be placed in
a target system library. They are stored during APPLY processing and deleted
by ACCEPT or STORE processing.
-
MAC sublayer
- See medium access control sublayer.
-
MADS
- See multiple
area data set.
-
magic number
- A numeric or string
constant in a file that indicates the file type.
-
magnetic ink
- An ink that contains
particles of a magnetic substance whose presence can be detected by magnetic
sensors.
-
magnetic ink character recognition
- The identification of characters through the use of magnetic ink. See also
optical character recognition.
-
magnetic storage device controller
- The I/O controller card in the card enclosure that controls the operation
of the disk, diskette, and tape devices.
-
magnetic stripe reader
- A device,
attached to a display station, that reads data from a magnetic stripe on a
badge before allowing an operator to sign on.
-
magnetic tape drive
- A technique for
moving and controlling magnetic tape.
-
magnetic tape subsystem
- A tape unit
that includes the logic interface hardware necessary to operate with a system.
-
magnetic tape unit
- A device for reading
or writing data from or to magnetic tape.
-
magneto-optic recording (MO recording)
- A method of storing information on magneto-optic media using a laser
and magnetic read/write heads. A laser is used to heat a small spot on the
media that the write head alters magnetically. The ability to focus the laser
tightly increases the data density over standard magnetic media. MO disks
are erasable and rewritable.
-
mail
- The distribution objects and
documents referred to by a mail log.
-
mailbox
- A collection of pointers
to message objects that are addressed to a single entity.
-
mail exchange record (MX record)
- A record in the Domain Name System (DNS) that indicates which host handles
mail for a particular domain.
-
mail gateway
- A machine that connects
two or more electronic mail systems (often, mail systems on different networks)
and transfers messages between them.
-
mail server framework (MSF)
- A set
of user exit points and application program interfaces (APIs) that embody
an abstract design for solutions to a number of related communications problems.
-
mail session
- A resource collection
of protocol providers that authenticate users and control user access to messaging
systems.
-
main
- A processor, named by an initialization
statement, on which jobs can execute. A main represents a single instance
of MVS. The two types of mains are global main and local main.
-
main branch
- The starting branch of
a version tree of an element. The default name for this branch is main.
-
main device scheduler (MDS)
- A device
management facility that controls the setup of input/output (I/O) devices
associated with job execution.
-
main distribution frame (MDF)
- In
the CallPath licensed program, a series of quick-connection blocks, supported
on a frame, that allows trunk lines and telephones to be connected to the
9722 Redwood system.
-
main DSP
- A dynamic support program
(DSP) that chooses jobs and supplies them to the MVS initiators.
-
main entry
- A first-level or primary
index entry in an index. Main entries are the key access points to the information,
representing the main concepts in the information. They use both the product
and the users' terminology.
-
mainframe
- A computer, usually in
a computer center, with extensive capabilities and resources to which other
computers may be connected so that they can share facilities.
-
main function
- A function that has
the identifier main. Each program must have exactly one function named main.
The main function is the first user function that receives control when a
program starts to run.
-
main index build
- In enterprise search,
the process of building the entire index. See also delta index build.
-
mainline module
- A sequence of instructions
called by a program in the main path after it is compiled.
-
mainline routine
- The first subroutine
encountered when link-editing.
-
main program
- (1) The highest level program
involved in a run unit.
- (2) The first program unit to receive control
when a program is run.
- (3) The first routine in an enclave to gain
control from the invoker. See also subprogram.
-
main service
- A dynamic support program
(DSP) that provides operator control over jobs.
-
main storage
- (1) The part of internal
storage into which instructions and other data must be loaded for running
or processing.
- (2) Program-addressable storage from which instructions
and other data can be loaded directly into registers for subsequent execution
or processing.
- (3) See memory.
-
main storage database (MSDB)
- (1) A root-segment
database that resides in virtual storage. The data in an MSDB is stored in
segments. Each segment can be available to all terminals or assigned to a
specific terminal; however, segments cannot be assigned to a terminal that
is defined through ETO. See also Fast Path.
- (2) In IMS, a root-segment database that resides in main storage and that
can be accessed to a field level.
-
main storage dump (MSD)
- (1) A representation
of the contents of main storage that was captured during a suspected i5/OS
failure. This memory content is used for problem analysis.
- (2) A process
of collecting data from the system's main storage. It can be done automatically
by the service processor as a result of a system failure, or it can be performed
manually by the operator when there appears to be a system failure.
-
main storage dump space
- A section
of storage reserved on the disk unit that is used as a place to save main
storage for recovery and debugging.
-
main storage pool
- A division of main
storage, which allows the user to reserve main storage for processing a job
or group of jobs, or to use the pools defined by the system. See also auxiliary storage pool.
-
main storage - TS queue
- A dynamic
storage area managed by CICS under the temporary storage facility. Data in
main storage is not kept from one CICS run to the next. See also auxiliary storage - TS queue.
-
maintain system history program (MSHP)
- A program used for automating and controlling various installation,
tailoring, and service activities for a VSE system.
-
maintenance
- In Backup, Recovery,
and Media Services, the tasks that must be performed on a routine basis to
perform cleanup activities and other Backup, Recovery, and Media Services
functions. Examples of maintenance are tape expiration, recovery analysis
reports, and media movement.
-
maintenance analysis procedure (MAP)
- In hardware maintenance, a step-by-step procedure that assists an IBM service
representative to trace a symptom to the cause of the failure.
-
maintenance change level (MCL)
- A
set of changes to Licensed Internal Code (LIC). MCL is functionally equivalent
to a software program temporary fix (PTF) and is intended for broad distribution.
See also fix pack.
-
maintenance-level keyword
- In diagnosing
program failures, a keyword that identifies the maintenance level of DFSMSdss.
-
maintenance mode
- The state in which
a device can be serviced but no policy-based automated provisioning can occur.
-
maintenance point
- A CICSPlex SM address
space (CMAS) that is responsible for maintaining CICSPlex SM definitions in
its data repository and distributing them to other CMASs involved in the management
of a CICSplex.
-
maintenance window
- A user-defined
time period for running only required automatic maintenance activities. See
also automatic maintenance.
-
main window
- In VisualAge RPG, a window
that is an immediate child of the desktop.
-
major/activity token
- In OSI, the
session-layer token that controls activities and major synchronize operations.
-
major object descriptor block (MODB)
- In CICSPlex SM, a control structure built by Kernel Linkage during initialization
of a CICSPlex SM component that contains a directory of all methods that make
up that component. The structure of the MODB is the same for all components.
-
major object environment block (MOEB)
- In CICSPlex SM, a control structure built by Kernel Linkage during initialization
of a CICSPlex SM component and pointed to by the MODB. MOEB stores information
critical to a CICSPlex SM component and anchors data used by the component.
The structure of the MOEB is unique to the component it supports.
-
major synchronization point
- In OSI,
a session-layer synchronization point that usually represents a logically
significant piece of work. Major synchronization points are a confirmed service.
See also minor synchronization point.
-
major synchronize
- In OSI, a confirmed
service provided by the session layer that enables peer application entities
to synchronize the exchange of data. For example, an application entity can
send data followed by a major synchronize request; its peer sends back a major
synchronize response, which indicates that it has received all of the data
that was sent up to the major synchronize request. The major synchronization
function also marks a recovery point in the data stream. See also minor synchronize.
-
major tick
- In Business Graphics Utility,
a mark on an axis that denotes character grid units on a chart. See also minor tick.
-
make
- In VisualAge RPG, the process
by which all of the components are compiled and assembled to create a VRPG
application.
-
makefile
- (1) A text file that contains
commands, which may include commands to do backups, set up build environments,
or start execution of a program. Traditionally, makefiles specify the dependencies
of target files on source files.
- (2) In UNIX, a text file containing
a list of an application's parts. The make utility uses makefiles to maintain
application parts and dependencies.
