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Oracle GoldenGate 11g Implementer's guide by John P Jeffries

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Balancing the load across parallel process groups

The GoldenGate documentation states "The most basic thing you can do to improve GoldenGate's performance is to divide a large number of tables among parallel processes and trails. For example, you can divide the load by schema".This statement is true as the bottleneck is largely due to the serial nature of the Replicat process, having to "replay" transactions in commit order. Although this can be a constraining factor due to transaction dependency, increasing the number of Replicat processes increases performance significantly. However, it is highly recommended to group tables with referential constraints together per Replicat.

The number of parallel processes is typically greater on the target ...

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