Thanks Gopal, your information is very helpful! On 9/10/07, K Gopalakrishnan <kaygopal@xxxxxxxxx> wrote: > > Li Li, > In current versions, JUST RAC alone can not provide the 24x7 > availability. You need to have the combination of RAC+Dataguard (logical) to > have REAL 24x7 availability. Also not all patches/upgrades are 'rolling > upgrade' capable. > Have a look at this presentation to undertand the issues in rolling > upgrade. > > http://www.oracle.com/technology/deploy/availability/pdf/oow06/S281209_To.pdf > > -Gopal > > On 9/10/07, Li Li <litanli@xxxxxxxxx> wrote: > > Hi, All, > > > > I recently patched our 2-node RAC (10.2.0.2 on RHEL AS 4 update 4) to > > 10.2.0.3. I got the impression that you can do rolling upgrade in a RAC > > environment, until I dig into the patch installation document and found > out > > that you can do rolling upgrade on the clusterware part but not on the > RAC > > database part. Fortunately we can afford the service to be down for a > couple > > of hours. > > > > My question is: is there a way to keep your RAC database up while you > patch > > it? RAC itself doesn't really provide 24x7 High Availability? Any > comments? > > > > Thanks, > > -Li > > -- > Best Regards, > K Gopalakrishnan > Co-Author: Oracle Wait Interface, Oracle Press 2004 > http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/ > Author: Oracle Database 10g RAC Handbook, Oracle Press 2006 > http://www.amazon.com/gp/product/007146509X/ > > > >