實戰(zhàn)：上億數(shù)據(jù)如何秒查
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作者：Java我人生
blog.csdn.net/chenleixing/article/details/44994571
最近在忙著優(yōu)化集團(tuán)公司的一個報表。優(yōu)化完成后，報表查詢速度有從半小時以上(甚至查不出)到秒查的質(zhì)變。從修改SQL查詢語句邏輯到?jīng)Q定創(chuàng)建存儲過程實現(xiàn)，花了我3天多的時間，在此總結(jié)一下，希望對朋友們有幫助。
數(shù)據(jù)背景
首先項目是西門子中國在我司實施部署的MES項目，由于項目是在產(chǎn)線上運(yùn)作(3 years+)，數(shù)據(jù)累積很大。在項目的數(shù)據(jù)庫中，大概上億條數(shù)據(jù)的表有5個以上，千萬級數(shù)據(jù)的表10個以上，百萬級數(shù)據(jù)的表，很多…
(歷史問題，當(dāng)初實施無人監(jiān)管，無人監(jiān)控數(shù)據(jù)庫這塊的性能問題。ps:我剛?cè)肼毑痪谩?
不多說，直接貼西門子中國的開發(fā)人員在我司開發(fā)的SSRS報表中的SQL語句：
select distinct b.MaterialID as matl_def_id, c.Descript, case when right(b.MESOrderID, 12) < '001000000000' then right(b.MESOrderID, 9)
else right(b.MESOrderID, 12) end as pom_order_id, a.LotName, a.SourceLotName as ComLot,
e.DefID as ComMaterials, e.Descript as ComMatDes, d.VendorID, d.DateCode,d.SNNote, b.OnPlantID,a.SNCUST
from
(
select m.lotname, m.sourcelotname, m.opetypeid, m.OperationDate,n.SNCUST from View1 m
left join co_sn_link_customer as n on n.SNMes=m.LotName
where
( m.LotName in (select val from fn_String_To_Table(@sn,',',1)) or (@sn) = '') and
( m.sourcelotname in (select val from fn_String_To_Table(@BatchID,',',1)) or (@BatchID) = '')
and (n.SNCust like '%'+ @SN_ext + '%' or (@SN_ext)='')
) a
left join
(
select * from Table1 where SNType = 'IntSN'
and SNRuleName = 'ProductSNRule'
and OnPlantID=@OnPlant
) b on b.SN = a.LotName
inner join MMdefinitions as c on c.DefID = b.MaterialID
left join Table1 as d on d.SN = a.SourceLotName
inner join MMDefinitions as e on e.DefID = d.MaterialID
where not exists (
select distinct LotName, SourceLotName from ELCV_ASSEMBLE_OPS
where LotName = a.SourceLotName and SourceLotName = a.LotName
)
and (d.DateCode in (select val from fn_String_To_Table(@DCode,',',1)) or (@DCode) = '')
and (d.SNNote like '%'+@SNNote+'%' or (@SNNote) = '')
and ((case when right(b.MESOrderID, 12) < '001000000000' then right(b.MESOrderID, 9)
else right(b.MESOrderID, 12) end) in (select val from fn_String_To_Table(@order_id,',',1)) or (@order_id) = '')
and (e.DefID in (select val from fn_String_To_Table(@comdef,',',1)) or (@comdef) = '')
--View1是一個嵌套兩層的視圖(出于保密性，實際名稱可能不同)，里面有一張上億數(shù)據(jù)的表和幾張千萬級數(shù)據(jù)的表做左連接查詢
--Table1是一個數(shù)據(jù)記錄超過1500萬的表
這個查詢語句，實際上通過我的檢測和調(diào)查，在B/S系統(tǒng)前端已無法查出結(jié)果，半小時，一小時 … 。因為我直接在SQL查詢分析器查，半小時都沒有結(jié)果。
(原因是里面對一張上億級數(shù)據(jù)表和3張千萬級數(shù)據(jù)表做全表掃描查詢)
不由感慨，西門子中國的素質(zhì)(或者說責(zé)任感)就這樣？
下面說說我的分析和走的彎路(思維誤區(qū))，希望對你也有警醒。
探索和誤區(qū)
首先相關(guān)表的索引，沒有建全的，把索引給建上。
索引這步完成后，發(fā)現(xiàn)情況還是一樣，查詢速度幾乎沒有改善。后來想起相關(guān)千萬級數(shù)據(jù)以上的表，都還沒有建立表分區(qū)。于是考慮建立表分區(qū)以及數(shù)據(jù)復(fù)制的方案。
