HSSAVE

HSSAVE

Controls how often the DIV data set pages are updated when a DIV data set backs a hiperspace library

Default: HSSAVE

Valid in: configuration file, SAS invocation, OPTIONS statement, OPTIONS window

Category: File Control: SASFILES

OS/390 specifics: all

Syntax
Details
See Also

Syntax

HSSAVE | NOHSSAVE

HSSAVE: specifies that the DIV data set pages are updated every time SAS writes to the hiperspace.
NOHSSAVE: specifies that the DIV data set pages are updated only when the library is closed. A SAS data library is closed when you clear the library specification or when you end your SAS session.

Details

Note: DIV data sets are also referred to as VSAM linear data sets. [cautionend]

The HSSAVE default provides the best protection from data loss during programming. During execution of tested programs, you may wish to improve performance by specifying NOHSSAVE. The performance improvement results from a decrease in the number of I/O operations to the DIV data set. However, you should not specify NOHSSAVE unless you are willing to risk losing changes. You may lose changes if the library is not closed before a job terminates abnormally.

See Also

Optimizing I/O
Tuning SAS Applications in the MVS Environment, by Michael Raithel

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Default:	HSSAVE
Valid in:	configuration file, SAS invocation, OPTIONS statement, OPTIONS window
Category:	File Control: SASFILES
OS/390 specifics:	all