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RE: to undo or not to undo

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Wed, 25 Feb 2004 11:27:36 -0600
Message-ID: <0186754BC82DD511B5C600B0D0AAC4D607B00050@EXCHMN3>


Barbara - Another thought for you. Avoid migration. Unless the database is incredibly large and your downtime window is impossibly small. Create a fresh 9i instance, and export/import the data. That is my preference. Either way, be sure to test your process beforehand.

Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----

From: Barbara Baker [mailto:barbarabbaker_at_yahoo.com] Sent: Wednesday, February 25, 2004 10:27 AM To: oracle-l_at_freelists.org
Subject: to undo or not to undo

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 - 11:27:50 CST

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