Parallel Online Redefinition For LOB Table

(Doc ID 2315184.1)

Last updated on OCTOBER 09, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 to 12.2.0.1 [Release 11.2 to 12.2]
Information in this document applies to any platform.

Goal

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.

Solution

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