From: Radhya sahal <rad_cs_2006@yahoo.com>
To: pgsql-performance group <pgsql-performance@postgresql.org>
Subject: optimizer parameters
Date: Sun, 10 Apr 2011 11:22:57 -0700 (PDT)
Message-ID: <77760.3733.qm@web38606.mail.mud.yahoo.com> (raw)
Dear ,all
i would to ask you about how postgresql optimizer parameters :-
1- random page cost
2- cpu tuple cost3- cpu operator cost4- cpu index tuple cost5- effective cache
size
play as parameters in cost estimator equation
i imagine that cost function is the same as
f(x,y,z,....)=ax+by......
cost(cpu tuple cost,cpu operator cost,....)
can any one help me to know the equation that cost estimator used it..
My regard
Radhya,,,,
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Subject: Re: optimizer parameters
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