Oracle-L: RE: strange issue with setting transaction

From: Fink, Dan <Dan.Fink_at_mdx.com>
Date: Fri, 03 Jan 2003 12:24:39 -0800
Message-ID: <F001.00526DED.20030103122439@fatcity.com>

Sergei,

	Do you get the same error each time?
	Here is what I think is happening (please, gurus, correct me if I am

wrong). Your transaction needs to create a read consistent version of a block to see if another transaction has modified the row you are interested in modifying. Thus it needs to read the undo entry in the "R27" rollback segment. However, this undo entry has been overwritten, so the ORA-1555 error is raised. This error lists the rbs that it needs to read, not the one the transaction is currently using.

Another possibility is that delayed block cleanout from a previous load/update is causing the problem. I know there is someone (Jonathan Lewis?) who has great information on this topic, but I don't recall who it is. As we say in the states, "Little help here?".

Dan Fink

-----Original Message-----
Sent: Friday, January 03, 2003 12:49 PM
To: Multiple recipients of list ORACLE-L

I am running 8.1.6 on solaris 2.8.

Before running a large update, I tried to set a specific rollback segment by:
Set transaction use rollback segment RBIG20;

The transaction runs for a while and fails with:

ORA-01555: snapshot too old: rollback segment number 29 with name "R27" too
Small

Any idea?

Thank you

Sergei

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Author: Sergei
INET: sergei_at_netflip.com

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Author: Fink, Dan
INET: Dan.Fink_at_mdx.com

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