High waits for CSS group membership query in RAC Database (Doc ID 1622624.1)

Last updated on OCTOBER 30, 2014

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.3 to 11.2.0.3 [Release 11.2]
Information in this document applies to any platform.

Symptoms

RAC instances experience high waits for CSS group membership query.

LCK0 background process is waiting for CSS group membership query and there can also be many processes waiting for rdbms ipc timeout

 

Changes

In some cases Parallel Query is involved.

Cause

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