1978739 - Sudden changes in procedure cache, "number of open objects", CPU usages with no changes to the processes running - SAP ASE | SAP Knowledge Base Article

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1978739 - Sudden changes in procedure cache, "number of open objects", CPU usages with no changes to the processes running - SAP ASE

Symptom

The following symptoms are known to appear without any changes to processes that are running in ASE Server 15.0.3 or higher:

  • There are no new processes and nothing shows up in the montable.
  • Output of sp_sysmon shows server engine utilization goes up ( over 90%).
  • System may report high CPU even if trace flag 753 at server level is enabled (used to disable large allocation auto tune in memory manager).
  • sp_monitorconfig shows procedure cache utilization goes down and reuse count (which was 0) goes up.
  • Object Manager Spinlock Contention in the sp_sysmon output is also high (above 3%).
  • Metadata parameters such as "number of open objects" can be seen as very high usage.

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Environment

SAP Adaptive Server Enterprise (ASE) 15.0.3 and above.

Product

SAP Adaptive Server Enterprise 15.7 ; SAP Adaptive Server Enterprise 16.0 ; Sybase Adaptive Server Enterprise 15.0 ; Sybase Adaptive Server Enterprise 15.5

Keywords

TF, TraceFlag, open objects, performance, proc_cache, free_unused, high cpu usage, spinlock, contention , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Problem

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