Each thread in the database server has its own stack area in the virtual portion of shared memory.

For a description of how threads use stacks, see Stacks. For information about how to monitor the size of the stack for a session, see monitoring sessions and threads section in your HCL Informix® Performance Guide.

The size of the stack space for user threads is specified by the STACKSIZE parameter in the onconfig file. You can change the size of the stack for all user threads, if necessary, by changing the value of STACKSIZE.

You can use the INFORMIXSTACKSIZE environment variable to override the STACKSIZE value in the server configuration file. Set INFORMIXSTACKSIZE in the environment and recycle the instance.

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