How to grab PID Details?

I have RH Linux 3.0 E, httpd is eating resources 5% to 10% and causing the slow response for server. I want to know how can i find the details of any single PID?

PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
28921 apache 16 0 36140 34M 7856 S 20.2 3.4 0:00 0 httpd


Now i want to see the details of PID 28921 which is eating too many resources. How can i find this? I want to know the root of PID so i will be able to suspend the domain causing for this activity. I need help with all of your you tech guys.

 

 

 

 

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