數(shù)據(jù)背景

首先項(xiàng)目是西門子中國(guó)在我司實(shí)施部署的MES項(xiàng)目，由于項(xiàng)目是在產(chǎn)線上運(yùn)作(3 years+)，數(shù)據(jù)累積很大。在項(xiàng)目的數(shù)據(jù)庫(kù)中，大概上億條數(shù)據(jù)的表有5個(gè)以上，千萬(wàn)級(jí)數(shù)據(jù)的表10個(gè)以上，百萬(wàn)級(jí)數(shù)據(jù)的表，很多…

(歷史問(wèn)題，當(dāng)初實(shí)施無(wú)人監(jiān)管，無(wú)人監(jiān)控?cái)?shù)據(jù)庫(kù)這塊的性能問(wèn)題。)

不多說(shuō)，直接貼西門子中國(guó)的開(kāi)發(fā)人員在我司開(kāi)發(fā)的SSRS報(bào)表中的SQL語(yǔ)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 mleft join co_sn_link_customer as n on n.SNMes=m.LotNamewhere ( 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(gè)嵌套兩層的視圖(出于保密性，實(shí)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(wàn)級(jí)數(shù)據(jù)的表做左連接查詢 --Table1是一個(gè)數(shù)據(jù)記錄超過(guò)1500萬(wàn)的表

這個(gè)查詢語(yǔ)句，實(shí)際上通過(guò)我的檢測(cè)和調(diào)查，在B/S系統(tǒng)前端已無(wú)法查出結(jié)果，半小時(shí)，一小時(shí) … 。因?yàn)槲抑苯釉赟QL查詢分析器查，半小時(shí)都沒(méi)有結(jié)果。

(原因是里面對(duì)一張上億級(jí)數(shù)據(jù)表和3張千萬(wàn)級(jí)數(shù)據(jù)表做全表掃描查詢)

不由感慨，西門子中國(guó)的素質(zhì)(或者說(shuō)責(zé)任感)就這樣？

下面說(shuō)說(shuō)我的分析和走的彎路(思維誤區(qū))，希望對(duì)你也有警醒。

探索和誤區(qū)

首先相關(guān)表的索引，沒(méi)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(méi)有改善。后來(lái)想起相關(guān)千萬(wàn)級(jí)數(shù)據(jù)以上的表，都還沒(méi)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(shuō)明下：我司報(bào)表用的是一個(gè)專門的數(shù)據(jù)庫(kù)服務(wù)器，數(shù)據(jù)從產(chǎn)線訂閱而來(lái)。就是常說(shuō)的“讀寫分離”。

如果直接在原表上建立表分區(qū)，你會(huì)發(fā)現(xiàn)執(zhí)行表分區(qū)的事物會(huì)直接死鎖。原因是：表分區(qū)操作本身會(huì)鎖表，產(chǎn)線還在推數(shù)據(jù)過(guò)來(lái)，這樣很容易“阻塞”，“死鎖”。

我想好的方案是：建立一個(gè)新表(空表)，在新表上建好表分區(qū)，然后復(fù)制數(shù)據(jù)過(guò)來(lái)。

正打算這么干。等等！我好像進(jìn)入了一個(gè)嚴(yán)重的誤區(qū)！

分析：原SQL語(yǔ)句和業(yè)務(wù)需求，是對(duì)產(chǎn)線的數(shù)據(jù)做產(chǎn)品以及序列號(hào)的追溯，關(guān)鍵是查詢條件里沒(méi)有有規(guī)律的”條件”(如日期、編號(hào))，貿(mào)然做了表分區(qū)，在這里幾乎沒(méi)有意義！反而會(huì)降低查詢性能！

好險(xiǎn)！還是一步一步來(lái)，先做SQL語(yǔ)句分析

一. 對(duì)原SQL語(yǔ)句的分析

查詢語(yǔ)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(yǔ)句有號(hào)，視圖中也有號(hào)出現(xiàn)

二. 優(yōu)化設(shè)計(jì)

