High waits for CSS group membership query in RAC Database
(Doc ID 1622624.1)
Last updated on FEBRUARY 19, 2019
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 to 188.8.131.52 [Release 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.
***Checked for relevance on 01-Nov-2017***
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
In some cases Parallel Query is involved.
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