Parallel Online Redefinition For LOB Table
(Doc ID 2315184.1)
Last updated on JANUARY 22, 2020
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 to 22.214.171.124 [Release 11.2 to 12.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
PARALLEL is not working with expected degree when using DBMS_REDEFINITION for the table (table contains only one LOB column) migration from basicfile to securefile with partitioned destination table.
The migration process is using DBMS_REDEFINITION and following parallel settings have been set at session level before executing the redefinition:
ALTER SESSION ENABLE PARALLEL DML ;
ALTER SESSION FORCE PARALLEL DML PARALLEL 128 ;
ALTER SESSION FORCE PARALLEL QUERY PARALLEL 128 ;
If DBMS_REDEFINITION is executed with another table that doesn't contain LOB column, then parallelism works perfectly.
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