how explain works

From: Radhya sahal <rad_cs_2006(at)yahoo(dot)com>
To: pgsql-performance group <pgsql-performance(at)postgresql(dot)org>
Subject: how explain works
Date: 2011-04-11 23:02:31
Message-ID: 64088.55807.qm@web38604.mail.mud.yahoo.com
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Dear ,all
plz could any one help me !!!
how explian works as math equations to estimate cost with  constatn query
parameters
such as cpu_tuple cost ,random page cost ...etc
 i want maths  expression  in order to know how these parameters will effect in
cost ???
please any one can help me ??
 
 
Regards
Radhya...

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