Limit on number of instances in RAC

Hi,
Is there any limit on number of Oracle Instances (other than hardware resources) in RAC environment.
Thanks
Manmohan

In theory, no. Certainly not one that you're going to hit unless you're planning on hitting a triple digit number of nodes.
In practice, as you add nodes, the scaling factor decreases, so adding nodes gets less and less bang for the buck as you add additional nodes. Most applications (particularly those not designed with massive scale-out in mind) have various bottlenecks that tend to get more and more apparent as additional nodes are added which require more and more tuning efforts to identify and remove. So your application(s) most likely impose much lower practical caps on the number of nodes than Oracle does.
Justin

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