Yes, once you set the compatible parameter to 11g, you cannot downgrade it back to 10g as control files get updated, i had the same issue hence had to do a complete restore as application team wanted to downgrade the database after upgrade. On Mon, Feb 13, 2012 at 10:12 PM, Michael Dinh <mdinh@xxxxxxxxx> wrote: > From my understanding, once you set compatible, there's no undo. > > Hence, if you have multiple databases, I would think setting compatible to > the lowest version. > > If you are 110% sure the database will be isolated, then safe to set > compatible to 11.2.0.2.4 > > Michael Dinh > Disparity Breaks Automation (DBA) > > Great minds discuss ideas; average minds discuss events; small minds discuss > people - Eleanor Roosevelt > Confidence comes not from always being right but from not fearing to be wrong > - Peter T Mcintyre > > -----Original Message----- > From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On > Behalf Of Syed Jaffar Hussain > Sent: Sunday, February 12, 2012 11:06 PM > To: Oracle-L Freelists > Subject: pros/cons of setting COMPATIBLE parameter 11.2.0 or 11.2.0.2.4 > > Good day list, > Very recently we have upgraded our 10gR2 (10.2.0.4) databases to 11gr2 and > applied latest PSU patch (11.2.0.2.4). However, for some concerns, the > COMPATIBLE parameter value was kept to 10.2.0.4. Now we need to change the > COMPATIBLE parameter value reflecting to 11gR2. Therefore, I need an advice > over setting the parameter to 11.2.0 OR 11.2.0.2.4? What are the pros and > cons do you foresee. > > Thanks in advance. > > -- > Best Regards, > > Syed Jaffar Hussain > Oracle ACE Director > <http://apex.oracle.com/pls/otn/f?p=19297:4:4640302666204919::NO:4:P4_ID:186> > Oracle Certified Master > (10g)<http://education.oracle.com/education/otn/shussain.html> > Co-author Oracle 11gR1/R2 RAC Essentials <http://link.packtpub.com/yNZicz> > *Oracle Magazine DBA of year (2011)* > OCP 8i,9i,10g & 11g DBA > RAC Certified Expert > ITIL V3 foundation certified > Oracle RAC SIG Representative for Saudi Arabian > region<http://www.oracleracsig.org> > > Advisory & Governance Council for > VirtaThon<http://www.brainsurface.com/virtathon/advisorygovernancecouncil/> > I blog at : http://jaffardba.blogspot.com/ > LinkedIn : http://www.linkedin.com/in/sjaffarhussain > Follow me on twitter : http://twitter.com/#!/sjaffarhussain > -------------------- > "Winners don't do different things. They do things differently." > > > -- > //www.freelists.org/webpage/oracle-l > > > -- > //www.freelists.org/webpage/oracle-l > > -- Thanks & Regards Nilesh Oracle DBA (sqlplus "/as sysdba" is my world) "As our circle of knowledge expands, so does the circumference of darkness surrounding it."--Einstein "All men die, few men ever truly live" -- Braveheart "You can get help from teachers, but you are going to have to learn a lot by yourself, sitting alone in a room." --Dr. Seuss "Know me for what I do and for not what I am. Judge me for what I can do and not for what I have done."-Unknown "Don't walk in front of me, I may not follow. Don't walk behind me, I may not lead. Just walk beside me and be my friend."- Albert Camus "Never argue with an idiot. They drag you down to their level and then beat you with experience." - Unknown -- //www.freelists.org/webpage/oracle-l