measuring most-expensive queries

Hi folks,

I'd like to find out which queries are most expensive (taking very
long or producing high load) in a running system, to see what
requires further optimization. (the application is quite large
and some more folks involved, so I cant check evrything manually).

Well, the postmaster can log ev'ry single statement, but its
really too for a human person, to read the log files.

Is there any tool for that ?

thx
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