Informix shared memory consumption

In the process of porting an application to Informix (Online 7.11.UC2), I'm having a perplexing problem. The amount of shared memory that Informix uses keeps growing until the SHMTOTAL is reached, at which point the application aborts. The application is a long-running daemon process, but the logical units of work are small and discrete. It appears that whenever my application performs a database transaction (select, update, etc.) Informix is allocating some amount of shared memory to support that. It also appears that this shared memory is never being released until the process is terminated. I've checked trace files, and all of my OPEN/CLOSE CURSOR and BEGIN/COMMIT WORK statements are balanced. I've also checked my code using AIB Software's Sentinel for memory leaks, and it's come up clean A miniscule amount of shared memory can reclaimed by performing an "onmode -F", but the amount reclaimed is tiny (<10%) of the amount I would expect to be reclaimed after my process has finished serving a request. This is on and NCR 3455 and on an NCR 3600, both running AT&T UNIX SVR4 release 4.0. Any suggestions on how to limit Informix's shared memory consumption will be most appreciated. -David Miller -- David D. Miller | " Oh, I get it. ddmiller@io.com | You're a plant, right?" | - Heather Locklear, "Return of the Swamp Thing"