-
make utility
- A utility that maintains
all of the parts and dependencies for an application. The make utility uses
a makefile to keep the parts of a program synchronized. If one part of an
application changes, the make utility updates all other files that depend
on the changed part.
-
malformed packet
- A packet that does
not conform to TCP/IP standards for size, destination, checksum, or flags
in the TCP header.
-
MAN
- See metropolitan
area network.
-
manageability
- The ability to manage
a resource, or the ability of a resource to be managed. (OASIS)
-
manageability capability
- A capability
associated with one or more management domains. (OASIS)
-
manageability capability interface
- A Web service interface representing one manageability capability. (OASIS)
-
manageability consumer
- A user of
manageability capabilities associated with one or more manageable resources.
(OASIS)
-
manageability endpoint
- A Web service
endpoint associated with and providing access to a manageable resource. (OASIS)
-
manageability interface
- (1) A service
of a managed resource that includes the sensor and effector that are available
to an autonomic manager. The autonomic manager uses the manageability interface
to monitor and control the managed resource and any of its managed resources.
See also autonomic control loop, effector, management topic, sensor, touchpoint.
- (2) The composition
of one or more manageability capability interfaces. (OASIS)
-
manageable resource
- A resource capable
of supporting one or more standard manageability capabilities. (OASIS)
-
managed asset
- A component or resource
that is enabled for workspaces and allows content to be written to separate
workspace database schemas. See also quick publish.
-
Managed Bean (MBean)
- In the Java
Management Extensions (JMX) specification, the Java objects that implement
resources and their instrumentation.
-
managed device
- A non-node device
for which Cluster Systems Management supports power control and remote console
access.
-
managed disk (MDisk, mdisk)
- A Small
Computer System Interface (SCSI) logical unit (LU) that a Redundant Array
of Independent Disks (RAID) controller provides and a cluster manages. The
MDisk is not visible to host systems on the storage area network (SAN).
-
managed disk group
- A collection of
managed disks (MDisks) that, as a unit, contain all the data for a specified
set of virtual disks (VDisks).
-
managed element
- See managed resource.
-
managed environment
- An environment
where services, such as transaction demarcation, security, and connections
to Enterprise Information Systems (EISs), are managed on behalf of the running
application. Examples of managed environments are the Web and Enterprise JavaBeans
(EJB) containers.
-
managed group
- A group of systems
or objects managed by IBM Director.
-
managed manual mode
- The mode of operation
that allows the user to locate and move cartridges to and from drives and
cells under the direction of the library manager. The library robot implements
this mode. See also manual mode.
-
managed mode
- An environment in which
connections are obtained from connection factories that the Java EE server
has set up. Such connections are owned by the Java EE server.
-
managed node
- (1) In Internet communications,
a workstation, server, or router that contains a network management agent.
In the Internet Protocol (IP), the managed node usually contains a Simple
Network Management Protocol (SNMP) agent.
- (2) In a Tivoli environment,
a computer system on which Tivoli Management Framework is installed.
- (3) A node that is federated to a deployment manager and contains a node
agent and can contain managed servers. See also node.
-
managed object
- A resource that is
subject to management as viewed from a systems management perspective. Examples
of such resources are a connection, a scalable system, or a line.
-
Managed Object Format (MOF)
- A language
for defining Common Information Model (CIM) schemas.
-
managed object ID
- A unique identifier
for each managed object.
-
managed query
- A query that is subject
to the Query Patroller thresholds and parameters that control how a query
is handled: for example, whether it is allowed to run, is queued, or is rejected.
See also intercepted query, held query, query status.
-
managed resource
- (1) In a Tivoli environment,
a database object that represents a resource and is governed by policies.
See also resource, autonomic
computing distributed infrastructure.
- (2) An entity that exists
in the runtime environment of an IT system and that can be managed. See also
effector, monitor component, sensor.
-
managed resource ID
- The globally
unique identifier (GUID) for an instance of a managed resource that can be
used to compare the managed resource with another managed resource and find
an endpoint reference (EPR) for the managed resource. See also endpoint reference.
-
managed resource interface
- See manageability interface.
-
managed resource prototype
- An XML
document that describes a resource type and extends the manageability interface
of the managed resource such that it can be easily and readily located within
a system. Whereas a manageability interface can be used by many managed resources
of the same resource type, the managed resource prototype describes the resource
properties and any restrictions on the possible values for those properties.
See also resource type.
-
managed server
- A server within a
managed node, to which SCA modules and applications can be deployed.
-
managed software system (MSS)
- An
installed management system product that implements the managed operations
that are targets for logical operations. An MSS contains information about
configuration items, and this information is discovered by a sensor or discovery
library adapter. Its functions might be invoked by a system integration module.
-
managed space mode
- An access mode
that enables virtualization functions to be performed. See also access mode, unconfigured mode, image mode.
-
managed system
- A system that is being
controlled by a given system management application.
-
Managed System Services
- An IBM licensed
program that enables a system to be managed by a central site ES/9000 system
running the IBM NetView Distribution Manager program. Managed System Services
enables objects and program temporary fixes (PTFs) to be sent or retrieved,
PTFs to be applied, programs to be run, and the central site system to control
an initial program load (IPL) of the system.
-
managed target
- A plug-in application
that requires the support of user accounts from Tivoli Identity Manager.
-
management agent
- An agent that is
installed on a monitored computer and that communicates information to a management
server. The management agent provides the following functions: discovery,
listening and playback, ARM engine for data collection, policy management,
threshold setting, event support, and Store and Forward.
-
management application
- A software
product or solution that uses the components of the Tivoli common agent services
to manage a resource. A management application might provide one or more resource
managers. See also resource manager.
-
Management Central
- A suite of systems
management functions that is an integrated part of System i Navigator. Management
Central provides the base for managing multiple systems.
-
management class
- (1) In storage management,
a policy object that users can bind to each file to specify how the server
manages the file. The management class can contain a backup copy group, an
archive copy group, and space management attributes. The copy groups determine
how the server manages backup copies or archive copies of the file. The space
management attributes determine whether the file is eligible to be migrated
from the space manager client nodes to server storage and under what conditions
the file is migrated.
- (2) A user-defined schedule for moving objects
from one storage class to the next. Management class describes the retention
and class transition characteristics for a group of objects in a storage hierarchy.
-
management collection
- An object within
the i5/OS operating system that includes the data for a number of collections.
The collections begin when the collector is started and continue until the
collection is either ended or cycled. The system-recognized identifier for
the object type is *MGTCOL.
-
management console
- A system (server,
desktop computer, workstation, or mobile computer) on which IBM Director Console
is installed.
-
management control point
- See management server.
-
management domain
- (1) In OSI X.400, a
set of one or more message transfer agents and zero or more user agents that
make up a system capable of handling messages and is managed by either an
administration or private company.
- (2) A set of nodes that are configured
for management by Cluster Systems Management. Such a domain has a management
server that is used to administer a number of managed nodes. Only management
servers have knowledge of the domain. Managed nodes only know about the servers
managing them.
- (3) An area of knowledge relative to providing control
over, and information about the behavior, health and life cycle of manageable
resources.
-
management information
- In OSI, information--associated
with a managed object--that is operated on by management protocols to control
and monitor that object.
-
Management Information Base (MIB)
- (1) In the Simple Network Management Protocol (SNMP), a database of objects that
can be queried or set by a network management system.
- (2) A definition
for management information that specifies the information available from a
host or gateway and the operations allowed.
-
Management Information Base variable (MIB variable)
- A managed object that contains pertinent management information,
which is accessible as defined by the access mode. The MIB variable is defined
by a textual name and the corresponding object identifier, syntax, access
mode, and status, as well as a description of the semantics of the managed
object.
