Check shared memory and semaphore kernel parameters

Shared memory and semaphore kernel parameters must meet minimum requirements.

Shared memory and semaphore kernel parameters on the database server must meet at least the minimum values shown. You might want to increase them if there are more than 20 users per database server. The values shown are the values used by Informix® for testing the port to each platform.

Because the optimal values depend on your hardware, network configuration, software, and workload, ask your system administrator for assistance.

The ipcs command, which shows the current shared memory that is in use, can help you debug shared memory problems.

If you are adding users to a database or creating a server, increase the shared memory and semaphore kernel parameter values. Before changing the kernel parameters, perform a complete backup of the system (for example, save a copy of the kernel).

Information is given for the following platforms:

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