- handler
- In the CICS/ESA Front End Programming Interface (FEPI), a transaction
initiated to handle specified events.
- hardware
- The physical components
of a computer system. See also software.
- HDAM
- See hierarchic direct access method (HDAM).
- heuristic decision
- A decision to
force a commit or rollback of a logical unit of work in part of a transaction
program network that is using the two-phase commit protocol, made when a system
or communications failure prevents normal completion of the logical unit of
work.
- HFS
- See hierarchical file system (HFS).
- HIDAM
- See hierarchic indexed direct access method (HIDAM).
- hierarchical file system (HFS)
- A system for organizing files in
a hierarchy, as in a UNIX system. OS/390 UNIX System Services files are organized
in an HFS.
- hierarchic database
- A database organized in the form of a tree
structure that predetermines the access paths to data stored in the data base.
DL/I, IMS, and SQL/DS are hierarchic database managers. See also relational database.
- hierarchic direct access method (HDAM)
- In DL/I, IMS, or SQL/DS,
a database access method using algorithmic addressability to records in a
hierarchic direct organization.
- hierarchic
indexed direct access method (HIDAM)
- In DL/I, IMS, or SQL/DS,
a database access method using indexed access to records in a hierarchic sequential
organization.
- hierarchic sequential access method (HSAM)
- In DL/I, IMS, or SQL/DS,
a database access method used for sequential storage and retrieval of segments
on tape or direct access storage.
- hierarchy
- The tree-like
arrangement of segments in a database, beginning with the root segment and
proceeding down to dependent segments. No segment type can be dependent on
more than one other segment type.
- high-level
assembler language (HLAS)
- One of the programming languages in
which applications for CICS/VSE can be coded.
- high-level language (HLL)
- A programming language that does not reflect the structure of
any particular computer or operating system.
- high performance
option (HPO)
- An option provided with MVS to improve performance
by reducing the transaction pathlength; that is, the number of instructions
needed to service each request.
- high private area
- Part
of the CICS address space, consisting of the local system queue area (LSQA),
the scheduler work area (SWA), and subpools 229 and 230. The area at the high
end of the CICS address space is not specifically used by CICS, but contains
information and control blocks that are needed by the operating system to
support the region and its requirements. See The CICS
private area for more information.
- high
speed sequential processing (HSSP)
- An IBM/ESA version 3 facility,
available only to batch message programs, for optimizing the sequential processing
of DEDB areas. A simultaneous image copy can also be created.
- hiperspace
- A high-performance storage area in the processor or multiprocessor.
- history log data set
- A sequential data set in which all SMP/E
actions are recorded. Each zone has its own SMPLOG data set.
- HLAS
- See high-level assembler language (HLAS).
- HLL
- See high-level language.
- host
- A computer
that is connected to a network and provides an access point to that network.
The host can be a client, a server, or both a client and server simultaneously.
See also server, client.
- host computer
- The primary or controlling computer in a data communication system.
- host processor
- The primary or controlling computer
in a multiple computer installation.
- HPO
- See high performance option (HPO).
- HSAM
- See hierarchic sequential access method (HSAM).
- HSSP
- See high speed sequential processing (HSSP).
- hyperlink
- A direct connection between the data in one CICSPlex
SM view and a view containing related information. For example, from a view
that lists multiple CICS resources, there may be a hyperlink to a detailed
view for one of the resources. To use a hyperlink, place the cursor in the
data portion of a hyperlink field and press Enter.
- hyperlink field
- On a CICSPlex SM view, a field for which a hyperlink is defined.
headings of hyperlink fields are shown in high intensity or color, depending
on the terminal type.
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