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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Tbs READ ONLY and Snapshot too old
ORA-01555 indicates that Oracle was attempting to reconstruct the state of a
block and the earlier state was not available in the undo segments. By
definition, you cannot get an ORA-01555 error when trying to access a
read-only object.
Do you get these ORA-01555 errors shortly after doing the load or do you get them throughout the day? The only thing I can think is that these errors are caused by delayed block cleanout, but that should take care of itself soon after the load. If you get errors throughout the month, I would suspect that the big tables aren't the cause.
Justin Cave
Distributed Database Consulting, Inc.
http://www.ddbcinc.com <http://www.ddbcinc.com/askDDBC> /askDDBC
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]
On Behalf Of NGUYEN Philippe (Cetelem)
Sent: Friday, June 11, 2004 4:15 AM
To: oracle-l_at_freelists.org
Subject: Tbs READ ONLY and Snapshot too old
Hi List,
just a little question about read only tbs :
We have big tables that are loaded once and never updated during the month ,
so I think it's a good thing to switch their tbs to read only mode.
Web have a lot of script that request thoses heavy tables to build small
tables and we often encounter ORA-01555.
Do you think that "in general" this operation could enhance our ORA-01555
problems ?
TIA
Philippe
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