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2348669 - Slow performance and statement cache spinlocks on ERP/ASE 157 SP137 and 160 SP02 PL04

Symptom

Your SAP system is running SAP ASE DBClient SP137 or DBClient SP02 PL04 - downloaded from SAP Service Marketplace BEFORE September 20, 2016.

You notice very slow and sluggish performance on the upgraded systems.
DBACockpit analysis and/or ASE Sybdiag System Monitoring (sp_sysmon) outputs reveal the following:

  • ASE engines are constantly pegged at 100% cpu_busy
  • very low cache hit ratio for statement cache
  • high number of spins for SSQLCACHE_SPIN (statement cache spinlock)
  • heavy spinlock activity in Statement Cache

Checking the contents of Statement Cache via dbcc prsqlcache, an uneven distribution of cache statements across the hash buckets is observed; with majority of statements placed in a single bucket.


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Environment

  • SAP Adaptive Server Enterprise (ASE) 15.7 for Business Suite
  • SAP Adaptive Server Enterprise (ASE) 16.0 for Business Suite

Product

SAP Adaptive Server Enterprise 15.7 ; SAP ERP 6.0

Keywords

SSQLCACHE_SPIN, contention, 100%, performance, slow, busy, engines , 800183 , KBA , BC-DB-SYB , Business Suite on Adaptive Server Enterprise , Problem

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