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Recommendations for a large number of concurrent sorts

BMC AMI Recover automatically checks the available memory in the system (total and in use) and estimates the amount of memory needed to do each sort.

If enough memory is available without impacting the system, BMC AMI Recover starts up to MAXKSORT and MAXLSORT sorts concurrently.

If not enough memory is available, BMC AMI Recover automatically reduces the values for MAXKSORT and MAXLSORT to the maximum number of sorts that can run concurrently with the available memory. BMC AMI Recover first reduces MAXLSORT as far as necessary until the value of MAXLSORT is 2. If too many sorts for available memory are still indicated, BMC AMI Recover then reduces MAXKSORT until a manageable number of sorts is reached.

BMC AMI Recover does not reduce MAXLSORT to favor MAXKSORT if no indexes are being rebuilt.

In almost all cases, BMC AMI Recover optimizes the number of sorts automatically.

In the rare case that too many sorts are running and performance is degrading, you can

  • Reduce the number of sorts by setting MAXKSORT

  • Control the amount of memory used by each sort using SMCORE

Note

You can set the SMCORE and MAXKSORT options in the $AFROPTS installation macro or you can code them in the OPTIONS statement in the SYSIN for each BMC AMI Recover job.


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