I'm reviving this topic because I happen to have a real-life need to do another 10g upgrade and in planning I came up with a couple more benefits of using exp/imp: 1) You can retain your old version of the database, completely unchanged, as a fallback in case of problems during/after the upgrade. 2) You can go directly from any version to 10g, rather than having to be on 126.96.36.199, 188.8.131.52+, 184.108.40.206+ or 10.2.0.2+, which are the prerequisites for a direct upgrade to 10.2. In my case, I've currently got about 50 databases all running on 220.127.116.11 - do I want to go through the trouble of patching them all to 18.104.22.168 just as a stepping stone to 10g, or just go straight to 10g via exp/imp? I think I'll go for the shorter path. Also, I found these comments from the 10.2 upgrade guide http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14238/preu p.htm#BABFHFIJ: Export/Import Benefits Upgrading using Export/Import offers the following benefits: * Defragments the data - you can compress the imported data to improve performance. * Restructures the database - you can create new tablespaces or modify existing tables, tablespaces, or partitions to be populated by imported data. * Enables the copying of specified database objects or users - you can import only the objects, users, and other items that you wish. * Serves as a backup archive - you can use a full database export as an archive of the current database. Regards, Brandon ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Dennis Williams Sent: Monday, March 05, 2007 6:31 PM To: Oracle Discussion List Subject: Re: 10g upgrade survey List, Here are the results as I tally them so far. Favorite upgrade method: Manual by a whisker (favored by 7 vs. 6 DBAs, as I count them, double counting some people who favored both methods) A close runner-up was Exp/Imp. Naturally if you have a large database and a short downtime window, exp/imp may not work for you. One person stated he had used dbua successfully many times. Three others stated they were bitten by dbua. Thanks for everyone's input. Dennis Williams Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.