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"Failure to Extend RBS" in the Alert Log with Automatic Undo Management (Doc ID 247184.1)

Last updated on FEBRUARY 17, 2024

Applies to:

Oracle Database - Enterprise Edition - Version 8.0.3.0 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle 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
Information in this document applies to any platform.
RDBMS (Generic platforms)

Symptoms

In the Database alert.log the following messages are seen:

 
Explanation

This states the RBS is in FULL status and it is not able to extend.
While it is marked FULL, no new transactions will use the rollback segment.
When the last transaction in the rollback segment commits, the FULL status is cleared.
Altering the rollback segment ONLINE or OFFLINE will also clear the FULL flag, even if not all transactions have committed yet.

Changes

UNDO_MANAGEMENT=AUTO
UNDO_TABLESPACE=RBSUNDO1
UNDO_RETENTION=21600                  # in seconds (default is 900)
UNDO_SUPPRESS_ERRORS=FALSE 

Cause

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