Basic SQL Query Plan Qs
- From: VIVEK_SHARMA <VIVEK_SHARMA@xxxxxxxxxxx>
- To: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>, "sfaroult@xxxxxxxxxxxx" <sfaroult@xxxxxxxxxxxx>
- Date: Tue, 19 Feb 2008 06:11:40 +0530
Folks
SQL Query:-
select ..
from DTD
where account_num='N1'
and tran_date='10-02-2005'
NOTE - DTD Table has 400,000 rows approx with ALL its Records having just 1
Date Value '12-06-2005' (i.e. a date value which is NOT in the SQL Query)
DTD Table has multiple values of account_num but does NOT have the specific
account_num 'N1' specified in the SQL Query.
Running on which of the following indexes will be most performing & why?
Index 1 - Unique index on (tran_date, some field2, another field3)
Index 2 - account_ num
Index 3 - (account_ num, tran_date)
Optimizer - CBO
Oracle 10.2.0.3
Cheers & Thanks
Vivek
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