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Oracle Database 11g Oracle Real Application Clusters Handbook, Second Edition by K Gopalakrishnan

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Design Considerations

Before going to the design and implementation of extended clusters, let’s take a look at the key points to consider when designing a solution that involves “geo-clusters.” Network infrastructure plays a major role in extending Oracle RAC, because performance is greatly impacted by roundtrip latency. An optimal solution is to increase the distance between the datacenters without introducing additional latency for I/O operations.

Speed of Light

In a vacuum, light travels at 186,282 miles per second. To make the math simpler, we can round that off to 200,000 miles per second, or 200 miles per millisecond. In any computer communications, we require confirmation for any message, so we must use roundtrip distances for our calculations. ...

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