Monitor the shared-memory segments to determine the number and size of the segments that the database server creates. The database server allocates shared-memory segments dynamically, so these numbers can change. If the database server is allocating too many shared-memory segments, you can increase the SHMVIRTSIZE configuration parameter. For more information, see the chapter on configuration parameters in the IBM Informix Dynamic Server Administrator's Reference.
The onstat -g seg command lists information for each shared-memory segment, including the address and size of the segment, and the amount of memory that is free or in use. For an example of onstat -g seg output, see information on the onstat utility in the IBM Informix Administrator's Reference.
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