Slow Performance Due to Waits for: "Enq: KO - Fast Object Checkpoint" and "Reliable Message"
(Doc ID 1377830.1)
Last updated on AUGUST 26, 2023
Applies to:
Oracle Database - Enterprise Edition - Version 11.2.0.1 to 11.2.0.3 [Release 11.2]Oracle Database - Enterprise Edition - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
- EM displays a huge amount of 'Application' and 'Other' on the 'Average active sessions' chart compared to normal
- CKPT process consistently high in the process list
- AWR top 5 wait events show :
- "enq: KO - fast object checkpoint"
- "reliable message"
- ASH report Top SQL with Top Events shows queries with high waits on "enq: KO - fast object checkpoint"
- A review of the tables in the query revealed that the table is defined to use the keep cache:
- The Initialization parameters section in AWR report indicate that DB_KEEP_CACHE_SIZE was not set,
Cause
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In this Document
| Symptoms |
| Cause |
| Solution |
| References |