Depends if your application workload can be logically partitioned such that your db services can direct independent workloads to different nodes - otherwise if you treat rac like a black box then there is often a tendency for cluster waits to have a high impact as you round robin requests for the same data to different nodes. Date: Wed, 26 Mar 2014 11:14:09 -0700 From: ckaj111@xxxxxxxx Subject: why are some applications oracle but not RAC compatible? To: oracle-l@xxxxxxxxxxxxx Can anyone tell me why an application would be compatible with oracle but not rac? I'm assuming it must have to do with connectivity, but not sure why that isn't transparent to all applications? Thanks in advance.