pgpool-II 4.7.0 Documentation
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# 3.1. Managing kernel resouces

To run Pgpool-II System V shared memory and System V semaphore are necessary. Although on linux enough amount of both resources are provided, other platforms may need to configure the kernel parameters.

The minimum requirement of System V shared memory is around 140 MB. If you plan to use more than default 64MB of query cache, you may need more shared memory. Number of necessary shared memory segments is 3. Usually the kernel provides enough shared memory segments.

The minimum requirement of System V semaphore is around 10. Number of necessary semaphore sets is 3. Usually the kernel provides enough semaphore sets.

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