小弟的数据库中有三个表Create Table Clearing
(
cNumber char(14) NOT NULL,--主键
eNumber char(14) NOT NULL,
cPriceTot money NOT NULL,
cTPrice money NOT NULL,
cRPrice money NOT NULL,
cAPrice money NOT NULL,
cUPrice money NOT NULL,
InvoiceId bigint NULL,
PieceworkId bigint NULL,
cInput varchar(60) NOT NULL,
cInputTime datetime NOT NULL,
cOPrice money NOT NULL,
cVPrice money NOT NULL
)Create Table Entrust
(
eId bigint IDENTITY,--主键
clientNumber varchar(18) NOT NULL,
clientName nvarchar(80) NOT NULL,
clientSalesman varchar(60) NULL,
eNumber char(14) NULL,
ePrincipal varchar(100) NULL,
ePhone varchar(100) NULL,
eSend bit NOT NULL,
eUrgent bit NOT NULL,
eSendAddress varchar(80) NULL,
eReceive varchar(60) NULL,
eClaimFinishTime varchar(30) NULL,
eClaim varchar(-1) NULL,
eItemName nvarchar(80) NULL,
eState char(1) NOT NULL DEFAULT ('N'),
eCurrentFlow nvarchar(200) NULL,
eInput varchar(60) NULL,
eInputTime datetime NOT NULL DEFAULT (getdate()),
eLog varchar(-1) NULL
)Create Table Entrust_State
(
State char(1) NULL,
StateText varchar(20) NULL
)一个视图CREATE VIEW [dbo].[v_Clearing]
AS
SELECT dbo.Entrust.clientNumber, dbo.Entrust.clientName, dbo.Entrust.clientSalesman, dbo.Clearing.eNumber, dbo.Entrust.ePrincipal, dbo.Entrust.eSend,
dbo.Entrust.eUrgent, dbo.Entrust.eSendAddress, dbo.Entrust.ePhone, dbo.Entrust.eReceive, dbo.Entrust.eClaimFinishTime, dbo.Entrust.eClaim,
dbo.Entrust.eItemName, dbo.Entrust.eState, dbo.Entrust.eCurrentFlow, dbo.Entrust.eInput, dbo.Entrust.eInputTime, dbo.Entrust.eLog, dbo.Clearing.cNumber,
dbo.Clearing.cPriceTot, dbo.Clearing.cOPrice, dbo.Clearing.cRPrice, dbo.Clearing.cTPrice, dbo.Clearing.cVPrice, dbo.Clearing.cAPrice, dbo.Clearing.cUPrice,
dbo.Clearing.cInput, dbo.Clearing.cInputTime, dbo.Clearing.InvoiceId, dbo.Clearing.PieceworkId, dbo.Entrust_State.StateText
FROM dbo.Clearing INNER JOIN
dbo.Entrust ON dbo.Clearing.eNumber = dbo.Entrust.eNumber INNER JOIN
dbo.Entrust_State ON dbo.Entrust.eState = dbo.Entrust_State.State
查询数据时一般是
select StateText,cNumber,clientName,eItemName,cPriceTot,cOPrice,cRPrice,cTPrice,(cRprice+cTprice) as validPrice,cAPrice,cUPrice,InvoiceId,PieceworkId,cInput,cInputTime
from [v_Clearing]
where
eState in ('S','P','F') and
clientNumber = 'KD0211400001'
and (cInputTime between '2012-06-01' and '2012-06-19')
order by cNumber desc之前数据库在1万以内时查询速度很快,一般1秒以内
但近几天数据到了1.3W以上
查询时间涨到了20秒的样子我把语句改为select StateText,cNumber,clientName,eItemName,cPriceTot,cOPrice,cRPrice,cTPrice,(cRprice+cTprice) as validPrice,cAPrice,cUPrice,InvoiceId,PieceworkId,cInput,cInputTime
from
(select * from dbo.Entrust_State) as ts,
(select * from dbo.Entrust where eState in ('S','P','F') and clientNumber = 'KD0211400001' ) as te,
(select * from dbo.Clearing where cInputTime >= '2012-06-01') as tc
where ts.state=te.eState and te.eNumber=tc.eNumber查询时间又到了1秒以内,但如果我加上
order by cNumber desc 排序
查询时间又要7秒的样子,还是有些慢请大神们给个优化方案,万分谢谢
select StateText,cNumber,clientName,eItemName,cPriceTot,cOPrice,cRPrice,cTPrice,(cRprice+cTprice) as validPrice,cAPrice,cUPrice,InvoiceId,PieceworkId,cInput,cInputTime
from
(select * from dbo.Entrust_State) as ts,
(select * from dbo.Entrust where eState in ('S','P','F') and clientNumber = 'KD0211400001' ) as te,
(select * from dbo.Clearing where cInputTime >= '2012-06-01') as tc
where ts.state=te.eState and te.eNumber=tc.eNumber---将 所有的 * 号换成你要取的字段(不要偷懒)有助提高速度。
---select * from dbo.Entrust where eState in ('S','P','F') and clientNumber = 'KD0211400001' 用UNION ALL 来实现,在clientNumber、eNumber、eState 上建索引(或复合索引)
--select * from dbo.Clearing where cInputTime >= '2012-06-01' 在cInputTime 上建索引
---同样可以在 cNumber 上面建索引
select StateText,cNumber,clientName,eItemName,cPriceTot,cOPrice,cRPrice,cTPrice,(cRprice+cTprice) as validPrice,cAPrice,cUPrice,InvoiceId,PieceworkId,cInput,cInputTime
from
(select * from dbo.Entrust_State) as ts,
(select * from dbo.Entrust where eState in ('S','P','F') and clientNumber = 'KD0211400001' ) as te,
(select * from dbo.Clearing where cInputTime >= '2012-06-01') as tc
where ts.state=te.eState and te.eNumber=tc.eNumber/****************以上子查询可以直接改为表连接查询吧!,然后在where条件里限制,另外有需要的字段加索引。
Entrust(clientNumber ,eState )去掉子查询直接连接
cTPrice,(cRprice+cTprice) as validPrice,cAPrice,cUPrice,InvoiceId,PieceworkId,cInput,cInputTime
from dbo.Entrust_State(nolock) as ts
inner join dbo.Entrust(nolock) as te on ts.state=te.eState
inner join dbo.Clearing(nolock) as tc on te.eNumber=tc.eNumber
where te.eState in ('S','P','F') and te.clientNumber = 'KD0211400001'
and tc.cInputTime >= '2012-06-01'
order by tc.cNumber desc