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Managing sort performance

You can allocate sort work space by using JCL, or you can dynamically allocate it by using the BMC AMI Recover SORTNUM option. In either case, if a sort size is not passed to the sort routine, the sort routine may not use all of the requested space. When an estimated or exact sort size is specified, the sort routine uses an optimal algorithm.

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LOGSORT-specification

R+/CHANGE ACCUM cannot determine the exact size of the sort because the log records are sorted as they are extracted from the log files.

The NUMREC and AVGRECSZ options that are provided with R+/CHANGE ACCUM allow you to specify sort sizes. You can use NUMREC to specify the estimated number of records to pass to the sort routine, or R+/CHANGE ACCUM can provide the estimate.

If you specify or use the CALC option implicitly, R+/CHANGE ACCUM can estimate the number of sort records. It estimates one log record per control interval.

 

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R+/CHANGE ACCUM 13.1