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@xxxxxxxxxxxxx -----Original Message----- From: Barbara Baker [mailto:barbarabbaker@xxxxxxxxx] Sent: Wednesday, February 25, 2004 10:27 AM To: oracle-l@xxxxxxxxxxxxx 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 __________________________________ Do you Yahoo!? Yahoo! Mail SpamGuard - Read only the mail you want. http://antispam.yahoo.com/tools ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------