DataPump Import Via NETWORK_LINK Is Slow With CURSOR_SHARING=FORCE
Last updated on MAY 19, 2017
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 to 10.2.0.3 [Release 9.2 to 10.2]
Information in this document applies to any platform.
*** Checked for relevance on 170Nov-2016 ***
DataPump import with NETWORK_LINK is being considered to migrate to a new database. But DataPump import is going slow while running a query for the estimation phase which tries to determine whether the table to be imported is empty or not.
Below query performs a full table scan which doubles the cost of DataPump import.
FROM email@example.com WHERE ROWNUM = 1),0)
This query also results in too many network packets which makes the performance much worse.
Step to reproduce, e.g.
CURSOR_SHARING on the source site has been set to FORCE or SIMILAR.
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