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DataPump Performance: Impdp Slow When Importing Partitioned Table (Doc ID 1327029.1)

Last updated on MARCH 05, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.2 and later
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 Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

DataPump is slow with partitions.

You divided for example the export of a 900G partitioned table into four expdp dumps with partitions. The export of the whole table takes about 12 hours, the parallel run of the partition dumps about 5 hours. This saves 7 hours.

The import of the whole table running parallel 32 takes about 3 hours, but the parallel import of the four partition dumps never ends (canceled after 12 hours). Only one worker is seen in each import dump is running (31 are waiting).

 

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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