Index which is the best for performance is automatically used. USE AdventureWorks GO SELECT * This document describes how to force the use of an index in a query by using directives in the SQL statement. To force the query optimizer to use the idx_buyprice index, you use the following query: SELECT productName, buyPrice FROM products FORCE INDEX (idx_buyPrice) WHERE buyPrice BETWEEN 10 AND 80 ORDER BY buyPrice; This time, the index was used for finding the products as shown in the following EXPLAIN statement: DBA can direct SQL Server which index to be used to execute query. In my previous article SQL SERVER – Introduction to Force Index Query Hints – Index Hint I have discussed regarding how we can use Index Hints with any query. Example 1 : SQL Server using default index.
拿着这个SQL去请教项目组的数据库大牛，仅仅加了一个force index，花了1s多就出结果了。修改后的SQL如下： select customer,count(1) c from upv_** force index(idx_created) where created between "2015-07-06" and "2015-07-07" group by customer having c > 15 order by c desc SELECT ObjectId, ObjectName, ObjectType FROM TblForceIndexHint with (index (0)) WHERE CreateDate >= GETDATE() - 50 -- Forcing query to using IX_ObjectId indexes created on ObjectId SELECT ObjectId, ObjectName, ObjectType FROM TblForceIndexHint with (index (IX_ObjectId)) WHERE CreateDate >= GETDATE() - 50 -- Forcing query to using IX_CreateDate indexes created on CreateDate … SQL Server makes uses Index which has lowest cost based on performance. There are some instances when Database Developer is best judge of the index used.
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