Datapump Import is Very Slow in 12c with Large Number of Object Grants
(Doc ID 2069397.1)
Last updated on FEBRUARY 26, 2019
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 to 22.214.171.124 [Release 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud 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
Information in this document applies to any platform.
For certain expdp dump file, Datapump import (impdp) into 11g took 3 hours compared to 7 hours in 12c.
There are many Grants to be imported and much time is used for OBJECT_GRANT and INDEX objects, e.g.
"Completed 6962 INDEX objects in 16470 seconds"
In the AWR report, next code is being run over and over many times:
DataPump Import (impdp) ran fine in 11g but this is happening in 12c.
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