Oracle FAQ Your Portal to the Oracle Knowledge Grid

Home -> Community -> Mailing Lists -> Oracle-L -> RE: Tbs READ ONLY and Snapshot too old

RE: Tbs READ ONLY and Snapshot too old

From: NGUYEN Philippe (Cetelem) <>
Date: Fri, 11 Jun 2004 13:02:37 +0200
Message-ID: <DCEE3C62548AFE48ADF88CBFDB8260A2050891F1@NGMAIL3>

thank Justin,
Errors occurs during the month but we have a very bad application that generate sql scripts with a lot of cursors opened on thoses big tables ( more than 20Go per tables) thoses script create small tables (10 - 200 Mo) with datas pick up from the different big tables. The problem is that the generated script are often launch in the same time and I we can't touch the code.  

Philippe Nguyen
CETELEM - Administration, Architecture Décisionnelle Direction Customer Relationship Management E-Mail :
Tel : (+33) 1 46 39 92 16 - Fax : (+33) 1 46 39 59 88

-----Message d'origine-----

De : []De la part de Justin Cave
Envoyé : vendredi 11 juin 2004 12:15
À :
Objet : 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. <> /askDDBC  

From: [] On Behalf Of NGUYEN Philippe (Cetelem)
Sent: Friday, June 11, 2004 4:15 AM
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 ?

Please see the official ORACLE-L FAQ:

To unsubscribe send email to: put 'unsubscribe' in the subject line.
Archives are at
FAQ is at

Received on Fri Jun 11 2004 - 05:59:47 CDT

Original text of this message