首先是用存儲(chǔ)過(guò)程改寫，好處是設(shè)計(jì)靈活。

核心思想是：用一個(gè)或多個(gè)查詢條件(查詢條件要求至少輸入一個(gè))得到臨時(shí)表，每個(gè)查詢條件如果查到集合，就更新這張臨時(shí)表，最后匯總的時(shí)候，只需判斷這個(gè)臨時(shí)表是否有值。以此類推，可以建立多個(gè)臨時(shí)表，將查詢條件匯總。

這樣做目前來(lái)看至少兩點(diǎn)好處：

省去了對(duì)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(shū)寫存儲(chǔ)過(guò)程，這個(gè)過(guò)程中要注意：

盡量想辦法使用臨時(shí)表掃描替代全表掃描；

拋棄in和not in語(yǔ)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(méi)有必要，去掉like語(yǔ)句；

注意建立適當(dāng)?shù)?#xff0c;符合場(chǎng)景的索引；

踩死 “*” 號(hào)；

避免在where條件中對(duì)字段進(jìn)行函數(shù)操作；

對(duì)實(shí)時(shí)性要求不高的報(bào)表，允許臟讀(with(nolock))。

三. 存儲(chǔ)過(guò)程

如果想?yún)⒖純?yōu)化設(shè)計(jì)片段的詳細(xì)內(nèi)容，請(qǐng)參閱SQL代碼：

/*** 某某跟蹤報(bào)表**/ --exec spName1 '','','','','','','公司代號(hào)' CREATE Procedure spName1@MESOrderID nvarchar(320), --工單號(hào),最多30個(gè)@LotName nvarchar(700), --產(chǎn)品序列號(hào),最多50個(gè)@DateCode nvarchar(500), --供應(yīng)商批次號(hào),最多30個(gè)@BatchID nvarchar(700), --組裝件序列號(hào)/物料批號(hào),最多50個(gè)@comdef nvarchar(700), --組裝件物料編碼,最多30個(gè)@SNCust nvarchar(1600), --外部序列號(hào),最多50個(gè)@OnPlant nvarchar(20) --平臺(tái) AS BEGINSET NOCOUNT ON; /*** 1)定義全局的臨時(shí)表，先根據(jù)六個(gè)查詢條件的任意一個(gè)，得出臨時(shí)表結(jié)果**/CREATE TABLE #FinalLotName(LotName NVARCHAR(50), --序列號(hào)SourceLotName NVARCHAR(50), --來(lái)源序列號(hào)SNCust NVARCHAR(128) --外部序列號(hào))--1.1IF @LotName<>''BEGINSELECT 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 NULLSELECT a.LotPK,a.SourceLotPK,b.LotName INTO #WorkSourcePK2 FROM #WorkSourcePK a JOIN #WorkLotPK b ON a.LotPK=b.LotPKINSERT 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.SNMesDELETE FROM #FinalLotNameINSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #FinalLotNameX1END--1.2IF @BatchID<>''BEGINSELECT Val INTO #WorkSourceLot FROM fn_String_To_Table(@BatchID,',',1)IF EXISTS(SELECT 1 FROM #FinalLotName)--如果@LotName也不為空BEGINSELECT 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 #FinalLotNameINSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #FinalLotNameX2ENDELSE --@LotName條件為空BEGINSELECT 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.SNMesDELETE FROM #FinalLotNameINSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #FinalLotNameX21 ENDEND--1.3IF @SNCust<>''BEGINSELECT Val INTO #WorkCustomSN FROM fn_String_To_Table(@SNCust,',',1)IF EXISTS(SELECT 1 FROM #FinalLotName)--前面兩個(gè)條件至少有一個(gè)有值BEGINSELECT 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 #FinalLotNameX3ENDELSEBEGINSELECT 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(hào)求解序列號(hào),再照搬第一個(gè)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 NULLSELECT a.LotPK,a.SourceLotPK,b.LotName INTO #WorkSourcePK2X FROM #WorkSourcePKX a JOIN #WorkLotPKX b ON a.LotPK=b.LotPKINSERT 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.SNMesDELETE FROM #FinalLotNameINSERT INTO #FinalLotName SELECT LotName,SourceLotName,SNCust FROM #FinalLotNameX31-----------------------ENDEND/*** 2)定義全局的臨時(shí)表，用于替換第一個(gè)全局臨時(shí)表。