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Compression Advisor still Generates Redo Log on (Doc ID 1324598.1)

Last updated on FEBRUARY 25, 2019

Applies to:

Oracle Database - Enterprise Edition - Version and later
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 Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.


Lots of redo log information is generated by Compression advisor creating internal table DBMS_TABCOMP_TEMP_UNCMP.

The DDL generating redo log is:

SQL>CREATE TABLE <owner>.dbms_tabcomp_temp_uncmp
TABLESPACE <tablespace>
SELECT /*+ FULL(<owner>.<table>) */
FROM <owner>.<table> SAMPLE BLOCK (99) mytab


The source table has a lob and the segment associated to this lob has CACHE LOGGING setting:



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