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Operating Systems Linux Red Hat Does it make sense to reduce the total shared memory Post 302992234 by rbatte1 on Thursday 23rd of February 2017 07:04:51 AM
Old 02-23-2017
The database will have a configuration for memory that it requires to be real memory rather than being eligible to be swapped. If you exhaust real memory by having too much guaranteed as real memory for all the databases put together, then the server as a whole can suffer. If a general process requires some memory and there is very little swap-able available, then the new process will be almost permanently waiting for swap as it tries to perform whatever it needs.

You don't say what versions of Oracle you are using, but the principle is the same, although they may configure it in different ways.



I hope that this helps,
Robin
 

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MEMORY_PRESSURE(1)					    BSD General Commands Manual 					MEMORY_PRESSURE(1)

NAME
memory_pressure -- Tool to apply real or simulate memory pressure on the system. SYNOPSIS
memory_pressure [-l level] | [-p percent_free] | [-S -l level] OPTIONS
-l <level> Apply real or simulate memory pressure (if specified alongside simulate argument) on the system till low memory notifications cor- responding to <level> are generated. Supported values are "warn" and "critical". -p <percent_free> Allocate memory till the available memory in the system is <percent_free> of total memory. If the percentage of available memory to total memory on the system drops, the tool will free memory till either the desired percentage is achieved or it runs out of memory to free. -S Simulate memory pressure on the system by placing it artificially for <sleep_seconds> duration at the "warn" or "critical" level. -s <sleep_seconds> Duration to wait before allocating or freeing memory if applying real pressure. In case of simulating memory pressure, this is the duration the system will be maintained at an artifical memory level. DESCRIPTION
A tool to apply real or simulate memory pressure on the system SEE ALSO
vm_stat(1) Mac OS X Mar 7, 2013 Mac OS X
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