-
management module
- (1) In a Tivoli environment,
a file that contains the management information and instrumentation for enabling
a particular application or business system to be managed by Tivoli management
software. This file may be in the form of a Tivoli installation image or an
application management package. Types of management modules include base modules,
Tivoli Business Systems Manager modules, and Tivoli Plus modules.
- (2) The BladeCenter component that handles system-management functions. It configures
the chassis and switch modules, communicates with the blade servers and all
I/O modules, multiplexes the keyboard/video/mouse (KVM), and monitors critical
information about the chassis and blade servers.
-
management protocols
- In OSI, protocols
for use in systems management.
-
management region
- The set of managed
objects on a particular map that defines the extent of the network that is
being actively managed. The management region may vary across Tivoli NetView
maps.
-
management server
- (1) The control center
of the Tivoli Monitoring for Transaction Performance software. The management
server collects information from and provides services to the deployed management
agents. The management server provides the services and user interface needed
for centralized management.
- (2) The server on which IBM Director Server
is installed.
- (3) The server and logical partition (LPAR) that are
configured to manage Cluster Systems Management nodes.
-
management server domain
- A type of
cluster domain that consists of one or more management nodes that are used
to administer one or more redundancy nodes. See also cluster domain node.
-
management services (MS)
- In SNA,
one of the types of network services in control points and physical units.
Management services is the service provided to assist in the management of
SNA networks, such as problem management, performance and accounting management,
configuration management, and change management.
-
management topic
- A set of operations
and data elements that define a manageability interface for a managed resource.
See also manageability interface.
-
management VLAN
- See service network.
-
manager
- (1) The part of a distributed
management application that issues requests and receives notifications; that
is, uses the services of one or more agents.
- (2) In DCE Remote Procedure
Call (RPC), a set of remote procedures that implement the operations of an
RPC interface and that can be dedicated to a given type of object.
- (3) See managing process.
-
manager access
- The highest access
level that can be assigned in a Notes database access control list.
-
manager entry point vector
- In the
Distributed Computing Environment Remote Procedure Call (RPC), the entry point
vector used by the runtime code on the server side to dispatch incoming RPCs.
-
manager list
- In OSI, a list that
an agent maintains of the managing processes that are--or are eligible to
become--managers of that agent.
-
manager node
- In OSI, a node that
provides a managing process.
-
managing process
- In OSI, the part
of a systems management application that monitors and controls the resources
of an agent process. In OSI Communications Subsystem, the managing process
can send operator commands to--and receive event reports from--its agent processes.
-
mandatory entry field
- A field in
which an operator must enter at least one character.
-
mandatory feature
- A feature that
is always deployed when the software entity exposing it is deployed.
-
mandatory fill field
- A field that
a user must leave blank, or must fill in completely.
-
mandatory place
- A shared place, either
a public place or a restricted place, in which all portal users must be members.
Only portal administrators can designate a shared place to be a mandatory
place. Because membership is automatic and required, portal users cannot join
or leave mandatory places.
-
mandatory print labeling (MPL)
- A
class, defined to the Resource Access Control Facility (RACF), that causes
PSF to automatically label separator pages and data pages and to enforce the
user-printable area.
-
mangled name
- An external name, such
as a function or variable name, which has been encoded during compilation
to include type and scope information.
-
mangling
- The encoding, during compilation,
of C++ identifiers such as function and variable names to include type and
scoping information. The linker uses these mangled names for type-safe linkage.
See also demangling.
-
manifest
- (1) A special file that can
contain information about the files packaged in a JAR file. (Sun)
- (2) A text file that specifies the properties of a diagnostic guide or a tool.
- (3) A shipment confirmation that may contain tracking identification
information.
-
manifestation relationship
- In UML
modeling, a relationship that shows that an artifact implements a node.
-
manipulator
- A value that can be inserted
into streams or extracted from streams to affect or query the behavior of
the stream.
-
man page
- In UNIX systems, one page
of online documentation. Each UNIX command, utility, and library function
has an associated man page.
-
manual answer
- In data communications,
a line type that requires operator actions to receive a call over a switched
line. See also automatic answer.
-
manual call
- In data communications,
a line type requiring operator actions to place a call over a switched line.
See also automatic calling.
-
manual cartridge-entry processing
- The process by which a volume is added to the tape configuration database
(TCDB) when it is added to a manual tape library (MTL). DFSMSrmm can initiate
this process.
-
manual connection
- A virtual private
network (VPN) connection in which all of the parameters of a manual connection
must be set up manually. Manual connections do not automatically refresh the
keys that maintain data security. See also dynamic
connection.
-
manual emulator
- An emulator that
requires users to specify response values for an emulated component or reference
at run time. See also programmatic emulator, emulator.
-
manual IPL
- See attended mode IPL.
-
manual load
- In Q replication, a load
process in which the user loads data into a target table and then notifies
the replication program. See also automatic load.
-
manual mode
- (1) The mode of operation
of an Automated Tape Library Dataserver (ATLDS) that allows the operator to
locate and move the cartridges to and from drives and cells under the direction
of the library manager. In manual mode, the robot is not operating. See also
managed manual mode.
- (2) The mode of operation
in which DFSMSrmm runs without recording volume usage or validating volumes.
The DFSMSrmm Time Sharing Option (TSO) commands, Interactive System Productivity
Facility (ISPF) dialog, and inventory management functions are all available
in manual mode. See also record-only mode, warning mode.
- (3) An operating mode in which an administrator
must manually initiate deployment requests on applications or application
tiers.
-
manual tape library (MTL)
- A set of
tape drives defined as a logical unit (LU) by the installation, along with
the set of system-managed volumes that can be mounted on those drives. See
also Automated Tape Library Dataserver, tape library.
-
Manufacturing Automation Protocol (MAP)
- In OSI, a specification developed by industrial users to provide a common
set of protocols to allow communications between computers and factory floor
equipment in the manufacturing environment. It is based on a subset of the
open systems interconnection (OSI) standard.
-
manufacturing refresh
- An update of
an existing product release in which the product media are completely replaced.
A manufacturing refresh contains new function and cumulative fixes. It is
intended for new customers who want to install the current level of the product
and as an upgrade for existing installations of the release. See also test fix, interim fix, refresh pack, fix.
-
MAP
- (1) See Manufacturing
Automation Protocol.
- (2) See maintenance
analysis procedure.
- (3) See mobile application
part.
-
map
- (1) In the EJB development environment,
the specification of how an enterprise bean's container-managed persistent
fields correspond to columns in a relational database table or other persistent
storage.
- (2) A named collection of objects, symbols, submaps, and
their relationships, all of which represent the network topology.
- (3) In BMS, a format established for a page or a portion of a page, or a set of
screen format descriptions. A map relates program variables to the positions
in which their values appear on a display device. A map contains other formatting
information such as field attributes. A map describes constant fields and
their position on the display, the format of input and output fields, the
attributes of constant and variable fields, and the symbolic names of variable
fields.
- (4) An entity that contains the Java code to specify how to
transform attributes from one or more source business objects to one or more
destination business objects. A map either converts from an application-specific
business object to a generic business object (outbound map) or from a generic
business object to an application-specific business object (inbound map).
- (5) A specialized task that transforms data from one structure to
another.
- (6) To correlate fields in a Java class to columns in a relational
database table or other persistent storage.
-
map chaining
- The process of producing
multiple documents from a single document by executing several maps to translate
the single document.
-
map control string
- An object compiled
from a map, which contains the instructions used by the translator to translate
a document from one format to another.
-
map definition
- Definition of the
size, shape, position, potential content, and properties of BMS map sets,
maps, and fields within maps, by means of macros. See also field definition macro, map definition macro, map set definition macro.
-
map definition macro (DFHMDI)
- In
BMS, a macro that defines a map within the map set defined by the previous
DFHMSD macro. See also map definition.
-
Map Designer
- A WebSphere business
integration code-generation tool with which you create and edit map definitions
to define transformations between source and destination business objects.
