Shell Programming and Scripting

Hello,

I am using Rehat Oracle Enterprise server.

Every time almost 150 process running on my server.
#ps -ef | grep oracle | wc -l

Now i want to calculate how much memory spend by each process or all process together.

Ok. You may have a bad assumption. Those processes being run as the oracle user are working on shared memory to a large extent. That means if you add up 150 processes' memory usage it well be greater than virtual memory - because those processes are accessing the same SGA -- for example.

You can get very exact information about each process using the /proc filesystem:
The proc File System

But. The shared memory caveat still applies.