Unrecoverable Changes reported in v$datafile for User tablespace datafiles due to Internal Compression Advisor tables (Doc ID 2233391.1)

Last updated on FEBRUARY 16, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Information in this document applies to any platform.

Symptoms

 Application related tablespace all have Logging attributes set at segment level.
 
 Database doesnot have  Force logging mode enabled, However there are No nologging operations like Append with Parallel hint,Direct load are done through Application.

 V$datafile shows Unrecoverable_change# and Unrecoverable_time for user tablespace datafiles.

 Object involved has a name starting with CMP example :- CMP4$225  etc

 Where the last two digits indicates the Object id of the for  which this compression table was created

 

Cause

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