My Oracle Support Banner

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

Last updated on MAY 04, 2023

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

To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!


In this Document
Symptoms
Changes
Cause
Solution
References

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.