topic Monitor RAM on Linux Redhat in Operating System - Linux

Monitor RAM on Linux Redhat

Grzegorz Jajuga — Mon, 09 May 2011 20:42:05 GMT

How to monitor Linux RAM under Linux.
I have oracle database on linux server with 32GB RAM for oracle I have 10GB and when I start the database on linux server I have free only 2GB.
Question is how to calcutate on which process consume ram on OS.

Re: Monitor RAM on Linux Redhat

Matt Palmer_2 — Tue, 10 May 2011 09:53:22 GMT

Hi,

can you provide more detail. You can use 'top' to show you the highest consumers of RAM/CPU/resource on the running system.

Have you checked to see if the machine is swapping?

regards

Re: Monitor RAM on Linux Redhat

klb — Tue, 10 May 2011 18:27:31 GMT

Confirm Oracle's use of memory via:

ipcs -am

This will show the segments allocated for Oracle and all other users of Shared Memory.

man ps

look for options there that display memory information for each process.

Hth,

-klb

Re: Monitor RAM on Linux Redhat

Alzhy — Wed, 11 May 2011 12:22:13 GMT

Peruse, analyze and deduce via the tools:

free
vmstat
cat /proc/meminfo
ipcs -m

Oracle is quite agressive is using free memory as cache. No matter how large memory you have configured -- your free memory in most tools will show very low available memory -- and the reason -- cache.

Post your output from the aboe tools and people in the forum can expound.