How to measure the sap system performance

hi experts ,
i want to understand how the system performance is calculated in sap. for example " How system , database performances are calculated by sap in SE30, SCI - sap code inspector " ...
With regards ,
James..
Valuable answers will be rewarded...

Hi James,
Check these links, they will help you
http://help.sap.com/saphelp_nw04s/helpdata/en/8a/3b834014d26f1de10000000a1550b0/frameset.htm
http://help.sap.com/saphelp_nw04s/helpdata/en/d1/801f7c454211d189710000e8322d00/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/d1/801f7c454211d189710000e8322d00/frameset.htm
Thanks
Janani
award points if helpful

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