DataPump Export (EXPDP) Is Slow Using Default ESTIMATE=BLOCKS Due To Long Execution of Query of SYS.X$KTFBUE
(Doc ID 2378391.1)
Last updated on MARCH 02, 2025
Applies to:
Oracle Database Cloud Schema Service - Version N/A and laterOracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
- DataPump Export (EXPDP) was very slow using the default ESTIMATE=BLOCKS, and spent several hours in ESTIMATE phase, when export thousands tables.
- From sql trace file of DataPump Export, almost all those time is spent on the following recursive SQL.
* The whole trace file is near 20 GB, and it is too large to format the whole file with tkprof, and the following is the tkprof formatted result of first 500 MB:
Changes
NONE
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |