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
Friends,
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 9.2.0.4/AIX5.2L.
Thanks in advance.
Regards,
Prem.
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