START_REDEF_TABLE Builds Wrong Primary Key Index Attributes
(Doc ID 1914635.1)
Last updated on FEBRUARY 26, 2019
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.1 to 126.96.36.199 [Release 10.2 to 12.1]
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.
While using a PK based online redefinition, start_redef_table() always builds the PK Index NoParallel which causes bad execution performance. i.e, DBMS_REDEFINITION builds the target table with wrong Primary Key index attributes.
If there is table with a primary key index and this primary key is compressed or has a parallel clause the:
If you use the DBMS_REDEFINITION package to rebuild the table then the index on the target table has no parallel clause.
If you have a compressed key index the redefinition operation fails with ORA-28665
Steps to reproduce:
- alter table <interim_table> disable primary key
(internal statement to drop the pk index)
- <complete refresh>
- alter table <interim_table> enable primary key
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