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Status Future consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Jun 17, 2022

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.

Needed By Not sure -- Just thought it was cool