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3415716 - Severe latch contention on concurrent writetext in VLDB - SAP ASE

Symptom

  • Heavy concurrent writetext operations cause stacking latch sleep, during scanning for free space.
  • It can take hours to clear or when happens, causing DBA to have to kill all spids.
  • When restarting at nearly the same load, the problem isn't seen.
  • Symptoms seen are:
    • Massive blocking due to latch sleep on server (1400 connections writing concurrently)
    • Attempt to kill did not reduce the process count in latch sleep for over 2 hours.
    • Server had to be shutdown to recover.


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Environment

SAP Adaptive Server Enterprise (ASE) 16.0

Product

SAP Adaptive Server Enterprise 16.0

Keywords

KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Known Error

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