DataPump Performance: Impdp Slow When Importing Partitioned Table
(Doc ID 1327029.1)
Last updated on MAY 27, 2020
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database 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.
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).
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