Sqlserver time out when use multiple leftjoin in searcing

Question

Can anyone explain what reason cause follow #2,#3,#4,#5, i'm confusing for this problem in whole afternoon . thank you very much.
you can copy the follow small example to see the timeout issue , if your pc is too quick, haven't yet see timeout issue in 24 tempBookAddress. just add more left join for TempBookAddress, then the the issue will show up.
1.Create three temptables
create Table #TempBookAddress
   BookID int,
   AddressTypeID nvarchar(1)
Create Table #TempBook1
(BookID int)
insert into #TempBook1(BookID) values(1930)
insert into #TempBook1(BookID) values(1931)
insert into #TempBook1(BookID) values(1932)
insert into #TempBook1(BookID) values(1933)
Create Table #TempBook
(BookID int)
insert into #TempBook(BookID) values(1930)
2. do not insert any data into #TempBookAddress , and execute follow sql query . the exuecute time is too long, until cause timeout
select * from #TempBook1 B
inner join #TempBook b1 on B.BookID = b1.BookID
left join #TempBookAddress ba1 on B.BookID =ba1.BookID and ba1.AddressTypeID ='A'
left join #TempBookAddress ba2 on B.BookID =ba2.BookID and ba2.AddressTypeID ='B'
left join #TempBookAddress ba3 on B.BookID =ba3.BookID and ba3.AddressTypeID ='C'
left join #TempBookAddress ba4 on B.BookID =ba4.BookID and ba4.AddressTypeID ='D'
left join #TempBookAddress ba5 on B.BookID =ba5.BookID and ba5.AddressTypeID ='E'
left join #TempBookAddress ba6 on B.BookID =ba6.BookID and ba6.AddressTypeID ='F'
left join #TempBookAddress ba7 on B.BookID =ba7.BookID and ba7.AddressTypeID ='G'
left join #TempBookAddress ba8 on B.BookID =ba8.BookID and ba8.AddressTypeID ='H'
left join #TempBookAddress ba9 on B.BookID =ba9.BookID and ba9.AddressTypeID ='I'
left join #TempBookAddress ba10 on B.BookID =ba10.BookID and ba10.AddressTypeID ='J'
left join #TempBookAddress ba11 on B.BookID =ba11.BookID and ba11.AddressTypeID ='K'
left join #TempBookAddress ba12 on B.BookID =ba12.BookID and ba12.AddressTypeID ='L'
left join #TempBookAddress ba13 on B.BookID =ba13.BookID and ba13.AddressTypeID ='M'
left join #TempBookAddress ba14 on B.BookID =ba14.BookID and ba14.AddressTypeID ='N'
left join #TempBookAddress ba15 on B.BookID =ba15.BookID and ba15.AddressTypeID ='O'
left join #TempBookAddress ba16 on B.BookID =ba16.BookID and ba16.AddressTypeID ='P'
left join #TempBookAddress ba17 on B.BookID =ba17.BookID and ba17.AddressTypeID ='Q'
left join #TempBookAddress ba18 on B.BookID =ba18.BookID and ba18.AddressTypeID ='R'
left join #TempBookAddress ba19 on B.BookID =ba19.BookID and ba19.AddressTypeID ='S'
left join #TempBookAddress ba20 on B.BookID =ba20.BookID and ba20.AddressTypeID ='T'
left join #TempBookAddress ba21 on B.BookID =ba21.BookID and ba21.AddressTypeID ='U'
left join #TempBookAddress ba22 on B.BookID =ba22.BookID and ba22.AddressTypeID ='V'
left join #TempBookAddress ba23 on B.BookID =ba23.BookID and ba23.AddressTypeID ='W'
left join #TempBookAddress ba24 on B.BookID =ba24.BookID and ba24.AddressTypeID ='X'
3. if insert any data into  #TempBookAddress ,
like :insert into #TempBookAddress (BookID,AddressTypeID) values(-1,'A') before execute above query sql.Execute sql very quick . can return return result in one sec.
4. if remove some left join, just keep left join from ba1 to ba18 , the performance still ok.After ba18 , the more one we added ,the execute time have big difference
5. if do not use innerJoin for #TempBook1 , use where clause replace inner join , the sql still very quick.
this is the sql
select * from #TempBook1 B
left join #TempBookAddress ba1 on B.BookID =ba1.BookID and ba1.AddressTypeID ='A'
left join #TempBookAddress ba2 on B.BookID =ba2.BookID and ba2.AddressTypeID ='B'
left join #TempBookAddress ba3 on B.BookID =ba3.BookID and ba3.AddressTypeID ='C'
left join #TempBookAddress ba4 on B.BookID =ba4.BookID and ba4.AddressTypeID ='D'
left join #TempBookAddress ba5 on B.BookID =ba5.BookID and ba5.AddressTypeID ='E'
left join #TempBookAddress ba6 on B.BookID =ba6.BookID and ba6.AddressTypeID ='F'
left join #TempBookAddress ba7 on B.BookID =ba7.BookID and ba7.AddressTypeID ='G'
left join #TempBookAddress ba8 on B.BookID =ba8.BookID and ba8.AddressTypeID ='H'
left join #TempBookAddress ba9 on B.BookID =ba9.BookID and ba9.AddressTypeID ='I'
left join #TempBookAddress ba10 on B.BookID =ba10.BookID and ba10.AddressTypeID ='J'
left join #TempBookAddress ba11 on B.BookID =ba11.BookID and ba11.AddressTypeID ='K'
left join #TempBookAddress ba12 on B.BookID =ba12.BookID and ba12.AddressTypeID ='L'
left join #TempBookAddress ba13 on B.BookID =ba13.BookID and ba13.AddressTypeID ='M'
left join #TempBookAddress ba14 on B.BookID =ba14.BookID and ba14.AddressTypeID ='N'
left join #TempBookAddress ba15 on B.BookID =ba15.BookID and ba15.AddressTypeID ='O'
left join #TempBookAddress ba16 on B.BookID =ba16.BookID and ba16.AddressTypeID ='P'
left join #TempBookAddress ba17 on B.BookID =ba17.BookID and ba17.AddressTypeID ='Q'
left join #TempBookAddress ba18 on B.BookID =ba18.BookID and ba18.AddressTypeID ='R'
left join #TempBookAddress ba19 on B.BookID =ba19.BookID and ba19.AddressTypeID ='S'
left join #TempBookAddress ba20 on B.BookID =ba20.BookID and ba20.AddressTypeID ='T'
left join #TempBookAddress ba21 on B.BookID =ba21.BookID and ba21.AddressTypeID ='U'
left join #TempBookAddress ba22 on B.BookID =ba22.BookID and ba22.AddressTypeID ='V'
left join #TempBookAddress ba23 on B.BookID =ba23.BookID and ba23.AddressTypeID ='W'
left join #TempBookAddress ba24 on B.BookID =ba24.BookID and ba24.AddressTypeID ='X'
where B.BookID = 1930

