to undo or not to undo

From: Barbara Baker <barbarabbaker_at_yahoo.com>
Date: Wed, 25 Feb 2004 08:27:10 -0800 (PST)
Message-ID: <20040225162710.51287.qmail@web14424.mail.yahoo.com>

Howdy, list.
For those of you who migrated a database from 8i to 9i, did you move convert to undo tablespace immediately? Did you run for awhile still using rollback segments then convert later? Any gotcha's?

I cannot find a concise doc on how to change over.
(I'm using notes from Kirti's excellent RMOUG
presentation on "Understanding Automatic Undo.." but I've already forgotten stuff.)

Here are the steps I know. What I do not know is when to remove my rollback segments. If I add the undo params to init then bounce the db, can I then offline the rbs segs and tablespace after I come back up? Or do I offline them before I bounce the db?

Anyone know of a doc that outlines this stuff? Thanks for any help.
Solaris 9 Oracle 9.2.0.4
Barb

(here's what I think I need to do)

Changing Rollback Segments to Undo

set compatible 9.0.0 in init (currently 8.1.7.4)

create undo tablespace

create undo tablespace undotbs1
datafile '/class17db/u01/undotbs1.dbf' size 500m;

insert init parameters

	undo_management=AUTO
	undo_retention=10800
	undo_tablespace=UNDOTBS1
	undo_suppress_errors=TRUE

shut down and restart database

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Received on Wed Feb 25 2004 - 10:24:03 CST