Interpreting LSRpool statistics

CICS® supports the use of up to eight LSRpools. CICS produces two sets of statistics for LSRpool activity: one set detailing the activity for each LSRpool, and one set giving details for each file associated with an LSRpool. Statistics are printed for all pools that have been built (a pool is built when at least one file using the pool has been opened).

You should usually aim to have no requests that waited for a string. If you do then the use of MXT may be more effective.

When the last open file in an LSRpool is closed, the pool is deleted. The subsequent unsolicited statistics (USS) LSRpool record written to SMF can be mapped by the DFHA08DS DSECT.

The fields relating to the size and characteristics of the pool (maximum key length, number of strings, number and size of buffers) may be those which you have specified for the pool, through resource definition online command DEFINE LSRPOOL. Alternatively, if some, or all, of the fields were not specified, the values of the unspecified fields are those calculated by CICS when the pool is built.

It is possible to change the LSRpool specification of a file when it is closed, but you must then consider the characteristics of the pool that the file is to share if the pool is already built, or the file open may fail. If the pool is not built and the pool characteristics are specified by you, take care that these are adequate for the file. If the pool is not built and CICS calculates all or some of the operands, it may build the pool creations of that pool. The statistics show all creations of the pool, so any changed characteristics are visible.

You should consider specifying separate data and index buffers if you have not already done so. This is especially true if index CI sizes are the same as data CI sizes.

You should also consider using Hiperspace™ buffers while retaining a reasonable number of address space buffers. Hiperspace buffers tend to give CPU savings of keeping data in memory, exploiting the relatively cheap expanded storage, while allowing central storage to be used more effectively.

For more information, see the CICS statistics tables in topic LSRpool statistics.

Related reference
Back to full list of statistics
Interpreting CICS statistics
Full listing and DFHSTUP reports for these statistics
LSRpool statistics
DFH0STAT reports for these statistics
LSRpools Report
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