我有一个包含此结构和索引的表
CREATE TABLE [dbo].[Report4](
[Id] [int] IDENTITY(1,1) NOT NULL,
[Mesc] [nvarchar](50) NULL,
[Line] [nvarchar](5) NULL,
[Unit] [nvarchar](5) NULL,
[Description] [nvarchar](500) NULL,
[ST_CODE] [nvarchar](5) NULL,
[PbsNo] [nvarchar](50) NULL,
[PbsDate] [nvarchar](10) NULL,
[PbsQty] [nvarchar](10) NULL,
[PbsQtyRec] [nvarchar](10) NULL,
[QtyConsum1] [nvarchar](10) NULL,
[QtyConsum2] [nvarchar](10) NULL,
[QtyConsum3] [nvarchar](10) NULL,
[QtyConsum4] [nvarchar](10) NULL,
[QtyConsum5] [nvarchar](10) NULL,
[Type] [nvarchar](20) NULL,
[InvQty] [nvarchar](10) NULL,
[TypeRequest] [nvarchar](50) NULL,
[HeaderId] [bigint] NULL,
[LOCATION] [nvarchar](10) NULL,
CONSTRAINT [PK_Report4] PRIMARY KEY CLUSTERED
(
[Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
CREATE NONCLUSTERED INDEX [HeaderId] ON [dbo].[Report4]
(
[HeaderId] ASC
)
INCLUDE ( [Id],
[Mesc],
[Line],
[Unit],
[Description],
[ST_CODE],
[PbsNo],
[PbsDate],
[PbsQty],
[PbsQtyRec],
[QtyConsum1],
[QtyConsum2],
[QtyConsum3],
[QtyConsum4],
[QtyConsum5],
[Type],
[InvQty],
[TypeRequest]) 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
CREATE NONCLUSTERED INDEX [HeaderIdRAll] ON [dbo].[Report4]
(
[HeaderId] ASC
)
INCLUDE ( [Id],
[Mesc],
[Line],
[Unit],
[Description],
[ST_CODE],
[PbsNo],
[PbsDate],
[PbsQty],
[PbsQtyRec],
[QtyConsum1],
[QtyConsum2],
[QtyConsum3],
[QtyConsum4],
[QtyConsum5],
[Type],
[InvQty],
[TypeRequest]) 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
CREATE NONCLUSTERED INDEX [LineNOIRHeaderId] ON [dbo].[Report4]
(
[Line] ASC
)
INCLUDE ( [HeaderId])
WHERE ([line]='I')
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
CREATE NONCLUSTERED INDEX [LineNoRHeaderId] ON [dbo].[Report4]
(
[Line] ASC
)
INCLUDE ( [HeaderId])
WHERE ([line]='H')
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
CREATE NONCLUSTERED INDEX [LineNoRMesc] ON [dbo].[Report4]
(
[Line] ASC
)
INCLUDE ( [Mesc])
WHERE ([line]='I')
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
CREATE NONCLUSTERED INDEX [MescRAll] ON [dbo].[Report4]
(
[Mesc] ASC
)
INCLUDE ( [Id],
[Line],
[Unit],
[Description],
[ST_CODE],
[PbsNo],
[PbsDate],
[PbsQty],
[PbsQtyRec],
[QtyConsum1],
[QtyConsum2],
[QtyConsum3],
[QtyConsum4],
[QtyConsum5],
[Type],
[InvQty],
[TypeRequest],
[HeaderId]) 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
我想为此表运行此查询
ALTER PROCEDURE [dbo].[SPSelectReport2] (@StringWhereParameter nvarchar(4000),@PageIndex int,@PageSize int )
AS
BEGIN
SET NOCOUNT ON;
-- َ Begin Of Transaction
begin tran
declare @from int=(@PageSize*(@PageIndex-1))+1
declare @to int=(@PageIndex*@PageSize)
declare @Query nvarchar(max)
set @Query=' select
distinct id, [Mesc], [Line]
,[Unit]
,[Discription]
,[InvQty]
,[LastDateNil]
,[StCode]
,[PlanCode]
,[MIN]
,[MAX]
,[LastDateConsum]
,[PbsNo]
,[PbsDate]
,[PbsQty]
,[PbsQtyRec]
,[DateDelay]
,[TypeRequest]
,[HeaderId]
,LOCATION
from (
SELECT *, ROW_NUMBER() OVER(ORDER BY Id) ROW_NUM
FROM(
((SELECT Id,[Mesc]
,[Line]
,[Unit]
,[Discription]
,[InvQty]
,[LastDateNil]
,[StCode]
,[PlanCode]
,[MIN]
,[MAX]
,[LastDateConsum]
,[PbsNo]
,[PbsDate]
,[PbsQty]
,[PbsQtyRec]
,[DateDelay]
,[TypeRequest]
,[HeaderId]
,LOCATION
FROM [MyMaterialDB].[dbo].[Report2]
WHERE headerid IN(SELECT HeaderId FROM [MyMaterialDB].[dbo].[Report2] WHERE line=''H'''+ @StringWhereParameter+'))
UNION
(
(SELECT Id,[Mesc]
,[Line]
,[Unit]
,[Discription]
,[InvQty]
,[LastDateNil]
,[StCode]
,[PlanCode]
,[MIN]
,[MAX]
,[LastDateConsum]
,[PbsNo]
,[PbsDate]
,[PbsQty]
,[PbsQtyRec]
,[DateDelay]
,[TypeRequest]
,[HeaderId]
,LOCATION
FROM [MyMaterialDB].[dbo].[Report2]
WHERE mesc IN(SELECT mesc FROM [MyMaterialDB].[dbo].[Report2] WHERE line=''I''' +@StringWhereParameter+'))
UNION
(SELECT Id, [Mesc]
,[Line]
,[Unit]
,[Discription]
,[InvQty]
,[LastDateNil]
,[StCode]
,[PlanCode]
,[MIN]
,[MAX]
,[LastDateConsum]
,[PbsNo]
,[PbsDate]
,[PbsQty]
,[PbsQtyRec]
,[DateDelay]
,[TypeRequest]
,[HeaderId]
,LOCATION
FROM [MyMaterialDB].[dbo].[Report2]
WHERE mesc IN(SELECT HeaderId FROM [MyMaterialDB].[dbo].[Report2] WHERE line=''I'''+@StringWhereParameter+')
)))) a)b where b.ROW_NUM between '+CAST(@from as varchar(10))+' and '+CAST(@to as varchar(10))
-- Order by Mesc,Line,unit
exec(@Query)
--print @Query
--
if @@error = 0
Commit Tran
Else
rollback tran
End
进入此表我有超过1000000条记录，当运行此sp时，需要十分钟或更长时间。如何优化结构或查询。请帮我。谢谢大家。
答案 0 :(得分：0)
对于初学者，您必须执行以下操作（我认为只有那些操作可以将您的查询执行时间缩短到不到一分钟）：
in clause。 select ... from ... where a in (select ...)是a）非常非常慢，b）危险，因为它可以运行你的sql server内存 - 特别是像你的大型数据集 - 。您必须将所有条款更改为left outer joins，这样做非常容易。distinct clause。这会强制您的查询按（在示意图后面）执行排序，并且通常也非常慢。尝试重新编写您的查询，以便记录已经不同union更改为union all。联盟与distinct union相同，这与我之前的陈述相同。如果您使用union all，您的查询会有很大的改进...只要您可以将数据带到不需要的地方...... 如果您设法在之前的3次更改中设置至少2次，我认为您会看到很大改进。如果您可以处理所有这些问题，那么查询速度非常快。
而且，不要费心将sql exec更改为“预先编译的”存储过程。我认为你不会通过这样做获得显着改善（我认为你有动态，所以在任何情况下这都不是申请人）。
请告诉我这是否有效。