Database Administration (MOSC)

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Undo tables goes offline automatically

edited Apr 29, 2009 12:47AM in Database Administration (MOSC) 4 commentsAnswered ✓
 hi, If you see the queries I have listed below.

There is a rollback segment which for some reason has come offline.  These segments are used in a cyclical fashion and with the UNDO management it is trying to switch over the next one.  However since it is offline it cannot and continues to fill up the previous one. (_SYSSMU46$ is now over 5gb).

 What I had to do the last time this occurred was rebuild the Undo tablespace (hence RBS02 instead of RBS01).  What I do not know is why a rollback segment comes offline… and the last time this happened I was not able to bring it back online.

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