Database Appears to Hang Waits for "Wait for a undo record" and "Wait for stopper event to be increased" Due to Parallel Transaction Recover
(Doc ID 464246.1)
Last updated on NOVEMBER 28, 2024
Applies to:
Oracle Database Cloud Schema Service - Version N/A and laterOracle Database Exadata Express Cloud 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
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
- Database appears to hang
- Undo tablespace is growing.
- Systemstate dump shows the significant waits are for "Wait for a undo record" and "Wait for stopper event to be increased".
The systemstate dump shows the following waitevents:
and in this second section the process in question has been waiting for 'wait for a undo record' event for 243 seconds.
The wait events "Wait for a undo record" and "Wait for stopper event to be increased" are mainly meant for parallel transaction recovery.
Cause
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In this Document
| Symptoms |
| Cause |
| Solution |
| References |