RE: undo segments vs. rbs
- From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 18 May 2004 16:38:52 -0400
I don't think it does, Paula. Since you don't have control over the =
number
and sizes of your undo segments, there really isn't a direct =
correlation.
Sizing undo really comes down to two questions:
1.) How long is your longest running query?
Make sure your undo_retention is at least that large.
2.) How much undo will your database generate in
the amount of time specified in undo_retention?
Make sure your undo tablespace is at least that
large.
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of
Paula_Stankus@xxxxxxxxxxxxxxx
Sent: Tuesday, May 18, 2004 4:34 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: RE: undo segments vs. rbs
I am working on moving a productional database from 8.0.6 to 9i. I have =
=3D
a question: if I have 10 rbs at 128K (initial and next extent) and one =
=3D
"large" on at 10,485,760 bytes how does that translate into undo =3D
segments? =3D20
Are there any best practices on sizing undo segments?
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