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12c DataPump Export (EXPDP) Is Slow When Exporting Statistics (Doc ID 2120162.1)

Last updated on NOVEMBER 03, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.1 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.

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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In this Document
Symptoms
Changes
Cause
Solution
References

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