I want to know that is there any limit of resurces.
If yes then what.

like cron job. How many time i can run it in an hour.
runnning query in dabases etc.

You can run as many SQL queries or Cron Jobs as you want,
as long as the server load doesn't cross the 25 mark.

25 mark..? What is this?

This time I want to run cron jobs 4 times an hour. May be more later.

25% server load is the limit

You mean I can do 25% of server or all account in your reseller package can do 25% of server.
is this fine to run cron jobs 4 times an hour

Yes.
As long as the cron job being run doesn't overload/slowdown the server.


A normal vBulletin forum also runs a lot of scheduled tasks (/cron) 2-3 times an hour,
and i haven't seen the server being slowed down by it.

Thanx,
Shadab.

Just one last thing.
Can you tell me what things make server slow. so i will not do that in future.
Bcz some time my doesn't work i don't think before doing anything

Some examples are :

Proxy scripts, Live video/webcam feeds/processors,

IRC Bots, Torrents (torrent flux),

Sending hundreds/thousands of mails in a short interval
(that will make the server slow, as well as its classed as spamming)

etc.

I will have to send 200 mails / mo but at one time. Is it possible?
I can modify the script (not ready for instance)