這里有必要說明下：我司報表用的是一個專門的數(shù)據(jù)庫服務(wù)器，數(shù)據(jù)從產(chǎn)線訂閱而來。就是常說的“讀寫分離”。
如果直接在原表上建立表分區(qū)，你會發(fā)現(xiàn)執(zhí)行表分區(qū)的事物會直接死鎖。原因是：表分區(qū)操作本身會鎖表，產(chǎn)線還在推數(shù)據(jù)過來，這樣很容易“阻塞”，“死鎖”。
我想好的方案是：建立一個新表(空表)，在新表上建好表分區(qū)，然后復(fù)制數(shù)據(jù)過來。
正打算這么干。等等！我好像進(jìn)入了一個嚴(yán)重的誤區(qū)！
分析：原SQL語句和業(yè)務(wù)需求，是對產(chǎn)線的數(shù)據(jù)做產(chǎn)品以及序列號的追溯，關(guān)鍵是查詢條件里沒有有規(guī)律的”條件”(如日期、編號)，
貿(mào)然做了表分區(qū)，在這里幾乎沒有意義！反而會降低查詢性能！
好險！還是一步一步來，先做SQL語句分析。搜索Java知音公眾號，回復(fù)“后端面試”，送你一份Java面試題寶典
一. 對原SQL語句的分析
查詢語句的where條件，有大量@var in … or (@var =”) 的片段
where條件有l(wèi)ike ‘%’+@var+’%’
where條件有 case … end 函數(shù)
多次連接同一表查詢，另外使用本身已嵌套的視圖表，是不是必須，是否可替代？
SQL語句有號，視圖中也有號出現(xiàn)
二. 優(yōu)化設(shè)計
首先是用存儲過程改寫，好處是設(shè)計靈活。
核心思想是：用一個或多個查詢條件(查詢條件要求至少輸入一個)得到臨時表，每個查詢條件如果查到集合，就更新這張臨時表，最后匯總的時候，只需判斷這個臨時表是否有值。以此類推，可以建立多個臨時表，將查詢條件匯總。
這樣做目前來看至少兩點好處：
省去了對變量進(jìn)行 =@var or (@var=”)的判斷；
拋棄sql拼接，提高代碼可讀性。
再有就是在書寫存儲過程，這個過程中要注意：
盡量想辦法使用臨時表掃描替代全表掃描；
拋棄in和not in語句，使用exists和not exists替代；
和客戶確認(rèn)，模糊查詢是否有必要，如沒有必要，去掉like語句；
注意建立適當(dāng)?shù)模蠄鼍暗乃饕?/p>
踩死 “*” 號；
避免在where條件中對字段進(jìn)行函數(shù)操作；
對實時性要求不高的報表，允許臟讀(with(nolock))。
三. 存儲過程
如果想?yún)⒖純?yōu)化設(shè)計片段的詳細(xì)內(nèi)容，請參閱SQL代碼：
/**
* 某某跟蹤報表
**/
--exec spName1 '','','','','','','公司代號'
CREATE Procedure spName1
@MESOrderID nvarchar(320), --工單號,最多30個
@LotName nvarchar(700), --產(chǎn)品序列號,最多50個
@DateCode nvarchar(500), --供應(yīng)商批次號,最多30個
@BatchID nvarchar(700), --組裝件序列號/物料批號,最多50個
@comdef nvarchar(700), --組裝件物料編碼,最多30個
@SNCust nvarchar(1600), --外部序列號,最多50個
@OnPlant nvarchar(20) --平臺
AS
BEGIN
SET NOCOUNT ON;
/**
* 1)定義全局的臨時表，先根據(jù)六個查詢條件的任意一個，得出臨時表結(jié)果
**/
CREATE TABLE #FinalLotName
(
LotName NVARCHAR(50), --序列號
SourceLotName NVARCHAR(50), --來源序列號
SNCust NVARCHAR(128) --外部序列號
)
--1.1
IF @LotName<>''
BEGIN
SELECT Val INTO #WorkLot FROM fn_String_To_Table(@LotName,',',1)
SELECT LotPK,LotName INTO #WorkLotPK FROM MMLots WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkLot b WHERE b.Val=MMLots.LotID)
--求SourceLotPK只能在這里求
SELECT a.LotPK,a.SourceLotPK into #WorkSourcePK FROM MMLotOperations a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkLotPK b WHERE b.LotPK=a.LotPK) AND a.SourceLotPK IS NOT NULL
SELECT a.LotPK,a.SourceLotPK,b.LotName INTO #WorkSourcePK2 FROM #WorkSourcePK a JOIN #WorkLotPK b ON a.LotPK=b.LotPK
INSERT INTO #FinalLotName SELECT a.LotName,b.LotName AS SourceLotName,NULL FROM #WorkSourcePK2 a JOIN (SELECT LotPK,LotName FROM MMLots WITH(NOLOCK) ) b on a.SourceLotPK=b.LotPK --b的里面加不加WHERE RowDeleted=0待確定
