How to know server status variable in postgresql?

Hai, I am developing a java application for performance counter. For that i
want to collect all server status counter names with current value. i just
did it for MySQl by, *"SHOW GLOBAL STATUS"*. is their any query similar this
to collect those details from the database. I am new to postgresql, so i
dont know about it well. So if you know help me friends.

Thanks in advance



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