ORA-01555 seems bogus
- From: "Herring Dave - dherri" <Dave.Herring@xxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Sat, 6 Feb 2010 21:10:02 -0600
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)
* 10.2.0.2
* 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
A c x i o m C o r p o r a t i o n
630-944-4762 office | 630-430-5988 cell | 630-944-4989 fax
1501 Opus Pl | Downers Grove, IL, 60515 | U.S.A. | www.acxiom.com
Service Desk: 888-243-4566, https://servicedesk.acxiom.com, GSCA@xxxxxxx
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