**/CREATE TABLE #FinalCO_SN(SN NVARCHAR(50),SourceSN NVARCHAR(50),SNCust NVARCHAR(128),matl_def_id NVARCHAR(50),--sn的物料IDComMaterials NVARCHAR(50), --SourceSN的物料IDMESOrderID NVARCHAR(20),OnPlantID NVARCHAR(20),VendorID NVARCHAR(20),DateCode NVARCHAR(20) ,SNNote NVARCHAR(512))--2.1IF @MESOrderID<>''BEGIN-------------------------------將MESOrderID做特殊處理-----------------------------------SELECT Val INTO #WorkMESOrderID FROM fn_String_To_Table(@MESOrderID,',',1)IF @OnPlant='Comba'BEGINUPDATE #WorkMESOrderID SET Val='C000'+Val WHERE LEN(Val)=9ENDELSEBEGINUPDATE #WorkMESOrderID SET Val='W000'+Val WHERE LEN(Val)=9ENDSELECT SN,MaterialID,MESOrderID,OnPlantID INTO #WorkCO_SN1 FROM CO_SN_GENERATION a WITH(NOLOCK)WHERE SNType='IntSN' AND SNRuleName = 'ProductSNRule' AND OnPlantID=@OnPlantAND EXISTS(SELECT 1 FROM #WorkMESOrderID b WHERE a.MESOrderID=b.Val)--------------------------------------------------------------------------------------------條件判斷(邏輯分析)開(kāi)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(duì)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_SNSELECT 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.SNLEFT JOIN #SourceLotNameTable c ON a.SourceLotName=c.SourceLotNameLEFT JOIN CO_SN_LINK_CUSTOMER d WITH(NOLOCK) ON a.LotName=d.SNMesENDELSEBEGIN--已知SN集合求解對(duì)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 NULLSELECT a.LotPK,a.SourceLotPK,b.LotName INTO #WorkSourcePK430 FROM #WorkSourcePK420 a JOIN #WorkLotPK410 b ON a.LotPK=b.LotPKINSERT 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.SNMesDELETE FROM #FinalLotNameINSERT 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_SNSELECT 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.SNLEFT JOIN #SourceLotNameTable2 c ON a.SourceLotName=c.SourceLotNameEND END--2.2IF @DateCode<>''BEGINSELECT Val INTO #WorkDateCode FROM fn_String_To_Table(@DateCode,',',1)--此@DataCode條件求解出來(lái)的是SourceSNSELECT 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(kāi)始IF EXISTS(SELECT 1 FROM #FinalCO_SN)--如果前面判斷的查詢條件有值BEGINSELECT 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_SNINSERT INTO #FinalCO_SN SELECT LotName,SourceLotName,SNCust,MaterialID,ComMaterials,MESOrderID,OnPlantID,VendorID,DateCode,SNNote FROM #TMP51ENDELSEBEGINIF EXISTS(SELECT 1 FROM #FinalLotName)BEGIN--查出SourceLotName對(duì)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(duì)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=@OnPlantAND EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.LotName)INSERT INTO #FinalCO_SNSELECT 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.SNLEFT JOIN #WorkSourceSNT1 c ON a.SourceLotName=c.SourceSNLEFT JOIN CO_SN_LINK_CUSTOMER d WITH(NOLOCK) ON a.LotName=d.SNMesENDELSEBEGIN--已知SourceSN集合求解對(duì)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.SourceLotPKINSERT 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.SNMesDELETE FROM #FinalLotNameINSERT 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=@OnPlantAND EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.LotName)INSERT INTO #FinalCO_SNSELECT 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.SNLEFT JOIN #WorkSourceSNT1 c ON a.SourceLotName=c.SourceSNENDENDEND--2.3IF @comdef<>''BEGINSELECT Val INTO #WorkComdef FROM fn_String_To_Table(@comdef,',',1)--此@comdef條件求解出來(lái)的是SourceSNSELECT 