SELECT a.LotName,a.SourceLotName,b.SNCust INTO #FinalLotNameX1 FROM #FinalLotName a LEFT JOIN CO_SN_LINK_CUSTOMER b WITH(NOLOCK) ON a.LotName=b.SNMes
DELETE FROM #FinalLotName
INSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #FinalLotNameX1
END
--1.2
IF @BatchID<>''
BEGIN
SELECT Val INTO #WorkSourceLot FROM fn_String_To_Table(@BatchID,',',1)
IF EXISTS(SELECT 1 FROM #FinalLotName)--如果@LotName也不為空
BEGIN
SELECT a.LotName,a.SourceLotName,a.SNCust INTO #FinalLotNameX2 FROM #FinalLotName a WHERE EXISTS(SELECT 1 FROM #WorkSourceLot b WHERE a.SourceLotName=b.Val)
DELETE FROM #FinalLotName
INSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #FinalLotNameX2
END
ELSE --@LotName條件為空
BEGIN
SELECT LotPK AS SourceLotPK,LotName AS SourceLotName INTO #2 FROM MMLots WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkSourceLot b WHERE b.Val=MMLots.LotID)
SELECT a.LotPK,a.SourceLotPK into #21 FROM MMLotOperations a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #2 b WHERE b.SourceLotPK=a.SourceLotPK)
SELECT a.LotPK,a.SourceLotPK,b.SourceLotName INTO #22 FROM #21 a JOIN #2 b ON a.SourceLotPK=b.SourceLotPK
INSERT INTO #FinalLotName SELECT b.LotName,a.SourceLotName,NULL FROM #22 a JOIN (SELECT LotPK,LotName FROM MMLots WITH(NOLOCK) ) b on a.LotPK=b.LotPK --b的里面加不加WHERE RowDeleted=0待確定
SELECT a.LotName,a.SourceLotName,b.SNCust INTO #FinalLotNameX21 FROM #FinalLotName a LEFT JOIN CO_SN_LINK_CUSTOMER b WITH(NOLOCK) ON a.LotName=b.SNMes
DELETE FROM #FinalLotName
INSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #FinalLotNameX21
END
END
--1.3
IF @SNCust<>''
BEGIN
SELECT Val INTO #WorkCustomSN FROM fn_String_To_Table(@SNCust,',',1)
IF EXISTS(SELECT 1 FROM #FinalLotName)--前面兩個條件至少有一個有值
BEGIN
SELECT a.LotName,a.SourceLotName,a.SNCust INTO #FinalLotNameX3 FROM #FinalLotName a WHERE EXISTS(SELECT 1 FROM #WorkCustomSN b WHERE a.SNCust=b.Val)
DELETE FROM #FinalLotName
INSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #FinalLotNameX3
END
ELSE
BEGIN
SELECT a.SNMes INTO #WorkLotX FROM CO_SN_LINK_CUSTOMER a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkCustomSN b WHERE a.SNCust=b.Val)
-------------------以下邏輯和變量1(@LotName)類似[先根據(jù)外部序列號求解序列號,再照搬第一個判斷變量的方式]
SELECT LotPK,LotName INTO #WorkLotPKX FROM MMLots WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkLotX b WHERE b.SNMes=MMLots.LotID)
--求SourceLotPK只能在這里求
SELECT a.LotPK,a.SourceLotPK into #WorkSourcePKX FROM MMLotOperations a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkLotPKX b WHERE b.LotPK=a.LotPK) AND a.SourceLotPK IS NOT NULL
SELECT a.LotPK,a.SourceLotPK,b.LotName INTO #WorkSourcePK2X FROM #WorkSourcePKX a JOIN #WorkLotPKX b ON a.LotPK=b.LotPK
INSERT INTO #FinalLotName SELECT a.LotName,b.LotName AS SourceLotName,NULL FROM #WorkSourcePK2X a JOIN (SELECT LotPK,LotName FROM MMLots WITH(NOLOCK) ) b on a.SourceLotPK=b.LotPK --b的里面加不加WHERE RowDeleted=0待確定
SELECT a.LotName,a.SourceLotName,b.SNCust INTO #FinalLotNameX31 FROM #FinalLotName a LEFT JOIN CO_SN_LINK_CUSTOMER b WITH(NOLOCK) ON a.LotName=b.SNMes
DELETE FROM #FinalLotName
INSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #FinalLotNameX31
-----------------------
END
END
/**
* 2)定義全局的臨時表，用于替換第一個全局臨時表。
**/
CREATE TABLE #FinalCO_SN
(
SN NVARCHAR(50),
SourceSN NVARCHAR(50),
SNCust NVARCHAR(128),
matl_def_id NVARCHAR(50),--sn的物料ID
ComMaterials NVARCHAR(50), --SourceSN的物料ID
MESOrderID NVARCHAR(20),
OnPlantID NVARCHAR(20),
VendorID NVARCHAR(20),
DateCode NVARCHAR(20) ,
SNNote NVARCHAR(512)
)
--2.1
IF @MESOrderID<>''
BEGIN
-------------------------------將MESOrderID做特殊處理-----------------------------------
SELECT Val INTO #WorkMESOrderID FROM fn_String_To_Table(@MESOrderID,',',1)
IF @OnPlant='Comba'
BEGIN
UPDATE #WorkMESOrderID SET Val='C000'+Val WHERE LEN(Val)=9
END
ELSE
BEGIN
UPDATE #WorkMESOrderID SET Val='W000'+Val WHERE LEN(Val)=9
END
SELECT SN,MaterialID,MESOrderID,OnPlantID INTO #WorkCO_SN1 FROM CO_SN_GENERATION a WITH(NOLOCK)
WHERE SNType='IntSN' AND SNRuleName = 'ProductSNRule' AND OnPlantID=@OnPlant
AND EXISTS(SELECT 1 FROM #WorkMESOrderID b WHERE a.MESOrderID=b.Val)
------------------------------------------------------------------------------------------
--條件判斷(邏輯分析)開始
IF EXISTS(SELECT 1 FROM #FinalLotName)--如果前面判斷的查詢條件有值
BEGIN
--查出SourceLotName對應(yīng)的查詢字段
SELECT a.SN AS SourceLotName,a.VendorID,a.DateCode,a.SNNote,a.MaterialID AS ComMaterials INTO #SourceLotNameTable FROM CO_SN_GENERATION a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.SourceLotName)
INSERT INTO #FinalCO_SN
SELECT a.LotName,a.SourceLotName,d.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote FROM #FinalLotName a
LEFT JOIN #WorkCO_SN1 b ON a.LotName=b.SN
LEFT JOIN #SourceLotNameTable c ON a.SourceLotName=c.SourceLotName
LEFT JOIN CO_SN_LINK_CUSTOMER d WITH(NOLOCK) ON a.LotName=d.SNMes
END
ELSE
BEGIN
--已知SN集合求解對應(yīng)的SourceSN和SNCust集合------------------------------------------
SELECT LotPK,LotName INTO #WorkLotPK410 FROM MMLots WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkCO_SN1 b WHERE b.SN=MMLots.LotID)
SELECT a.LotPK,a.SourceLotPK into #WorkSourcePK420 FROM MMLotOperations a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkLotPK410 b WHERE b.LotPK=a.LotPK) AND a.SourceLotPK IS NOT NULL
