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Capture is Slow to Mine Redo Containing a Significant Number of DDL Operations. (Doc ID 564772.1)

Last updated on SEPTEMBER 01, 2020

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 10.2 to 11.1]
Oracle Database Cloud Schema 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
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
Oracle Server Enterprise Edition - Version: to


The Capture process is impacted by significant DDL activity.

The DDL may not be relevant to Streams and may not be Captured.

The Capture process is nevertheless affected and latency results.

You may also be seeing high activity on on system.logmnr_dictstate$ (a combination of deletes and insert)
to keep track of the DDL transaction activity.

A additional symptom might be waits from the preparer process :   'enq: MN - contention' ; these waits
may also be visible in an AWR report.


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