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Home -> Community -> Mailing Lists -> Oracle-L -> RE: snapshot tool old from source over db link
David,
See this URL:
http://www.jlcomp.demon.co.uk/faq/settrans.html
for a (hopefully lucid) explanation of why=20
doing 'set transaction use rollback segment ....'
will not solve an ORA-1555.
The most likely solution is to increase the size and/or number of rollback segments to avoid the ORA-1555. Also, if your rollback segments are not equally sized, consider that likelyhood of encountering ORA-1555 is directly=20 dependent on the size of the SMALLEST rollback segment, not the largest one.
Hope that helps,
-Mark
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of David
Sent: Wednesday, September 01, 2004 4:15 PM
To: oracle-l_at_freelists.org
Subject: snapshot tool old from source over db link=20
I have a materialized view in a data warehouse.
On the hour, the view is refreshed from production.
The refresh fails on occasion due to ora-1555(snapshot too old), that
occurs in the prod db or source across db links.
I would like to use set transcation and use a large RBS.
How can I accomplish this when the view and refresh exists in one db, =
but
the db generating the 1555 is across db links and would not benefit from
set transaction as the local rb segments are not the issue.
Hmmmm?
Thanks
--=20
..
David
FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html
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Recent messages - http://freelists.org/archives/oracle-l/09-2004 Received on Thu Sep 02 2004 - 02:30:33 CDT
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