On Tue, Mar 20, 2012 at 6:36 AM, Purav Chovatia <puravc@xxxxxxxxx> wrote: > Hi, > We have a requirement to apply application patches online i.e. without > downtime. Our apps run in active-active mode and hence the app layer is > taken care of i.e. while instance-1 of app is being upgraded, the live > traffic is handled by instance-2. And once that is done, live traffic is > handled by instance-2 and instance-1 is upgraded. However the challenge is > to modify the DB objects i.e. SPs, tables, indices, etc. > > > If anybody has some best practices that are being followed can you please > share? > Hi, Have you ever consider building a new database and use some kind of one way data replication - like logical standby, Streams or Golden Gate. With you production traffic running on database 1 you can do a upgrade to your required version and do all schema changes on database 2 and just use replication to keep data up to date. After all changes just switch application to database 2 and rebuild database 1. I have used logical standby for rolling upgrades from 11.1 to 11.2 and it took around 2 min downtime - application switchover time. regards, -- Marcin Przepiorowski http://oracleprof.blogspot.com -- //www.freelists.org/webpage/oracle-l