Performance Impact of RAC Interconnect Traffic

You should use the DBA AWR Interconnect Traffic report. This report displays information about interconnect usage by instance in a RAC configuration.

The key categories displayed are `ipq` (Parallel query communications), `dlm` (Database lock management), and `cache` (Global cache communications). Other values are typically internal to Oracle and not expected to have high usage.

High `cache` traffic indicates frequent global cache communications, often implying that buffer blocks are being transferred frequently between instances. This may point toward poor data locality or insufficient buffer cache sizing.