SELECT a.LotPK,a.SourceLotPK,b.LotName INTO #WorkSourcePK430 FROM #WorkSourcePK420 a JOIN #WorkLotPK410 b ON a.LotPK=b.LotPK
INSERT INTO #FinalLotName SELECT a.LotName,b.LotName AS SourceLotName,NULL FROM #WorkSourcePK430 a JOIN (SELECT LotPK,LotName FROM MMLots WITH(NOLOCK) ) b on a.SourceLotPK=b.LotPK --b的里面加不加WHERE RowDeleted=0待確定
SELECT a.LotName,a.SourceLotName,b.SNCust INTO #FinalLotNameX440 FROM #FinalLotName a LEFT JOIN CO_SN_LINK_CUSTOMER b WITH(NOLOCK) ON a.LotName=b.SNMes
DELETE FROM #FinalLotName
INSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #FinalLotNameX440
-------------------------------------------------------------------------------------
SELECT a.SN AS SourceLotName,a.VendorID,a.DateCode,a.SNNote,a.MaterialID AS ComMaterials INTO #SourceLotNameTable2 FROM CO_SN_GENERATION a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.SourceLotName)
INSERT INTO #FinalCO_SN
SELECT a.LotName,a.SourceLotName,a.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote FROM #FinalLotName a
LEFT JOIN #WorkCO_SN1 b ON a.LotName=b.SN
LEFT JOIN #SourceLotNameTable2 c ON a.SourceLotName=c.SourceLotName
END
END
--2.2
IF @DateCode<>''
BEGIN
SELECT Val INTO #WorkDateCode FROM fn_String_To_Table(@DateCode,',',1)
--此@DataCode條件求解出來的是SourceSN
SELECT SN AS SourceSN,MaterialID AS ComMaterials,VendorID,DateCode,SNNote INTO #WorkSourceSNT1 FROM CO_SN_GENERATION a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkDateCode b WHERE a.DateCode=b.Val)
----------------------------------------------------------------------------------------------------
--條件判斷(邏輯分析)開始
IF EXISTS(SELECT 1 FROM #FinalCO_SN)--如果前面判斷的查詢條件有值
BEGIN
SELECT a.LotName,a.SourceLotName,a.SNCust,a.MaterialID,a.ComMaterials,a.MESOrderID,a.OnPlantID,a.VendorID,a.DateCode,a.SNNote INTO #TMP51 FROM #FinalCO_SN a WHERE EXISTS (SELECT 1 FROM #WorkDateCode b WHERE a.DateCode=b.Val)
DELETE FROM #FinalCO_SN
INSERT INTO #FinalCO_SN SELECT LotName,SourceLotName,SNCust,MaterialID,ComMaterials,MESOrderID,OnPlantID,VendorID,DateCode,SNNote FROM #TMP51
END
ELSE
BEGIN
IF EXISTS(SELECT 1 FROM #FinalLotName)
BEGIN
--查出SourceLotName對應(yīng)的查詢字段
SELECT a.SourceSN,a.VendorID,a.DateCode,a.SNNote,a.ComMaterials INTO #SourceLTX5 FROM #WorkSourceSNT1 a WHERE EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SourceSN=b.SourceLotName)
--查出SN對應(yīng)的查詢字段
SELECT SN,MaterialID,MESOrderID,OnPlantID INTO #WorkSNT510 FROM CO_SN_GENERATION a WITH(NOLOCK)
WHERE SNType='IntSN' AND SNRuleName = 'ProductSNRule' AND OnPlantID=@OnPlant
AND EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.LotName)
INSERT INTO #FinalCO_SN
