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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Designing for High Performance

Of course, the difference is that now partitioning is based on reducing intra-node block pinging  between instances over the cluster interconnects, instead of reducing disk pinging. At most, we can expect a factor of 40 improvements for the same application running on a RAC server, versus an OPS-based server. Once the various system latencies are added, the speed difference between memory operations and disk operations falls to approximately a factor of 40 between a disk ping and an intra-node memory ping. The speed is dependent upon the speed of the interconnect. Still, a factor of 4000% (40) is nothing to sneeze at.

• Designing applications for better performance on RAC involves:

• Assigning transactions with similar data access characteristics to specific nodes.

• Creating data objects with parameters that enable more efficient access when globally shared.

• Automating free space allocation and de-allocation (use of locally managed tablespaces.

• Automating block management (local freelist management).

• Using sequences properly (using sequence ranging triggers for each instance).

• Optimizing all SQL in the application.

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