Parameter _rollback_segment_count can cause trouble

Posted by Mike Dietrich on Oracle Blogs See other posts from Oracle Blogs or by Mike Dietrich
Published on Wed, 19 Sep 2012 13:02:58 +0000 Indexed on 2012/09/19 21:44 UTC
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/Oracle/Best Practice

Just some weeks ago we've learned that setting the hidden underscore parameter:

_rollback_segment_count

may cause trouble during upgrade. This parameter is used in very rare cases to have under all circumstances and situations this specified number of UNDO's online. Now during upgrade this may result in massive latch contention due to bug14226559 - and there's a patch available as well. Recommendation is to unset it during upgrade.

I don't think that many people will hit this as I personally haven't seen databases with this underscore in their init.ora or spfiles. So take this post more or less as a reminder for myself

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