Large Queries are Hanging in State 'Statistics' on High Load with Large Query Cache (Doc ID 1992697.1)

Last updated on DECEMBER 29, 2016

Applies to:

MySQL Server - Version 5.1 and later
Information in this document applies to any platform.

Symptoms

  1. Busy server.
  2. Processlist shows queries spending much time in 'statistics' state (especially large queries involving many tables/columns/conditions/etc).
  3. Parameter query_cache_size is configured to large value (typically bigger than 128Mb)
  4. Sometimes high ratio in status variables Qcache_lowmem_prunes / Uptime may be observed.

Cause

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