what filter first column by the oracle optimizer
If anyone can help to understand what filter first column by the optimizer oracle by example below and why?Select * from emp where ENAME = 'FORD '.
AND SAL = 3000;
Hello
Look at the MAP of the EXPLAIN command.
All things being equal, if there is more distinct values of ename, Sal, then it's probably looking for "FORD" first.
For example, the table has 100,000 rows and there are distinct 10 000 distinct enames and 100 sals, ename and sal are indexed, but there is no combined index.
If you are looking for by sal firstly, this means that you wait about 1,000 lines of the search index, and then you have to test each of these 1,000 rows for the right ename.
If you are looking for by ename, first of all, it means that you wait about 10 lines of the search index, and you will only test each of these 10 rows for the sal on the right.
The order in which the terms were written will count.
Published by: Frank Kulash, April 2, 2012 07:54
Tags: Database
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Search in this example, you will see the difference
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