-
MAPE-K loop
- See autonomic manager.
-
MAPE loop
- See autonomic manager.
-
mapped address
- A bidirectional mapping
of one address to another.
-
mapped conversation
- In advanced program-to-program
communications (APPC), a temporary connection between an application program
and an APPC session in which the system provides all the information on how
the data is formatted.
-
mapping
- (1) A representation of one thing
to another.
- (2) In BMS, the process of transforming field data to
and from its displayable form.
- (3) The process of transforming data
from one application-specific format to another.
- (4) The act of developing
and maintaining a map.
-
mapping cardinality
- The granularity
of the way that message elements are mapped from message source to message
target. For example, one source element to one target element, or many source
elements to one target element.
-
mapping object
- (1) A function of AFP
Utilities that maps a database field value to an object name.
- (2) An object that passes values to the IBM-supplied mapping program. It is used
to customize the PDF subsystem without writing a mapping program. See also
mapping program, PDF subsystem.
-
mapping program
- An exit program used
to interpret routing tags, to specify the subject of an e-mail, to add text
to the beginning of an e-mail, to specify the path to store the PDF stream
file, and more. See also intelligent routing, PDF subsystem, mapping object.
-
mapping specialist
- The person responsible
for creating data transformation maps, validation maps, and functional acknowledgment
maps using the Data Interchange Services client.
-
mapping table
- (1) An object that contains
a set of hexadecimal characters used to map data from one character set and
code page to another. For example, unprintable characters can be mapped to
blanks, and lowercase alphabetic characters can be mapped to uppercase characters.
- (2) A table that the REORG utility uses to map the associations of
the RIDs of data records in the original copy and in the shadow copy. This
table is created by the user.
-
map record
- The record that maps the
tracks dumped by DFSMSdss.
-
map set
- In basic mapping support
(BMS), one or more maps combined in a map set. The effects of this combination
are to reduce the number of entries in the PPT, and to load simultaneously
all maps needed for one application.
-
map set definition macro (DFHMSD)
- A macro that is used to define a set of BMS maps. See also map definition.
-
map set suffix
- In BMS, a suffix relating
different versions of a map set to different terminal models or partitions.
This allows you to format the same data differently on different screen types,
in response to the same programming request.
-
margin A
- The margin between the 7th
and 8th character positions of a reference format for a COBOL source program
line.
-
margin B
- The margin between the 11th
and 12th character positions of a reference format for a COBOL source program
line.
-
margin C
- The margin between the 6th
and 7th character positions of a reference format for a COBOL source program
line.
-
margin L
- The margin immediately to
the left of the leftmost character position of a reference format for a COBOL
source program line.
-
margin R
- The margin immediately to
the right of the rightmost character position of a reference format for a
COBOL source program line.
-
margin text
- Notes written in the
margins on the top, bottom, left, or right of a document.
-
marker
- In the GDDM function, a symbol
centered on a point. Line charts may use markers to indicate the plotted points.
-
marker bar
- The gray border at the
left of the editor area of the workbench, where bookmarks and breakpoints
are shown.
-
market basket analysis
- A data mining
process for analyzing sales transaction data that determines which products
customers purchase together. Retail organizations can use market basket analysis
to optimize the placement of products on Web sites or on shelves.
-
marketing event
- In WebSphere Commerce,
any event within the system that is considered to be significant for the purposes
of marketing. Examples include catalog browsing, navigation, and shopping
cart activity.
-
marketing manager
- A defined role
in WebSphere Commerce that monitors, analyzes, and understands customer behavior.
The marketing manager also creates and modifies customer segments for targeted
selling and creates and manages campaigns.
-
marketplace
- A business-to-business
e-commerce Web site in which those organizations granted access to the site
are presented with a unified view of the products and services being traded
on that site. They are also provided with a variety of trading mechanisms
to facilitate trade among themselves.
-
marking
- (1) In QoS, the process of setting
the bits in the Internet Protocol (IP) type-of-service byte. This is primarily
a mechanism that is used in differentiated services. As an example, in-profile
packets could be marked with one differentiated services code point, while
out-of-profile packets are marked with another code point.
- (2) A method
of updating certain structured fields to identify a resource as printer-resident.
-
markup language
- A notation for identifying
the components of a document to enable each component to be appropriately
formatted, displayed, or used.
-
marooned log data
- In an RSR environment,
active subsystem log data at the tracking subsystem that follows a gap. Marooned
log data cannot be processed by the tracking subsystem until the log data
that fills the gap has been received.
-
marshal
- (1) To copy data into a remote
procedure call (RPC) packet by using a stub. See also unmarshal.
- (2) To convert an object into a data stream for transmission
over a network.
-
marshaling
- See serialization.
-
MAS configuration
- See multi-access spool configuration.
-
mashup
- A Web 2.0 genre of interactive
Web applications that draw upon content retrieved from external data sources
to create entirely new and innovative services. The most prominent types of
mashups are mapping mashups, video and photo mashups, search and shopping
mashups, and news mashups.
-
mask
- (1) A pattern or template that is
applied to an Internet Protocol (IP) address to specify which bits are significant
and which bits are irrelevant.
- (2) A pattern of bits or characters
that controls the keeping, deleting, or testing of portions of another pattern
of bits or characters.
- (3) Data that is used to extract information
that is stored in another location.
-
masking character
- A character used
to represent optional characters at the front, middle, or end of a search
term. Masking characters are normally used for finding variations of a term
in a precise index. See also wildcard character.
-
masquerade NAT
- A TCP/IP function
that allows a user to translate multiple Internet Protocol (IP) addresses
to another single IP address. Masquerade NAT is used to hide one or more IP
addresses on an internal network behind an IP address that will be made public.
Traffic can initiate from the private internal addresses only.
-
mass delete
- The deletion of all rows
of a table.
-
massively parallel processing (MPP)
- The coordinated execution of a single request by multiple single-processor
computers in a shared-nothing environment (in which each computer has its
own memory and disks). See also inter-partition parallelism, database partitioning, Database Partitioning Feature.
-
master
- (1) In a multi-MVS or VSE MRO
XRF configuration, a region that issues commands to dependent regions at takeover
time. See also coordinator.
- (2) The client
that initiates a process step.
-
master address space
- The virtual
storage used by the master scheduler task.
-
master build descriptor
- In EGL, a
build descriptor part whose options cannot be overridden.
-
master catalog
- (1) The main catalog containing
all products, SKUs, descriptions, and standard pricing for each product. See
also online catalog, sales
catalog.
- (2) A key-sequenced data set (KSDS) or file with an index
containing extensive data set and volume information that the Virtual Storage
Access Method (VSAM) requires to locate data sets or files, allocate and deallocate
storage space, verify the authorization of a program or operator to gain access
to a data set or file, and accumulate usage statistics for data sets or files.
-
master configuration
- The configuration
data held in a set of files that form the master repository for either a deployment
manager profile or a stand-alone profile. For a deployment manager profile,
the master configuration stores the configuration data for all the nodes in
the network deployment cell.
-
master console
- A serviceability focal
point for the TotalStorage products that provides features such as service
alert and remove access.
-
master CQS
- The CQS that coordinates
a sysplex-wide task. The other CQSs sharing in the task are participants.
If the master CQS fails for any reason, another CQS takes over the role of
master and either continues or aborts the task.
-
master database
- In an RSR environment,
a database at the active site. If a remote takeover occurs, the shadow database
becomes the master database.
-
master file
- A collection of permanent
information, such as a file of customer addresses.
-
master index
- An index made up of
entries from two or more components or deliverables. Examples are master indexes
for a product information center, a solution containing more than one product,
or a PDF library.
-
master metadata server
- The metadata
server in a cluster that is responsible for load balancing and physical-space
allocation.
-
master name server
- A name server
that provides secondary name servers with domain data.