SELECT a.LotName,a.SourceLotName,d.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote FROM #FinalLotName a
LEFT JOIN #WorkSNT510 b ON a.LotName=b.SN
LEFT JOIN #WorkSourceSNT1 c ON a.SourceLotName=c.SourceSN
LEFT JOIN CO_SN_LINK_CUSTOMER d WITH(NOLOCK) ON a.LotName=d.SNMes
END
ELSE
BEGIN
--已知SourceSN集合求解對應(yīng)的SN和SNCust集合------------------------------------------
SELECT LotPK AS SourceLotPK,LotName AS SrouceLotName INTO #WorkLotX510 FROM MMLots WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkSourceSNT1 b WHERE b.SourceSN=MMLots.LotID)
SELECT a.LotPK,a.SourceLotPK into #WorkLotX520 FROM MMLotOperations a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkLotX510 b WHERE b.SourceLotPK=a.SourceLotPK)
SELECT a.LotPK,a.SourceLotPK,b.SrouceLotName INTO #WorkLotX530 FROM #WorkLotX520 a JOIN #WorkLotX510 b ON a.SourceLotPK=b.SourceLotPK
INSERT INTO #FinalLotName SELECT b.LotName,a.SrouceLotName,NULL FROM #WorkLotX530 a JOIN (SELECT LotPK,LotName FROM MMLots WITH(NOLOCK) ) b on a.LotPK=b.LotPK --b的里面加不加WHERE RowDeleted=0待確定
SELECT a.LotName,a.SourceLotName,b.SNCust INTO #WorkLotX540 FROM #FinalLotName a LEFT JOIN CO_SN_LINK_CUSTOMER b WITH(NOLOCK) ON a.LotName=b.SNMes
DELETE FROM #FinalLotName
INSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #WorkLotX540
-------------------------------------------------------------------------------------
SELECT SN,MaterialID,MESOrderID,OnPlantID INTO #WorkLotX550 FROM CO_SN_GENERATION a WITH(NOLOCK)
WHERE SNType='IntSN' AND SNRuleName = 'ProductSNRule' AND OnPlantID=@OnPlant
AND EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.LotName)
INSERT INTO #FinalCO_SN
SELECT a.LotName,a.SourceLotName,a.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote FROM #FinalLotName a
LEFT JOIN #WorkLotX550 b ON a.LotName=b.SN
LEFT JOIN #WorkSourceSNT1 c ON a.SourceLotName=c.SourceSN
END
END
END
--2.3
IF @comdef<>''
BEGIN
SELECT Val INTO #WorkComdef FROM fn_String_To_Table(@comdef,',',1)
--此@comdef條件求解出來的是SourceSN
SELECT SN AS SourceSN,MaterialID AS ComMaterials,VendorID,DateCode,SNNote INTO #WorkSourceSNT16 FROM CO_SN_GENERATION a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkComdef b WHERE a.MaterialID=b.Val)
----------------------------------------------------------------------------------------------------
--條件判斷(邏輯分析)開始
IF EXISTS(SELECT 1 FROM #FinalCO_SN)--如果前面判斷的查詢條件有值
BEGIN
SELECT a.LotName,a.SourceLotName,a.SNCust,a.MaterialID,a.ComMaterials,a.MESOrderID,a.OnPlantID,a.VendorID,a.DateCode,a.SNNote INTO #TMP516 FROM #FinalCO_SN a WHERE EXISTS (SELECT 1 FROM #WorkComdef b WHERE a.matl_def_id=b.Val)
DELETE FROM #FinalCO_SN
