Rational requires that the shared memory and semaphore kernel parameters on the database server have at least the minimum values shown. You might need 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.
If you are adding users to a database or creating a server, increase the shared memory and semaphore kernel parameter values.