Answer 1

Why do you need all these left joins?
As I understand what you need is just this instead
try this way and see if its any better
select B.*,
ba1.*
from #TempBook1 B
left join
SELECT BookID,
MAX(CASE WHEN AddressTypeID ='B' THEN yourrequiredfield1 END) AS yourrequiredfield1B,
MAX(CASE WHEN AddressTypeID ='B' THEN yourrequiredfield2 END) AS yourrequiredfield2B,
MAX(CASE WHEN AddressTypeID ='B' THEN yourrequiredfield3 END) AS yourrequiredfield3B,
MAX(CASE WHEN AddressTypeID ='C' THEN yourrequiredfieldn END) AS yourrequiredfieldnC,
MAX(CASE WHEN AddressTypeID ='C' THEN yourrequiredfield1 END) AS yourrequiredfield1C,
MAX(CASE WHEN AddressTypeID ='C' THEN yourrequiredfield2 END) AS yourrequiredfield2C,
MAX(CASE WHEN AddressTypeID ='C' THEN yourrequiredfield3 END) AS yourrequiredfield3C,
MAX(CASE WHEN AddressTypeID ='C' THEN yourrequiredfieldn END) AS yourrequiredfieldnC,
MAX(CASE WHEN AddressTypeID ='D' THEN yourrequiredfield1 END) AS yourrequiredfield1D,
MAX(CASE WHEN AddressTypeID ='D' THEN yourrequiredfield2 END) AS yourrequiredfield2D,
MAX(CASE WHEN AddressTypeID ='D' THEN yourrequiredfield3 END) AS yourrequiredfield3D,
MAX(CASE WHEN AddressTypeID ='D' THEN yourrequiredfieldn END) AS yourrequiredfieldnD,
MAX(CASE WHEN AddressTypeID ='X' THEN yourrequiredfield1 END) AS yourrequiredfield1X,
MAX(CASE WHEN AddressTypeID ='X' THEN yourrequiredfield2 END) AS yourrequiredfield2X,
MAX(CASE WHEN AddressTypeID ='X' THEN yourrequiredfield3 END) AS yourrequiredfield3X,
MAX(CASE WHEN AddressTypeID ='X' THEN yourrequiredfieldn END) AS yourrequiredfieldnX
#TempBookAddress
GROUP BY BookID)ba1
on B.BookID =ba1.BookID
where B.BookID = 1930
you need to repeat max expression for each required field in output once for each addresstype value
also see the way to do it dynamically here
http://beyondrelational.com/modules/2/blogs/70/posts/10791/dynamic-crosstab-with-multiple-pivot-columns.aspx
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