-
master port
- In fibre-channel trunking,
the port that determines the routing paths for all traffic flowing through
the trunking group.One of the ports in the first inter-switch link (ISL) in
the trunking group is designated as the master port for that group. See also
ISL Trunking.
-
master profile
- In System i Access
family, a file that contains the session profiles and keyboard profiles for
a user's workstation function session.
-
master release calender
- A view that
displays timelines for all of the releases that are defined in the environment.
The view provides general release information as well, and the calendar can
be toggled to show hourly, daily, weekly, and monthly timelines.
-
master replica
- (1) In the DCE Cell Directory
Service (CDS), the first instance of a specific directory in the namespace.
After copies of the directory have been made, a different replica can be designated
as the master, but only one master replica of a directory can exist at a time.
CDS can create, update, and delete object entries and soft links in a master
replica.
- (2) In ClearCase MultiSite, the replica at which a mastered
object can be modified or instances of the object can be created.
-
masters catalog
- A service that lists
and manages course masters.
-
mastership
- The ability to modify
an object or to create instances of an object in a replica.
-
masters manager
- A person who creates
classroom and learning event masters through the Administrator interface;
a person who manages the sum of learning content in the system.
-
master sort table
- A system-supplied
table that contains sort information required for sorting double-byte characters.
This table is maintained by the character generator utility function of the
Application Development ToolSet feature.
-
master system
- (1) The MVS system on which
the master DFSMSrmm control data set (CDS) resides.
- (2) In z/VM Center,
an operating system instance that has been set up to serve Virtual Server
Deployment as a model for creating operating system templates.
-
master table
- In SQL replication,
specifically in update-anywhere replication, the original source table for
data in the replica table. If replication conflict detection is enabled, changes
made to the master table are retained, whereas changes made to the replica
table are rejected. See also conflict detection, replica table, update-anywhere
replication.
-
master terminal
- (1) The IMS logical terminal
that has complete control of IMS resources during online operations.
- (2) In CICS, the terminal at which a designated operator is signed on.
-
master terminal formatting option
- An MFS option that provides a format for a 3270 master terminal.
-
master terminal function
- A function
that allows a user to dynamically control and alter the operation of a CICS
system.
-
master terminal operator (MTO)
- Any
CICS operator authorized to use the master terminal functions transaction.
-
master virtual disk
- In most cases,
the virtual disk (VDisk) that contains a production copy of the data and that
an application accesses. See also auxiliary virtual
disk, relationship.
-
master volume
- (1) A private volume that
contains data that is available for write processing.
- (2) The first
volume assigned to the system storage pool that stores the most critical system
metadata.
-
matched credit
- A credit payment that
has been matched with a credit advice. Such credits are not considered when
calculating the expected end-of-day position of their corresponding channels.
See also full matching, partial matching.
-
matched signature
- A signature that
can be defined as multiple instances of a software signature, depending on
how many instances of the software signature have been detected.
-
match fields
- In RPG primary or secondary
multifile processing, fields within a record type that are to be used for
checking the order of a single file, or for matching records of one file with
those of another file.
-
matching record indicator (MR indicator)
- An indicator used in calculation or output specifications to indicate
operations that are to be performed only when records match in primary and
secondary files.
-
matching rule
- A rule that describes
how to perform a comparison.
-
match level
- In RPG, the value (M1
through M9) assigned to the match field. The match level identifies fields
by which records are matched during primary or secondary multifile processing.
-
materialize
- (1) To put rows from a view
or nested table expression into a work file for additional processing by a
query.
- (2) To place an LOB value into contiguous storage. Because
LOB values can be very large, DB2 for z/OS avoids materializing LOB data until
doing so becomes absolutely necessary.
-
materialized query table (MQT)
- A
table whose definition is based on the result of a query and whose data is
in the form of precomputed results that are taken from the table or tables
on which the MQT definition is based. See also summary
table.
-
matrix
- An arrangement in rows and
columns.
-
mature project
- An existing project
that has a work breakdown structure (WBS) and assigned resources.
-
MAU
- See multistation
access unit.
-
maxcon
- The number of conversations
that can be active at one time.
-
max connects
- The maximum number of
foreground and background users and Time Sharing Option (TSO) connections
allowed to a DB2 subsystem.
-
maximize
- A choice that, when selected,
enlarges the window to its largest possible size.
-
maximum transfer unit (MTU)
- The maximum
number of bytes that an Internet Protocol (IP) datagram can contain.
-
maximum transmission unit (MTU)
- The largest possible unit of data that can be sent on a given physical medium
in a single frame. For example, the maximum transmission unit for Ethernet
is 1500 bytes.
-
maximum use
- A number indicating the
maximum number of times a compound or simple element can repeat.
-
Mb
- See megabit.
-
MB
- See megabyte.
-
MBCS
- See multibyte
character set.
-
MBean
- See Managed Bean.
-
MBean provider
- A library containing
an implementation of a Java Management Extensions (JMX) MBean and its MBean
Extensible Markup Language (XML) descriptor file.
-
MBO
- See message
backout table.
-
Mbps
- See megabits
per second.
-
MCA
- (1) See Micro
Channel architecture.
- (2) See message channel
agent.
-
MCAST
- A proprietary transfer protocol
that delivers the same file to several client computers using multicast. See
also PCAST.
-
MCB
- See message
control block.
-
MCDS
- See migration
control data set.
-
MCI
- See message
channel interface.
-
MCL
- See maintenance
change level.
-
MCM
- See multiple
chip module.
-
MCS
- See multiple
console support.
-
MCS console
- A device that can be
physically attached to a global or local processor.
-
MCSL
- See Monitoring
Collection Specification Language.
-
MCT
- See monitoring
control table.
-
MCU
- See multipoint
control unit.
-
MD5
- A type of message algorithm that
converts a message of arbitrary length into a 128-bit message digest. This
algorithm is used for digital signature applications where a large message
must be compressed in a secure manner.
-
MDB
- See message-driven
bean.
-
MDC table
- See multidimensional clustering table.
-
MDF
- (1) See main
distribution frame.
- (2) See multiple device
file.
-
MDH
- See migration
data host.
-
MDisk
- See managed disk.
-
mdisk
- See managed disk.
-
MDS
- See main
device scheduler.
-
MDSP
- See Mobile
Data Synchronization Protocol.
-
MDSS
- See Mobile
Data Synchronization Service.
-
MDT
- See modified
data tag.
-
mean time between failures (MTBF)
- A number representing the hours between initial use and failure of an average
unit in a specific population of units under specified conditions. MTBF is
obtained by dividing the total number of failures into the total number of
operating hours of all units.
-
mean time to recovery (MTTR)
- The
average time it takes to make a system operational after a failure.
-
mean time to repair (MTTR)
- A measure
of serviceability indicating the expected time required to repair a unit after
failure.
-
measure
- (1) A metric combined with an
aggregation type such as average, count, maximum, minimum, sum, or average.
- (2) Metrics such as count, maximum, minimum, sum, or average that
are used in a fact table. Measures can be calculated with an SQL expression
or mapped directly to a numerical value in a column.
-
measurement group
- A grouping or classification
of measurement types. This grouping can represent any of the characteristics
of the measurement, including grouping the measurements into broad classes,
such as performance or availability.
-
measurement source
- The source application
where a measurement originates.
-
measurement type
- The class or meaning
of a particular measurement. The measurement type identifies what a particular
measurement represents, such as PERCENTUSED for the amount of disk space that
is used on a particular component. For each measurement type there are many
measurements recorded. Measurement types remain the same across different
components, while the measurements themselves are related to only one component.
-
mechanism
- (1) A specific algorithm or
operation (such as a queueing discipline) that is implemented in a node to
realize a set of one or more per-hop behaviors.
- (2) A pattern that
provides a common solution to a common problem in a given context.
