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Compression Advisor still Generates Redo Log on 11.2.0.2 (Doc ID 1324598.1)

Last updated on FEBRUARY 25, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.2 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.

Symptoms

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>
NOLOGGING
AS
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:

 

Cause

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In this Document
Symptoms
Cause
Solution
References

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