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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(gè)報(bào)表。優(yōu)化完成后，報(bào)表查詢速度有從半小時(shí)以上(甚至查不出)到秒查的質(zhì)變。從修改SQL查詢語(yǔ)句邏輯到?jīng)Q定創(chuàng)建存儲(chǔ)過(guò)程實(shí)現(xiàn)，花了我3天多的時(shí)間，在此總結(jié)一下，希望對(duì)朋友們有幫助。

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。ps:我剛?cè)肼毑痪谩?

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(xiě)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。搜索Java知音公眾號(hào)，回復(fù)“后端面試”，送你一份Java面試題寶典

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(xiě)，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(xiě)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(xiě)一堆性能極低的SQL語(yǔ)句呢？寫(xiě)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(xiě)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。

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