-
media
- (1) In Backup, Recovery, and Media
Services, physical tape cartridges, tape reels, or removable storage devices
available for use by the system. This media is grouped into media classes
for management, tracking, and statistical analysis.
- (2) Magnetic disks,
magnetic tapes, compact discs (CDs), and digital video disks (DVDs).
-
Media Access Control (MAC)
- In networking,
the lower of two sublayers of the Open Systems Interconnection model data
link layer. The MAC sublayer handles access to shared media, such as whether
token passing or contention will be used. See also LAN emulation, Logical Link Control.
-
Media Access Control address (MAC address)
- A hardware address that uniquely identifies each node of a network.
On a local area network (LAN), the MAC address is the unique hardware number
of a computer's network adapter card.
-
Media Access Control protocol (MAC protocol)
- In a local area network, the protocol that determines which device
has access to the transmission medium at a given time.
-
media access method
- The method for
determining which device has access to the transmission medium at any time.
-
media archiver
- A physical device
that is used for storing audio and video stream data. The VideoCharger is
a type of media archiver. See also storage system.
-
media class
- In Backup, Recovery,
and Media Services, a user-defined name used to identify the type and characteristics
of the physical media to be managed as a group for backup, archive, or recovery
operations. Each media class is distinguished by attributes, such as format
or capacity, that are used by the system.
-
media descriptor
- The XML description
that identifies the location of files that are defined in an installable unit
deployment descriptor (IUDD). See also artifact, bound file, descriptor.
-
media format
- The type of volume,
recording format, and techniques used to create the data on the volume.
-
media image
- In WebSphere MQ on UNIX
systems and WebSphere MQ for Windows, the sequence of log records that contain
an image of an object. The object can be re-created from this image.
-
media inventory
- In Backup, Recovery,
and Media Services, a library that contains information about media that has
been enrolled in Backup, Recovery, and Media Services. The media inventory
contains information such as volume serial identifier, expiration date, creation
date, and location. Media in the media inventory is used for backup, archive,
and recovery operations.
-
medialess
- Pertaining to a personal
computer or workstation that does not have a diskette or tape drive or a hard
disk.
-
medialess programmable workstation
- A programmable workstation that does not contain a diskette or tape drive
or a hard disk. Cooperative processing is done through a shared folder on
the server.
-
media library device (MLD)
- A tape
storage device that contains one or more tape drives, tape cartridges, and
a part (carriage and picker assembly) for moving tape media between the cartridge
storage slots and the tape drives.
-
media management
- In Backup, Recovery,
and Media Services, the overall control, cataloging, and tracking of removable
media by status, storage location, container placement, and contents by volume
from creation to expiration. Backup, Recovery, and Media Services tracks only
enrolled volumes. Tapes and other media are managed by media class and individual
volumes within the class. Both active and expired media are tracked by volume
serial number.
-
media management system
- A program
that assists in managing removable media. DFSMSrmm is an example of a media
management system.
-
media origin
- (1) One of the four corners
of the physical medium (usually paper) where printing begins.
- (2) The first hardware addressable point on the physical sheet.
- (3) The
reference point from which the logical page origin is positioned by the medium
map. This point is represented by Xm=0, Ym=0 in the Xm, Ym coordinate system.
The media origin is defined relative to the top-left corner of the form. See
also logical page origin.
-
media policy
- In Backup, Recovery,
and Media Services, a policy that defines the default values used for management
of a media class. A user can have multiple media policies (one for each media
class) to define such things as the move policy used for this media class,
the type of retention, the use of save files, and the number of copies to
be made. Values for a media policy are inherited from the system policy and
can be overridden by the media policy or by the user at the control group
level.
-
media pool
- In Backup, Recovery, and
Media Services, a grouping of media by similar characteristics such as by
tape density or tape capacity. A media pool is used to help track media and
protect the active data on the media. Synonymous with media class.
-
media server
- An AIX-based component
of the Content Manager system that is used for storing and accessing video
files.
-
media set
- (1) In Backup, Recovery, and
Media Services, a multivolume tape group created as a result of a backup operation
or archive operation. Media sets are managed as a group to provide consistent
management of single and multivolume output and to provide integrity in cases
where an individual volume in a media set is expired in advance of the remaining
volumes.
- (2) In software distribution and installation, a multivolume
CD-ROM, CD-R, or tape group created for the purpose of distributing a selection
of software to customers for installation on to the system. Some media sets,
for example, a system software release upgrade media set, may consist of a
collection of smaller media sets, each containing a specialized selection
of the Licensed Internal Code, licensed programs, the operating system, and
program temporary fixes needed to operate the system and use it to do business.
-
mediation
- An application of service
interaction logic to messages flowing between service requesters and providers.
-
mediation flow
- A sequence of processing
steps, or mediation primitives, that run to produce the mediation when a message
is received.
-
mediation flow component
- A component
that contains one or more mediation primitives arranged into request and response
flows. Rather than performing business functions, mediation flow components
are concerned with the flow of messages.
-
mediation module
- An SCA module that
includes a mediation flow component and primarily enables communication between
applications by changing the format, content, or target of service requests.
-
mediation primitive
- A basic interface
or programming element that can be used to build mediation flow components.
Mediation primitives accept messages and process them by performing actions
such as routing or transforming. Mediation primitives are connected together
to run the logic of a mediation flow.
-
mediation service
- A service that
intercepts and modifies messages that are passed between client services (requesters)
and provider services.
-
Medical Subject Headings (MeSH)
- The U.S. National Library of Medicine's controlled vocabulary thesaurus. It
consists of sets of terms naming descriptors in a hierarchical structure that
permits searching at various levels of specificity.
-
medium
- The material on which computer
information is stored. Examples of media are diskettes, CDs, and tape.
-
Medium Access Control (MAC)
- See Media Access Control.
-
medium access control sublayer (MAC sublayer)
- One of two sublayers of the ISO Open Systems Interconnection
data link layer proposed for local area networks by the IEEE Project 802 Committee
on Local Area Networks and the European Computer Manufacturers Association
(ECMA). It provides functions that depend on the topology of the network and
uses services of the physical layer to provide services to the logical link
control (LLC) sublayer. The OSI data link layer corresponds to the SNA data
link control layer.
-
medium attachment unit
- See transceiver.
-
medium map
- An internal object in
a form definition or a print data set that controls such items as modifications
to a form, page placement, and overlays.
-
medium name
- In DFSMSrmm, a value
of up to eight characters that describes the type and shape of removable media
located in a storage site.
-
medium overlay
- An electronic overlay
that is invoked by the medium map of a form definition for printing at a fixed
position on the form. See also floating overlay.
-
meeting
- A virtual gathering of two
or more people to do work. It can include, but is not limited to, chat, IP
audio/video, screen sharing, shared whiteboard, or telephone conference calls.
-
meeting service
- A data-sharing service
that supports screen sharing and the shared whiteboard.
-
meeting status
- The current status
of an online meeting as displayed in the list of meetings. The status could
be active, scheduled, or finished. See also active
meeting, scheduled meeting.
-
meet-in-the-middle mapping
- An approach
for mapping enterprise beans to database tables in which enterprise beans
and database schema are created simultaneously but independently.
-
megabit (Mb)
- For processor storage,
real and virtual storage, and channel volume, 2 to the power of 20 or 1 048
576 bits. For disk storage capacity and communications volume, 1 000 000 bits.
-
megabits per second (Mbps)
- See also
kilobits per second.
-
megabyte (MB)
- For processor storage,
real and virtual storage, and channel volume, 2 to the 20th power or 1 048
576 bytes. For disk storage capacity and communications volume, 1 000 000
bytes.
-
megahertz (MHz)
- A unit of measure
of frequency. One megahertz equals 1 000 000 hertz.
-
member
- (1) In i5/OS, one of several different
sets of data, each with the same format, within one database file.
- (2) A data object in a structure, a union, or a library.
