RE: The good old ORA-01555 rollback too small
- From: "Goulet, Dick" <DGoulet@xxxxxxxx>
- To: <Michael.Kline@xxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 9 Feb 2005 09:03:35 -0500
Michael,
You've got it right, someone did an update/delete somewhere
along the way, committed & left. Suggestion try speeding up the queries
that these programs use. Sometimes a specialized index is just the
trick. Have a job that archives data from PeopleSoft's CM_ACCTG_LINE
table, 500M rows today. They create a specialized index on the table at
the start of the program, great for locking things that get in the way
up, do their thing, and then drop the index. Not only does it make the
ORA-01555 go away but it cut the run time down around 60%.
Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA
-----Original Message-----
From: Kline.Michael [mailto:Michael.Kline@xxxxxxxxxxxx]=20
Sent: Wednesday, February 09, 2005 8:16 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: The good old ORA-01555 rollback too small
ORA-01555: snapshot too old: rollback segment number 3 with name "RBS02"
too small
=20
Production got one of these last night from two huge jobs trying to run
against a table in the range of 200M rows. They were reading this table
based on perhaps months and codes to build another table. So perhaps job
A was reading "base" to build "job_a_table" based on current month and a
set of codes, and job B was reading "base" to build "job_b_table" based
on a different set of criteria.
=20
I would normally assume this would have been just fine.
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If not, is there any "locking" that can be done to stop the ORA-01555?
=20
(I still suspect some where along the line, someone tried to update
while these jobs were running.)
=20
This has been running fine in the past. There are some new jobs being
brought into production.
=20
Oracle is 8.1.7.4 on HP-UX. Rollback capacity is in the vicinity of 32
GB and has never ran out yet.
=20
=20
=20
Michael Kline
Database Administration
SunTrust Technology Center
1030 Wilmer Avenue
Richmond, Virginia 23227
Outside 804.261.9446
STNet 643.9446
Cell 804.744.1545
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