RE: FTS, db file sequential read on undo
Date: Mon, 13 Apr 2009 11:50:35 -0400
Message-ID: <6AFC12B9BFCDEA45B7274C534738067F14D0A1A2_at_AAPQMAILBX02V.proque.st>
Delayed block cleanout comes to mind.....
-Mark
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Vladimir Barac
Sent: Monday, April 13, 2009 11:36 AM
To: oracle-l_at_freelists.org
Subject: FTS, db file sequential read on undo
Hello, listers
We are facing rather strange situation... When accessing table for analyze or to export table, we are seeing "db file sequential read" wait event. V$session_wait file# is 2, that is - UNDO tablespace. Because of this analyze or export take forever to complete.
Why would analyze or export access UNDO tablespace? There are definitely no transactions at all on the system going on at the time of export/analyze.
Thanks for all insights,
Vladimir Barac
Database administrator | Alghanim Industries
P.O. Box 223, Safat 13003, Kuwait
Tel: +965 1881 111 / ext. 2960
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-- http://www.freelists.org/webpage/oracle-lReceived on Mon Apr 13 2009 - 10:50:35 CDT