To limit the number of user connections to fewer than your license allows, use the -iqgovern switch to control query use.
The -iqgovern switch controls the number of concurrent queries on a particular server.
Use the -iqgovern switch to help IQ optimize paging of buffer data out to disk and avoid overcommitting memory. The default value of -iqgovern is (2 x the number of CPUs) + 10. You may need to experiment to find an ideal value. For sites with large numbers of active connections, set -iqgovern slightly lower.