- (3) A C++
data object or function in a structure, union or class. Members can also be
classes, enumerations, bit fields and type names.
- (4) A partition
of a partitioned data set (PDS) or partitioned data set extended (PDSE).
- (5) A person, group, or organization known to the system. A member can be
a user, an organization, an organization unit, or a member group.
- (6) A specific function of a multisystem application that is defined to the cross-system
coupling facility (XCF) and assigned to a group by the multisystem application.
A member residing on one system in a sysplex can use XCF services to communicate
with other members of the sysplex.
- (7) In multidimensional clustering,
the element of a dimension. See also dimension.
-
member function
- A C++ operator or
function that is declared as a member of a class. A member function has access
to the private and protected data members and member functions of an object
of its class. Member functions are also called methods.
-
member group
- A group that is used
to implement role-based control in WebSphere Commerce. A customer group is
for general use, while an access group is for access control purposes.
-
member ID
- The member name of a resource
object minus the 2-character prefix. For example, BITR is the member ID of
the font whose member name is X1BITR.
-
member name
- (1) The z/OS XCF identifier
for a particular DB2 for z/OS subsystem in a data sharing group.
- (2) In AFP, the name under which a file is stored in a library. For example X1S0BITR
is the member name of a font in the font library.
-
membership
- The state of being a portal
user and a place member. Membership in the portal is controlled by the administrator
during the installation and set up of portal servers. Membership in places
is controlled by a place manager, who determines the level of access for each
place member: participant, place designer, or place manager.
-
membership policy
- A subexpression
that is evaluated against the nodes in a cell to determine which nodes host
dynamic cluster instances.
-
memory
- Program-addressable storage
from which instructions and other data can be loaded directly into registers
for subsequent running or processing. See also auxiliary
storage.
-
memory affinity
- A feature available
in AIX to allocate memory attached to the same multiple chip module (MCM)
on which the process runs. Memory affinity improves the performance of applications
on IBM System p servers.
-
memory leak
- The effect of a program
that maintains references to objects that are no longer required and therefore
need to be reclaimed.
-
memory pool
- A logical division of
memory (storage) that is reserved for processing a job or group of jobs. Synonymous
with main storage pool.
-
MEMS
- See Micro-Electric
Mechanical System.
-
menu
- A displayed list of items from
which a user can make a selection.
-
menu bar
- (1) The area near the top of
a window, below the title bar and above the rest of the window, that contains
choices that provide access to other menus.
- (2) In the AIX operating
system, a rectangular area at the top of the client area of a window that
contains the titles of the standard pull-down menus for that application.
-
menu bar field
- In DDS, a panel element
that contains a numeric field containing one or more menu-bar choice keywords.
-
menu bar separator
- In DDS, a panel
element that contains a horizontal line that appears directly below a menu
bar.
-
menu bar switch key
- A key that alternates
the cursor between the menu bar and that application display.
-
menu file
- A text file that contains
specific syntax to add menu items to any menu.
-
menu security
- A function of the operating
system that controls which system resources are available to users. Menu security
restricts a user to a single menu or a sequence of menus that are defined
in the user profile.
-
merchandising association
- An association
between two catalog items for the purpose of a sales activity. For example,
a camera might have a "requires" merchandising association with a set of batteries,
and a dictionary might have a "goes with" merchandising association with a
thesaurus. See also accessory.
-
merge
- (1) To insert records throughout
a single output file.
- (2) To combine overrides for a file from the
first call level up to and including a greater call level, producing the override
to be applied when the file is used.
- (3) To update and insert new
content into a table.
- (4) A process element that recombines multiple
processing paths, usually after a decision. A merge brings several alternative
paths together.
-
merged model
- A model that contains
the resolved differences and conflicts after a merge session.
-
merge file
- In COBOL, the temporary
file that contains all the records to be merged by a MERGE statement. The
merge file is created and can be used only by the merge function.
-
merge session
- In version control
software, the forum in which conflicting versions of a contributor are resolved
and combined.
-
MERVA for ESA
- An IBM licensed program
that is a message queuing and routing system that allows a financial institution
to process all kinds of financial messages. Access to the SWIFT Transport
Network (STN) is included as a standard communication link.
-
MERVA Link
- A MERVA component that
can be used to interconnect several MERVA systems.
-
MES
- See miscellaneous
equipment specification.
-
MeSH
- See Medical
Subject Headings.
-
mesh-connected session network
- A
configuration where every network node has a control point-to-control point
session to every other network node. As the number of network nodes increases,
the number of CP-to-CP sessions increases dramatically.
-
message
- (1) A communication sent from
a person or program to another person or program.
- (2) In OSI Message
Services, a piece of electronic mail in the format of the X.400 CCITT standard.
An X.400 message can be a document, note, message, or file.
- (3) An
assembly of characters and sometimes control codes that is transferred as
an entity from an originator to one or more recipients. A message consists
of two parts: envelope and content.
- (4) A formatted transfer unit
used to exchange control or payment information.
- (5) In system programming,
information intended for the terminal operator or system administrator.
- (6) A set of data that is passed from one application to another. A message
can be modeled by a message definition, which describes the structure and
content of the message. Messages must have a structure and format that is
agreed by the sending and receiving applications. See also category.
- (7) In UML modeling, a model element that defines a
specific kind of communication between participants (roles or objects) in
an interaction.
-
message area
- In BMS, the area of
a screen used to send instruction messages to assist the operator in processing
a transaction. This area should be separate from the application data area
to allow communication with the operator, without disturbing the application
data. The message area is normally the bottom one or two lines of the screen.
-
message authentication code (MAC)
- (1) In Cryptographic Support, the first 4 bytes from the last 8-byte block of
ciphertext produced when encrypting a message using cipher block chaining,
that is added to the end of the plaintext message from which it was created
and used to detect whether the message was changed during transmission.
- (2) In computer security, a value that is a part of a message or accompanies
a message and is used to determine that the contents, origin, author, or other
attributes of all or part of the message are as they appear to be.
-
message authentication key
- In Cryptographic
Support, a data encrypting key used to encrypt data to produce a message authentication
code.
-
message backout table (MBO)
- In the
restart data set, a summary table that contains an entry for each terminal
for which logged or journaled message or message resynchronization records
were written to the restart data set. Data in this table is available to user-written
exit programs.
-
message body
- The part of the message
that contains the message payload. See also message
header.
-
message box
- A secondary window that
displays a message about a particular situation or condition.
-
message broker
- See broker.
-
message cache
- A temporary storage
queue with a DATAID of DFHMxxxx, where xxxx is the identification of a logical
unit, into which CICS reads messages (for message-protected tasks only) during
emergency restart. A user-written enquiry program run after emergency restart
can read the contents of message caches. CICS does not read or purge message
caches.
-
message category
- A group of messages
that are logically related within an application.
-
Message Center
- An IBM product that
uses DirectTalk's voice processing capabilities to provide a wide range of
voice mail, fax, and e-mail functions.
-
message channel
- In distributed message
queuing, a mechanism for moving messages from one queue manager to another.
A message channel comprises two message channel agents (a sender at one end
and a receiver at the other end) and a communication link.
-
message channel agent (MCA)
- A program
that transmits prepared messages from a transmission queue to a communication
link, or from a communication link to a destination queue. See also Message Queue Interface.
-
message channel interface (MCI)
- The WebSphere MQ interface to which customer- or vendor-written programs that
transmit messages between a WebSphere MQ queue manager and another messaging
system must conform. A part of the WebSphere MQ Framework.
-
message class
- A class, assigned to
a transaction code, that determines within which message region an application
program is to process that transaction. See also class, region class, transaction
class.
-
message context
- Information about
the originator of a message that is held in fields in the message descriptor.
There are two categories of context information: identity context and origin
context.
-
message control block (MCB)
- The definition
of a message, screen panel, net format, or printer layout made during customization
of MERVA.
