DataPump Import (IMPDP) Is Slow When Importing Partitioned Tables (Doc ID 1073195.1)

Last updated on NOVEMBER 28, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 10.1.0.2 to 11.2.0.1 [Release 10.1 to 11.2]
Oracle Database - Enterprise Edition - Version 11.2.0.3 to 11.2.0.3 [Release 11.2]
Oracle Database - Enterprise Edition - Version 11.2.0.4 to 11.2.0.4 [Release 11.2]
Information in this document applies to any platform.
***Checked for relevance on 28-MAR-2013***

Symptoms

When importing partitioned tables into existing partitioned tables with PARALLEL > 1 there will be Worker processes waiting for an exclusive table lock which is indicated by event "enq: TM - contention".

To confirm the issue, execute the following queries during the Impdp client session reports:

Processing object type TABLE_EXPORT/TABLE/TABLE_DATA

 

Changes

This issue occurs if the following is true:

- Imported table is a partitioned table
- Data Pump Import (Impdp) uses parameter PARALLEL > 1 and TABLE_EXISTS_ACTION=APPEND or TRUNCATE

Cause

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