To determine the amount of work and cost related to inter-instance messaging and contention, examine block transfer rates, remote requests made by each transaction, the number and time waited for global cache events as described under

The response time for cache fusion transfers is determined by the messaging and processing times imposed by the physical interconnect components, the IPC protocol and the GCS protocol. It is not affected by disk I/O factors other than occasional log writes. The cache fusion protocol does not require I/O to data files to guarantee cache coherency and Oracle RAC inherently does not cause any more I/O to disk than a nonclustered instance.

To more about Basic Oracle RAC Events : Click Here

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