RE: snapshot tool old from source over db link
- From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 1 Sep 2004 22:31:09 -0400
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@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of David
Sent: Wednesday, September 01, 2004 4:15 PM
To: oracle-l@xxxxxxxxxxxxx
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
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