RE: ORA-01555 seems bogus
Date: Mon, 8 Feb 2010 10:05:10 -0500
An ORA-01555 is never bogus, but very misleading as you've found out. OK, so the query in question is part of a package. Is the package called from some application that's doing a "commit across a cursor", or is the package doing it internally? Lots of places to look and undo is the very last.
Senior Oracle DBA/NA Team Lead
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Herring Dave - dherri Sent: Saturday, February 06, 2010 10:10 PM To: oracle-l_at_freelists.org
Subject: ORA-01555 seems bogus
Folks, I've got a curious situation where we're getting regular ORA-01555 errors yet they don't seem correct. First a few things on the set up:
- 4-node RAC (+ 4-node RAC DG)
- RHEL 8 x 64GB servers
The query returned in the error is doing a full scan of a 3,100 row table, which takes less than 1 sec to complete. I've tried the same query repeatedly and it always takes less than one second, even when trying it while ORA-01555 errors are being returned saying that query is failing elsewhere. The query is run 10,000+ times per day, always run from the same node.
The ORA-01555 error lists this query as having a duration of around 12,000 seconds each time, which from what I can tell is impossible. Again, it's a 3,100 row table, no parallelism, 1 index (which isn't used by this query). I checked LAST_ANALYZED and the table hasn't been analyzed in 4 days. I checked DBA_TAB_MODIFICATIONS and it's had around 200 DML's since it was analyzed, but the last of which was 2 days ago.
So is Oracle returning the wrong query? Is the ORA-01555 bogus? Checking GV$UNDOSTAT, SSOLDERRCNT matches the # of ORA-01555 we're seeing (87 today, all the same query). All instances have the same UNDO_RETENTION (3600) and similarly sized undo tablespaces.
Any clues how to catch the trouble making queries?
Dave Herring | DBA, Global Technology Services
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Received on Mon Feb 08 2010 - 09:05:10 CST