I think you do have to run post installation scripts. Thanks Mayen "Jason Heinrich" <jheinrichdba@xxxxxxxxx> Sent by: oracle-l-bounce@xxxxxxxxxxxxx Mar 31 2009 01:15 PM Please respond to jheinrichdba@xxxxxxxxx To orcl@xxxxxxx cc oracle-l <oracle-l@xxxxxxxxxxxxx> Subject Re: upgrade 10.1.0.4 to 10.2.0.4 - question about components The comment about "add all patches" got me thinking: if you install the 10.2.0.4 patchset and then install patch 16, do you only have to do the upgrade, or do you have to also follow the post-installation instructions for patch 16, which call for running catcpu among other things. -- Jason Heinrich On Tue, Mar 31, 2009 at 8:25 AM, orcl <orcl@xxxxxxx> wrote: I think I may also mention that I have 5 databses sharing one home my plan is to install 10.2.0.1 - patch to 10.2.0.4 into a new home, and add all patches, then manually upgrade 1 database at a time to the new home