Which plan is better - what COST really means ?

  • From: "Prem Khanna J" <premj@xxxxxxxxxxxxxx>
  • To: oracle-l@xxxxxxxxxxxxx
  • Date: 13 Jan 2005 08:57:11 -0000

when i have got two plans , how do i decide 
which one is the best ?

just read in asktom , that COST of a plan , 
does not have any correspondence with response
time of a query.

i.e.,a query with higher COST than another
 can be faster.

if so , what in the execution plan does help 
me to decide about a good (faster) plan ? 

unless i execute it , can't i know it ? 
is that the only way !!!

Can someone throw light on this ?
The environment is oracle

Thanks in advance.


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