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Limit open partitions to avoid very large rsam pool
In systems with a lot of tables informix can have a very large rsam pool. This can cause informix to allocate so much memory it starts swapping or in memory limiting versions (like workgroup, express etc.) to even let the engine crash.
Sometimes this is triggered by relatively simple sql statements like: SELECT dbsname, tabname, sum(size) sz, count(*) num FROM sysextents GROUP BY 1,2 ORDER BY 4 DESC
The current solution has is to set CLOSE_PARTP and PART_INCR but this does often does not prevnt the issue and certainly not the situation describe above.
The nicest solution would be that Informix would close partions earlier if a certain configurable memory limit is reached. Just like one can set the SPL cache etc. If designed correctly this would not impact the reliability of the instance negatively, only make the engine a bit slower in situations which would otherwise lead to swapping and/or crashes.
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