H

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.
[[ Contents Previous Page | Next Page Index ]]