12c DataPump Export (EXPDP) Is Slow When Exporting Statistics

(Doc ID 2120162.1)

Last updated on OCTOBER 10, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.1 and later
Information in this document applies to any platform.
***Checked for relevance on 10-Oct-2017***

Symptoms

Experiencing slow DataPump Export starting with 12c when exporting statistics and DW00 process is doing 'insert into "SYS"."IMPDP_STATS" ...'.

Tkprof output of the DW00 process shows very long execution plan for insert into "SYS"."IMPDP_STATS" statement:

Changes

The DataPump performance issue is due to 0 cardinality for OBJ$/USER$ indexes after instance restart.

Cause

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