High waits for CSS group membership query in RAC Database

(Doc ID 1622624.1)

Last updated on NOVEMBER 01, 2017

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2]
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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