SQL SERVER索引使用实例

添加索引

IF EXISTS (SELECT name FROM sysindexes

WHERE name = 'IX_writtenExam')

DROP INDEX testtable.IX_writtenExam

/*--笔试列创建非聚集索引：填充因子为％--*/

CREATE NONCLUSTERED INDEX IX_writtenExam

ON testtable(id)

WITH FILLFACTOR= 30

GO

查询测试

/*-----指定按索引IX_writtenExam 查询----*/

declare @startTime datetime

SET @startTime = GETDATE();

SELECT sum(ID) FROM testtable with (INDEX=IX_writtenExam)

declare @endtime datetime

SET @endtime = GETDATE();

print datediff(ms,@startTime,@endtime)

SELECT sum(ID) FROM testtable

添加数据

SET IDENTITY_INSERT TestTable ON

declare @i int

set @i=1

while @i<=400000

begin

insert into TestTable([id], FirstName, LastName, Country,Note)
values(@i, 'FirstName_XXX','LastName_XXX','Country_XXX','Note_XXX')

set @i=@i+1

end

SET IDENTITY_INSERT TestTable OFF