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(kāi)始IF EXISTS(SELECT 1 FROM #FinalCO_SN)--如果前面判斷的查詢條件有值BEGINSELECT 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_SNINSERT INTO #FinalCO_SN SELECT LotName,SourceLotName,SNCust,MaterialID,ComMaterials,MESOrderID,OnPlantID,VendorID,DateCode,SNNote FROM #TMP516ENDELSEBEGINIF EXISTS(SELECT 1 FROM #FinalLotName)BEGIN--查出SourceLotName對(duì)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(duì)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=@OnPlantAND EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.LotName)INSERT INTO #FinalCO_SNSELECT 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.SNLEFT JOIN #WorkSourceSNT16 c ON a.SourceLotName=c.SourceSNLEFT JOIN CO_SN_LINK_CUSTOMER d WITH(NOLOCK) ON a.LotName=d.SNMesENDELSEBEGIN--已知SourceSN集合求解對(duì)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.SourceLotPKINSERT 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.SNMesDELETE FROM #FinalLotNameINSERT 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=@OnPlantAND EXISTS(SELECT 1 FROM #FinalLotName b WHERE a.SN=b.LotName)INSERT INTO #FinalCO_SNSELECT 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.SNLEFT JOIN #WorkSourceSNT16 c ON a.SourceLotName=c.SourceSNENDENDEND/*** 3)條件判斷結(jié)束**/IF EXISTS(SELECT 1 FROM #FinalLotName)BEGINIF EXISTS(SELECT 1 FROM #FinalCO_SN)BEGIN--3.1SELECT 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 aJOIN MMDefinitions b WITH(NOLOCK) ON a.matl_def_id=b.DefIDJOIN MMDefinitions c WITH(NOLOCK) ON a.ComMaterials=c.DefIDWHERE NOT EXISTS(select distinct SN, SourceSN from #FinalCO_SN x where x.SN = a.SourceSN and x.SourceSN = a.SN)ENDELSEBEGIN--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=@OnPlantAND 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.SNCustFROM #FinalLotName aLEFT JOIN #FinalSNX1 b ON a.LotName=b.SNLEFT JOIN #FinalSNX2 c ON a.SourceLotName=c.SourceLotNameJOIN MMDefinitions x WITH(NOLOCK) ON b.MaterialID=x.DefIDJOIN MMDefinitions y WITH(NOLOCK) ON c.ComMaterials=y.DefIDWHERE NOT EXISTS(SELECT DISTINCT * FROM #FinalLotName zWHERE z.LotName=a.SourceLotName and z.SourceLotName=a.LotName)ENDENDELSEBEGINIF EXISTS(SELECT 1 FROM #FinalCO_SN)BEGIN--3.3SELECT 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 aJOIN MMDefinitions b WITH(NOLOCK) ON a.matl_def_id=b.DefIDJOIN MMDefinitions c WITH(NOLOCK) ON a.ComMaterials=c.DefIDWHERE NOT EXISTS(select distinct SN, SourceSN from #FinalCO_SN x where x.SN = a.SourceSN and x.SourceSN = a.SN)ENDELSEBEGIN--3.4PRINT 'There is no queryable condition,please enter at less a query conditon.'ENDEND END GO

雖然犧牲了代碼的可讀性，但創(chuàng)造了性能價(jià)值。本人水平有限，還請(qǐng)各位不吝賜教！

最后，將SSRS報(bào)表替換成此存儲(chǔ)過(guò)程后，SQL查詢分析器是秒查的。B/S前端用時(shí)1~2秒！

四. 總結(jié)

平常的你是否偶爾會(huì)因急于完成任務(wù)而書(shū)寫一堆性能極低的SQL語(yǔ)句呢？寫出可靠性能的SQL語(yǔ)句不難，難的是習(xí)慣。

本文的優(yōu)化思想很簡(jiǎn)單，關(guān)鍵點(diǎn)是避免全表掃描 & 注重SQL語(yǔ)句寫法 & 索引，另外，如果你查詢的表有可能會(huì)在查詢時(shí)段更新，而實(shí)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。

最后

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總結(jié)

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