INSERT INTO #FinalCO_SN SELECT LotName,SourceLotName,SNCust,MaterialID,ComMaterials,MESOrderID,OnPlantID,VendorID,DateCode,SNNote FROM #TMP516
END
ELSE
BEGIN
IF EXISTS(SELECT 1 FROM #FinalLotName)
BEGIN
--查出SourceLotName對應(yīng)的查詢字段
SELECT a.SourceSN,a.VendorID,a.DateCode,a.SNNote,a.ComMaterials INTO #SourceLTX56 FROM #WorkSourceSNT16 a WHERE EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SourceSN=b.SourceLotName)
--查出SN對應(yīng)的查詢字段
SELECT SN,MaterialID,MESOrderID,OnPlantID INTO #WorkSNT5106 FROM CO_SN_GENERATION a WITH(NOLOCK)
WHERE SNType='IntSN' AND SNRuleName = 'ProductSNRule' AND OnPlantID=@OnPlant
AND EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.LotName)
INSERT INTO #FinalCO_SN
SELECT a.LotName,a.SourceLotName,d.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote FROM #FinalLotName a
LEFT JOIN #WorkSNT5106 b ON a.LotName=b.SN
LEFT JOIN #WorkSourceSNT16 c ON a.SourceLotName=c.SourceSN
LEFT JOIN CO_SN_LINK_CUSTOMER d WITH(NOLOCK) ON a.LotName=d.SNMes
END
ELSE
BEGIN
--已知SourceSN集合求解對應(yīng)的SN和SNCust集合------------------------------------------
SELECT LotPK AS SourceLotPK,LotName AS SrouceLotName INTO #WorkLotX5106 FROM MMLots WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkSourceSNT16 b WHERE b.SourceSN=MMLots.LotID)
SELECT a.LotPK,a.SourceLotPK into #WorkLotX5206 FROM MMLotOperations a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #WorkLotX5106 b WHERE b.SourceLotPK=a.SourceLotPK)
SELECT a.LotPK,a.SourceLotPK,b.SrouceLotName INTO #WorkLotX5306 FROM #WorkLotX5206 a JOIN #WorkLotX5106 b ON a.SourceLotPK=b.SourceLotPK
INSERT INTO #FinalLotName SELECT b.LotName,a.SrouceLotName,NULL FROM #WorkLotX5306 a JOIN (SELECT LotPK,LotName FROM MMLots WITH(NOLOCK) ) b on a.LotPK=b.LotPK --b的里面加不加WHERE RowDeleted=0待確定
SELECT a.LotName,a.SourceLotName,b.SNCust INTO #WorkLotX5406 FROM #FinalLotName a LEFT JOIN CO_SN_LINK_CUSTOMER b WITH(NOLOCK) ON a.LotName=b.SNMes
DELETE FROM #FinalLotName
INSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #WorkLotX5406
-------------------------------------------------------------------------------------
SELECT SN,MaterialID,MESOrderID,OnPlantID INTO #WorkLotX5506 FROM CO_SN_GENERATION a WITH(NOLOCK)
WHERE SNType='IntSN' AND SNRuleName = 'ProductSNRule' AND OnPlantID=@OnPlant
AND EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.LotName)
INSERT INTO #FinalCO_SN
SELECT a.LotName,a.SourceLotName,a.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote FROM #FinalLotName a
LEFT JOIN #WorkLotX5506 b ON a.LotName=b.SN
LEFT JOIN #WorkSourceSNT16 c ON a.SourceLotName=c.SourceSN
END
END
END
/**
