索引未在索引视图上应用

时间:2012-01-02 11:11:07

标签: sql sql-server-2008 view clustered-index indexed-view

我有一个索引视图,但是当我在该视图上运行查询时,未应用基于View构建的索引,并且查询在没有索引的情况下运行。下面是我的虚拟脚本: 表+视图+视图索引

CREATE TABLE P_Test
  (
     [PID]      INT IDENTITY,
     [TID]      INT,
     [StatusID] INT
  )

CREATE TABLE T_Test
  (
     [TID] INT IDENTITY,
     [FID] INT,
  )

CREATE TABLE F_Test
  (
     [FID]      INT IDENTITY,
     [StatusID] INT
  )

GO

INSERT INTO F_Test
SELECT TOP 1000 ABS(CAST(NEWID() AS BINARY(6)) %10) --below 100
FROM   master..spt_values

INSERT INTO T_Test
SELECT TOP 10000 ABS(CAST(NEWID() AS BINARY(6)) %1000) --below 1000
FROM   master..spt_values,
       master..spt_values v2

INSERT INTO P_Test
SELECT TOP 100000 ABS(CAST(NEWID() AS BINARY(6)) %10000) --below 10000
                  ,
                  ABS(CAST(NEWID() AS BINARY(6)) %10)--below 10
FROM   master..spt_values,
       master..spt_values v2

GO

CREATE VIEW [TestView]
WITH SCHEMABINDING
AS
  SELECT P.StatusID AS PStatusID,
         F.StatusID AS FStatusID,
         P.PID
  FROM   dbo.P_Test P
         INNER JOIN dbo.T_Test T
           ON T.TID = P.TID
         INNER JOIN dbo.F_Test F
           ON T.FID = F.FID

GO

CREATE UNIQUE CLUSTERED INDEX [PK_TestView]
  ON [dbo].[TestView] ( [PStatusID] ASC, [FStatusID] ASC, [PID] ASC )
  WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

GO 

现在,当我运行以下查询时,未应用[PK_TestView]索引:

    SELECT PStatusID ,
        FStatusID ,
        PID  FROM [TestView] 

SELECT PStatusID ,
        FStatusID ,
        PID  FROM [TestView] 
WHERE [PStatusID]=1

SELECT COUNT(PStatusID) FROM [TestView] 
WHERE [PStatusID]=1
你可以帮我解决这个问题吗?

1 个答案:

答案 0 :(得分:4)

您需要使用NOEXPAND提示。除非您使用Enterprise Edition引擎,否则SQL Server将不考虑在没有此情况下匹配索引视图(即使查询中引用了视图名称)。

SELECT COUNT(PStatusID) 
FROM [TestView] 
     WITH (NOEXPAND) -- this line
WHERE [PStatusID]=1

这应该会给你第一个,便宜得多的计划

Plan