Basic SQL Query Plan Qs
Date: Tue, 19 Feb 2008 06:11:40 +0530
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
Cheers & Thanks
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