* 3)條件判斷結(jié)束
**/
IF EXISTS(SELECT 1 FROM #FinalLotName)
BEGIN
IF EXISTS(SELECT 1 FROM #FinalCO_SN)
BEGIN--3.1
SELECT a.matl_def_id,b.Descript,a.MESOrderID AS pom_order_id,a.SN AS LotName,a.SourceSN AS ComLot,
a.ComMaterials,c.Descript AS ComMatDes,a.VendorID,a.DateCode,a.SNNote,
OnPlantID,SNCust FROM #FinalCO_SN a
JOIN MMDefinitions b WITH(NOLOCK) ON a.matl_def_id=b.DefID
JOIN MMDefinitions c WITH(NOLOCK) ON a.ComMaterials=c.DefID
WHERE NOT EXISTS(select distinct SN, SourceSN from #FinalCO_SN x
where x.SN = a.SourceSN and x.SourceSN = a.SN)
END
ELSE
BEGIN--3.2
--3.2.1求解SN的必查字段
SELECT SN,MaterialID,MESOrderID,OnPlantID INTO #FinalSNX1 FROM CO_SN_GENERATION a WITH(NOLOCK)
WHERE SNType='IntSN' AND SNRuleName = 'ProductSNRule' AND OnPlantID=@OnPlant
AND EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.LotName)
--3.2.2求解SourceSN的必查字段
SELECT a.SN AS SourceLotName,a.VendorID,a.DateCode,a.SNNote,a.MaterialID AS ComMaterials INTO #FinalSNX2 FROM CO_SN_GENERATION a WITH(NOLOCK) WHERE EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.SourceLotName)
SELECT b.MaterialID AS matl_def_id,x.Descript,b.MESOrderID AS pom_order_id,b.SN AS LotName,c.SourceLotName AS ComLot,c.ComMaterials,y.Descript AS ComMatDes,c.VendorID,c.DateCode,c.SNNote,b.OnPlantID,a.SNCust
FROM #FinalLotName a
LEFT JOIN #FinalSNX1 b ON a.LotName=b.SN
LEFT JOIN #FinalSNX2 c ON a.SourceLotName=c.SourceLotName
JOIN MMDefinitions x WITH(NOLOCK) ON b.MaterialID=x.DefID
JOIN MMDefinitions y WITH(NOLOCK) ON c.ComMaterials=y.DefID
WHERE NOT EXISTS(
SELECT DISTINCT * FROM #FinalLotName z
WHERE z.LotName=a.SourceLotName and z.SourceLotName=a.LotName
)
END
END
ELSE
BEGIN
IF EXISTS(SELECT 1 FROM #FinalCO_SN)
BEGIN--3.3
SELECT a.matl_def_id,b.Descript,a.MESOrderID AS pom_order_id,a.SN AS LotName,a.SourceSN AS ComLot,
a.ComMaterials,c.Descript AS ComMatDes,a.VendorID,a.DateCode,a.SNNote,
OnPlantID,SNCust FROM #FinalCO_SN a
JOIN MMDefinitions b WITH(NOLOCK) ON a.matl_def_id=b.DefID
JOIN MMDefinitions c WITH(NOLOCK) ON a.ComMaterials=c.DefID
WHERE NOT EXISTS(select distinct SN, SourceSN from #FinalCO_SN x
where x.SN = a.SourceSN and x.SourceSN = a.SN)
END
ELSE
BEGIN--3.4
PRINT 'There is no queryable condition,please enter at less a query conditon.'
END
END
END
GO
雖然犧牲了代碼的可讀性，但創(chuàng)造了性能價值。本人水平有限，還請各位不吝賜教！
最后，將SSRS報表替換成此存儲過程后，SQL查詢分析器是秒查的。B/S前端用時1~2秒！
四. 總結(jié)
平常的你是否偶爾會因急于完成任務(wù)而書寫一堆性能極低的SQL語句呢？寫出可靠性能的SQL語句不難，難的是習(xí)慣。
本文的優(yōu)化思想很簡單，關(guān)鍵點是避免全表掃描 & 注重SQL語句寫法 & 索引，另外，如果你查詢的表有可能會在查詢時段更新，而實際業(yè)務(wù)需求允許臟讀，可加with(nolock)預(yù)防查詢被更新事物阻塞。
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