Re: FTS, db file sequential read on undo

  • From: Scott <oraracdba@xxxxxxxxx>
  • To: vbarac@xxxxxxxxxxxx, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
  • Date: Mon, 13 Apr 2009 11:51:05 -0700 (PDT)

Sorry that undo bug I sent is not published but is the backport for AIX 5L

Here is the one that is published for undo Bug: 6658921

From: Vladimir Barac <vbarac@xxxxxxxxxxxx>
To: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
Sent: Monday, April 13, 2009 9:36:12 AM
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
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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