hi with patches (not patchsets) you have several options 1. full outage, that is shutting down all instances and you patch in a node the patch will be propagated to the rest of nodes 2. partial outage, you can choose patch 5 nodes per time, apply in one of 5 nodes the patch is propagated to the other 4 automatically 3. rolling upgrade, one node per time quite a few patches supports rolling upgrade nowdays, with rolling upgrade patches you can choose from these three methods otheriwse the only choice is method 1 thanks -- LSC On 8/29/07, Khan, Muhammad S <Muhammad.Khan@xxxxxx> wrote: > > Hi Gurus. > > > > I haven't done much of the work on Oracle RAC, but I was having a serious > debate about Oracle RAC verses SqlServer 2005 clustering option (trying to > defend Oracle) with my Project Manager, when he raised the point that if you > have 50 instances in Oracle RAC, and you have to apply a patch, you'll have > to apply patch on every single instance. Whereas in Sqlserver 2005, you > would apply the patch on one instance and it will be done on all of them, > just like that. > > > > I was not sure about his argument cuz I've never applied a patch on Oracle > RAC, but those of you who have experienced this, may have a better comment > on this. Will you please share this here so that I get my concepts clear > about Oracle RAC before getting engaged into any such debate again? > > > > Thanks. > > >