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Virtual memory segment in Informix

Learn why there is no correct amount for the virtual memory segment in Informix.

What is the correct amount of virtual memory segment that I have to set in the onconfig file in Informix ver 7.31?


There is no "correct" amount for the virtual memory segment in Informix. The larger the virtual memory segment, the better the performance because the database can read data from cache instead of disk. If you make the value too large, you can cause the system to swap or page.

If your Informix database is being used with some third party software, check with the application vendor and see if they have any recommendations. You can also use glance to determine the free memory on your system, to help size the onconfig file appropriately.

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