SMON: ABOUT TO RECOVER UNDO SEGMENT %s messages in alert log

(Doc ID 266159.1)

Last updated on DECEMBER 06, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 8.1.5.0 to 9.2.0.8 [Release 8.1.5 to 9.2]
Information in this document applies to any platform.
***Checked for relevance on 11-Jul-2016***


Symptoms

There are lots of messages appearing in alert log of the following form

SMON: about to recover undo segment %s
SMON: mark undo segment %s as available


when instance recovery is performed after a abnormal shutdown.

Cause

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