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ORA-600[qesmmCChgWAReq2] Generated by a JOIN Query (Doc ID 2359255.1)

Last updated on OCTOBER 09, 2023

Applies to:

Gen 1 Exadata Cloud at Customer (Oracle Exadata Database 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
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.


A complex query with a JOIN for multiple tables fails with an ORA-600[qesmmCChgWAReq2] error.


The Call Stack Trace in the associated incident trace file shows:


-  Changing the query to use UNION instead of JOIN does not generate the error.

-  Each session that raises the error has this in common:

     session cursor with flag FETCH=1;

   This means that the query is blocked on retrieving data from an INDEX.

-  Analyzing the tables to check for table/index mismatches and/or corruptions (i.e. analyze table ... validate structure cascade;) doesn't raise any error, but hangs.

-  Rebuilding online the indexes of the tables involved does not resolve the problem.





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