G

garbage collection
Part of a language's run-time system or an add-on library that automatically determines the memory that a program no longer uses, and recycles it for other use. Garbage collection may be assisted by the compiler, the hardware, the operating system, or any combination of the three.
GDDM
See Graphical Data Display Manager (GDDM)
GDS
See generalized data stream (GDS)
generalized data stream (GDS)
The SNA-defined data stream format used for basic conversation on APPC sessions.
Generalized Performance Analysis Reporting (GPAR)
A tool designed as a base for reporting on the performance of IBM or user-written programs.
generalized sequential access method (GSAM)
In IMS, an access method that supports simple physical sequential data sets, for example, SYSIN, SYSOUT, and tape files.
generalized trace facility (GTF)
In MVS, a trace data-collection routine.
general log
A general purpose log stream used by CICS for any of the following: forward recovery logs, autojournals, or user journals. See also system log.
general resource
In RACF, any system resource, other than an MVS data set, that is defined in the class descriptor table (CDT). On MVS, general resources include DASD volumes, tape volumes, load modules, terminals, IMS; and CICS transactions and other CICS resources, and installation-defined resource classes. See also class.
generate
To produce a computer program by selection of subsets from skeletal code under the control of parameters.
generation feature
In CICS/VSE, an IBM licensed program order option used to tailor the object code of a program to user requirements.
generic alert
A Systems Network Architecture (SNA) Network Management Vector that enables a product to signal a problem to the network. CICSPlex SM uses generic alerts as part of its interface to NetView.
generic applid
In XRF, the name by which the active-alternate pair of CICS systems is known to the end user. In VTAM terms, this is the USERVAR. The generic name is also used in intersystem communication. See also specific applid and application identifier (VTAM applid).
generic data identifier
In CICS, a 1-to-8 character alphanumeric name consisting of the common leading characters of a group of temporary storage queue names for which recovery is required.
generic gate
Gives access to a set of functions that are provided by several domains.
generic key
In systems with VSAM, a leading portion of a key, containing characters that identify those records that are significant for a certain application. The key is one or more consecutive characters, taken from a data record, used to identify the record and establish its order with respect to other records.
generic profile
In RACF, a profile that can provide protection for one or more resources. The resources protected by a generic profile have similar names and identical security requirements. For example, a generic data set profile can protect one or more data sets. See also data set profile, discrete profile, resource profile.
GETVIS space
In CICS/VSE, storage space within a partition or the shared virtual area, available for dynamic allocation to programs.
GID
See group ID.
global access checking
In RACF, the ability to allow an installation to establish an in-storage table of default values for authorization levels for selected resources. RACF refers to this table prior to performing normal RACHECK processing, and grants the request without performing a RACHECK if the requested access authority does not exceed the global value. Global access checking can grant the user access to the resource, but it cannot deny access.
global catalog
A system data set in which CICS records CICS system information. See also local catalog.
global catalog domain
Together with the local catalog domain, a repository used by other CICS domains to hold information to allow an orderly restart. The two catalog domains enable CICS code to read, write, and purge records on the global and local catalog data sets so that a record of the CICS state can be maintained when CICS is not running.
global resource serialization (GRS)
A form of global data set enqueuing. In an XRF environment in which the active and alternate pair of CICS systems are running in different MVS images, GRS can be used (1) to enable the sharing of a CSD between the active and alternate (2) to reduce the risk of data integrity problems caused by concurrent execution of DB2 on the active and alternate.
global trap/trace exit
A problem-determination function controlled by the CSFE CICS transaction. See also timer and trace.
global user exit
A point in a CICS module at which CICS can pass control to a user-written program (known as an exit point program), and then resume control when the program has finished. When an exit program is enabled for a particular exit point, the program is called every time the exit point is reached. See also task-related user exit (TRUE).
global work area (GWA)
An area provided by CICS for a user exit program when the user exit program is enabled.
global zone
Logical division of the SMP/E consolidated software inventory (CSI).
goal mode
A workload management mode for an MVS image in a sysplex using an MVS workload management service definition to automatically and dynamically balance its system resources according to the active service policy for the sysplex.
GPAR
See Generalized Performance Analysis Reporting (GPAR).
Graphical Data Display Manager (GDDM)
A function of the operating system that processes both text and graphics for output on a display, printer, or plotter.
group
In RACF, a collection of users who can share access authorities for protected resources. In resource definition online, a collection of related resources. The main purpose of an RDO group is convenience in storing definitions in the CSD.
group authority
Authority to use objects, resources, or functions from a group profile.
group data set
On MVS, a RACF-protected data set in which either the high-level qualifier of the data set name or the qualifier supplied by an installation exit routine is a RACF group name. See also user data set.
group ID (GID)
In the Resource Access Control Facility (RACF), a string of one to eight characters that identifies a group. The first character must be A through Z, #, $, or @. The rest can be A through Z, #, $, @, or 0 through 9.
group profile
A profile that provides the same authority to a group of users.
group-related user attribute
In RACF, a user attribute assigned at the group level, that allows the user to control the resource, group, and user profiles associated with the group and its subgroups.
group terminal option
In RACF, a function that allows users within a group to log on only from those terminals that they have been specifically authorized to use.
GRS
See global resource serialization (GRS).
GSAM
See generalized sequential access method (GSAM).
GTF
See generalized trace facility (GTF).
GWA
See global work area (GWA).
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