-
Message Control Information
- The part
of the OTMA message prefix that contains such information as the transaction
pipe name and the message type. It is not contiguous with the rest of the
message prefix and it must be specified for every OTMA message.
-
message data set
- (1) A data set on disk
storage that contains queues of messages awaiting transmission to particular
terminal operators or to the host system.
- (2) In PSF, a virtual data
set built by the library access system interface (LASI) subcomponent in memory
to store error messages for printing at the end of the document.
- (3) The message data set is used principally to pass messages about the current
state of specific resources from the active system to the alternate system.
It is also used for the secondary surveillance signals of the active, alternate,
or both CICS systems, when the control data set is unavailable for this purpose,
either because the last write has not completed yet or because of I/O errors.
-
message definition
- A logical description
of a message. A message definition is a structured collection of simple elements.
-
message definition file
- A file that
contains the messages, elements, types, and groups that make up a message
set.
-
message delete option
- An option that
may be defined to prevent nonessential messages from being sent to a specific
terminal.
-
message delivery preference
- The subscriber's
choice of whether voice mail is stored as voice mail only, as e-mail only,
or as both voice mail and e-mail.
-
message delivery type
- The format
in which a voice message is delivered.
-
message descriptor
- Control information
describing the message format and presentation that is carried as part of
a WebSphere MQ message. The format of the message descriptor is defined by
the MQMD structure.
-
message destination
- A destination
that is a transaction, an LTERM, an MSNAME, or a command.
-
message dictionary
- A data structure
that describes all the messages in a message set in a form suitable for deployment
to a broker.
-
message digest
- A hash value or a
string of bits resulting from the conversion of processing data to a number.
-
message domain
- (1) A grouping of messages
that share certain characteristics. A message domain has an associated parser
that interprets messages that are received and generated by a broker. WebSphere
Business Integration Message Broker supports messages in the BLOB domain,
JMS domain, MRM domain, and XML domain. User-defined parsers can be used to
support messages that do not conform to the supported domains.
- (2) Major component of CICS. It is a repository for CICS messages and it handles
the sending of messages to transient data destinations or to the console.
It also provides an interface for returning the text of a message to the caller.
-
message-driven bean (MDB)
- An enterprise
bean that provides asynchronous message support and clearly separates message
and business processing.
-
message-driven program
- An application
program that is initiated by the scheduling of an input message. The types
of message-driven programs are MPP, IFP, and JMP. See also non-message-driven program.
-
message editing
- The process by which
messages are formatted for presentation to an application program or terminal.
Additional message editing routines may be written by the user. See also basic edit.
-
message envelope
- The information
associated with a message aside from attachments and recipients.
-
message exit
- A type of channel exit
program that is used to modify the contents of a message. Message exits usually
work in pairs, one at each end of a channel. At the sending end of a channel,
a message exit is called after the message channel agent (MCA) has got a message
from the transmission queue. At the receiving end of a channel, a message
exit is called before the message channel agent (MCA) puts a message on its
destination queue.
-
message field (MFLD)
- In MFS, the
smallest area in a message input or output descriptor whose content and structure
are defined by the user.
-
message file
- (1) An object that contains
message descriptions. The system-recognized identifier for the object type
is *MSGF.
- (2) In CICS, the file holding the text of all CICS messages.
- (3) A file containing messages sent in bulk through a message bulking
service.
-
message flood condition
- A condition
in which the number of incoming messages that are waiting to be processed
by OTMA threatens IMS performance or rises above acceptable limits. A message
flood condition occurs when too many transactions are waiting to be processed
by OTMA, and can deplete all available local system queue area (LSQA) storage
and result in a z/OS abend.
-
message flow
- A sequence of processing
steps that execute in the broker when an input message is received. Message
flows are defined in the workbench by including a number of message flow nodes,
each of which represents a set of actions that define a processing step. The
connections in the flow determine which processing steps are carried out,
in which order, and under which conditions. See also message broker, subflow.
-
message flow control
- A distributed
queue management task that involves setting up and maintaining message routes
between queue managers.
-
message flow node
- A processing step
in a message flow. A message flow node can be either a built-in node, a user-defined
node, or a subflow node. See also node.
-
message flow node connection
- An entity
that connects the output terminal of one message flow node to the input terminal
of another. A message flow node connection represents the flow of control
and data between two message flow nodes.
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Message Format Service (MFS)
- (1) An editing
facility that allows application programs to deal with simple logical messages
instead of device-dependent data, thus simplifying the application development
process.
- (2) A MERVA direct service that formats a message according
to the medium to be used, and checks it for formal correctness.
-
Message Format Service control block (MFS control
block)
- In MFS, the representation of a message or format that
is stored in the IMS.FORMAT library and called into the MFS buffer pool as
needed for online execution.
-
message group
- A group of logical
messages. Logical grouping of messages allows applications to group messages
that are similar and to ensure the sequence of the messages.
-
message handling system (MHS)
- In
OSI X.400, a collection of message transfer agents and user agents that provide
support for sending and receiving messages.
-
message header
- The part of a message
that specifies the sender and receiver of the message, the message priority,
and the type of message. See also message body.
-
message help
- More information about
a message, such as the message type, severity, and date and time sent.
-
message ID
- See message identifier.
-
message identifier (message ID)
- (1) A 7-character code that identifies a predefined message, and is used to get
the message description from a message file.
- (2) A tag attached to
a message that uniquely identifies that message across all IBM products.
-
message input descriptor (MID)
- The
MFS control block that describes the format of the data presented to the application
program. See also message output descriptor.
-
Message Integrity Protocol (MIP)
- In MERVA Link, the protocol that controls the exchange of messages between
partner ASPs. This protocol ensures that any loss of a message is detected
and reported, and that no message is duplicated despite system failures at
any point during the transfer process.
-
message line
- An area on the display
where messages are displayed.
-
message log
- A file in which an application
logs messages about errors that occur or metadata about the message.
-
message mode
- A transaction attribute
that describes how the transaction is handled by the application program.
See also multiple message mode, single message mode.
-
message model
- A definition of a message
format that is used by applications. Message models are defined in the workbench.
-
message object
- An abstraction of
the data structures or system objects that store mail server framework message
information.
-
message output descriptor (MOD)
- The MFS control block that describes the format of the output data produced
by the application program. See also message input
descriptor.
-
message parser
- A program that interprets
the bit stream of an incoming message and creates an internal representation
of the message in a tree structure, and that regenerates a bit stream for
an outgoing message from the internal representation.
-
Message Passing Interface (MPI)
- A library specification for message passing. MPI is a standard application
programming interface (API) that can be used with parallel applications and
that uses the best features of a number of existing message-passing systems.
-
message performance option
- The improvement
of ISC performance by eliminating syncpoint coordination between the connected
systems.
-
message prefix
- Each message in IMS
contains a message prefix. This is a structured set of areas that define information
needed for processing each message. Some parts of the message prefix always
exist, while others are only included if the IMS system is defined with a
particular function.
-
message priority
- In WebSphere MQ,
an attribute of a message that can affect the order in which messages on a
queue are retrieved, and whether a trigger event is generated.
-
message-processing function
- The various
parts of MERVA used to handle a step in the message-processing route, together
with any necessary equipment.
-
message processing node
- (1) A node in
a message flow that represents a processing step. A message processing node
can be either a primitive or a subflow node.
- (2) See message flow node.
-
message processing program (MPP)
- (1) A program that processes or otherwise responds to messages received from terminals.
- (2) An IMS application program that is driven by transactions and
has access to online IMS databases and message queues. See also batch processing program.
-
message processing unit
- A message
processing unit is used to correlate information within a message, for example
reason or completion information, and a message text.
-
message protection
- A recovery and
restart function provided by CICS. It logs input and output messages for VTAM
terminals and enables the m
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