Dne 12.4.2011 01:22, Radhya sahal napsal(a):
> Thanks Mr Nathan Boley ,
> i want these equations to solve thsese equtions of parameters and total
> time in order to get each paramter formula
> i need these formula in my experiments is very important to know the
> rate for each parameter in total
..
From: Nathan Boley
To: Radhya sahal
Cc: pgsql-performance group
Sent: Mon, April 11, 2011 4:09:07 PM
Subject: Re: [PERFORM] how explain works
> how explian works as math equations to estimate cost with constatn query
> parameters
> such as cpu_tuple cost ,random page co
> 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 ???
The expressions are complicated, and they are certainly not linear
