How to PROPERLY restart services via ssh

like in topic, RHEnterprise,
how can i restart services via ssh,

my server sometimes has very high loads, i am trying to killing processes in top (k option) but some services sometimes must be restarted,

so if anyone has second and can write it here... How to PROPERLY restart services via ssh
apache
bind
mysql
exim
proftpd

i know how to restart them, but i dont know am i doing it properly, should i use stop/start command or restart... hehm

 

 

 

 

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