H

header

The first entry on each page of the database. The header is 16 to 28 bytes long and contains the page number and other information about a given page.

header area

The portion of a pageable map that is located across the top of the screen. Fields in the header area are displayed whenever the map is displayed.

health check

A program or routine that identifies potential problems before they cause issues or outages. Checks can analyze changes in settings, threshold levels, single points of failure, or unhealthy combinations of configurations.

heartbeat

A system status message that CA IDMS sends to CA OPS/MVS System State Manager at regular intervals to indicate that CA IDMS is “alive”. This status can be forwarded to other Common Service components to simplify system automation.

help facility

The facility of the DC/UCF online Mapping Facility that allows field and map level help to be associated with a map. For maps with this system-defined help, help text is displayed when the help key defined for the map is pressed, transparent to the application program or dialog displaying the map.

help load module

In the online mapping facility of DC/UCF, a load module created by MAPC or RHDCMPUT that includes the text of help messages to be displayed when the help key defined for the map is pressed by the user. See also help facility, field level help, map level help.

home page

The first page on which CA IDMS/DB stores an entire record or the root portion of a variable-length record.

host node

In a DC/UCF communications network, the DC/UCF system acting as the front end. See also front end, server node, target node.

host teleprocessing monitor

The teleprocessing (TP) monitor that serves as the CA IDMS UCF front end. The CA IDMS UCF front-end program executes as an application under the host TP monitor.

host variable

A program variable that is referenced in an SQL statement. Host variables are used to receive data retrieved from the database and to supply data to be added to the database.

host variable array

An array of host variables for use in bulk processing.

hot backup

The process of backing up the database while the database area(s) are being updated.