Looking for pointers in troubleshooting -> RAC performance degradation (single instance is fine)

Folks,  

We have an app that is running well in single instance but when put on a 2-node or 3-node RAC, we see pretty much similar performance. However, if the CPU time is 55-60% in single instance, it becomes 20% in 3-node RAC and top-5 itmed events become..  

"gc buffer busy", "gc current block busy", "enq: TX- index contention  

Any help in what to look for will be greatly appreciated.  

Thanks,  

• Pradeep

Pradeep Chetal
Sr. Director - Infrastructure Architecture

Mformation Technologies Inc.
Switchboard: +1 732 692 6200  

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