HELP!!!-----Need to Sql commands to monitoring Postgresql

Hi all,
         i have 5 servers that have been installing postgresql .In order to
know the postgresql working  status and monitor them ,moreover i don't want
to  use the monitor tools .I  want to use the SQL commands to monitoring
postgresql system . please suggest any SQL COMMANDS to work successfully.if
you have some good suggestion ,you can email to me
(charles.xie@sanmina-sci.com) or sky :xqwbx163



best regards

charles_xie




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