DataPump Import (IMPDP) Is Slow When Importing Partitioned Tables
Last updated on NOVEMBER 28, 2016
Applies to:Oracle Database - Enterprise Edition - Version 10.1.0.2 to 18.104.22.168 [Release 10.1 to 11.2]
Oracle Database - Enterprise Edition - Version 22.214.171.124 to 126.96.36.199 [Release 11.2]
Oracle Database - Enterprise Edition - Version 188.8.131.52 to 184.108.40.206 [Release 11.2]
Information in this document applies to any platform.
***Checked for relevance on 28-MAR-2013***
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:
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
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