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Posted by rbg on 01/26/07 13:56
You are right, I did not include the exact query since it has a whole
of joins and many where clauses in it.
I did not want to make the post very hard to read, hence I simplified
it.
In the Stored proc I am using a String variable @SQLString
varchar(2000) to hold the entire select statement, and then executing
that SQL using EXEC (@SQLString).
Thus for debugging, I used Query Analyzer, and within the Analyzer I am
using the Select statement.
So in my test I do not use any stored proc.
so one select statement says:
Select * from ( Select Top 600 * from
( Select Top 2000 * from
( Select Top 2000 PermitNumber, HouseNumber, OnStreetName,
FromStreetName, ToStreetName, WorkStartDate as "WorkStart",
tbl_Permittee.Permittee_name as PermitteeName, PermitteeNumber,
PermitType_ID as "Type",
InspectionDistrict,
PermitStatus,
IssueDate
>From PermitMain inner join tbl_Permittee
on PermitMain.PermitteeNumber = tbl_Permittee.Permittee_Number
and (tbl_Permittee.Permittee_name_flag = 'd' or
tbl_Permittee.Permittee_name_flag = 'p')
where
(PermitType_ID like '01%' ) and worktypeid is null
and ((IssueDate between @IssueDateFrom and @IssueDateTo) or
(EmergIssueDate between @IssueDateFrom and @IssueDateTo))
and PermitteeNumber = @PermitteeNumber
and PermitMain.Boroughcode = @Boro
order by WorkStart DESC
) as T2 order by WorkStart ASC
) as T3
) as T4 order by WorkStart DESC
THIS ONE RUNS FAST and RETURNS RESULTS.
The Other Select statement:
Select * from ( Select Top 600 * from
( Select Top 2000 * from
( Select Top 2000 PermitNumber, HouseNumber, OnStreetName,
FromStreetName, ToStreetName, WorkStartDate as "WorkStart",
tbl_Permittee.Permittee_name as PermitteeName, PermitteeNumber,
PermitType_ID as "Type",
InspectionDistrict,
PermitStatus,
IssueDate
>From PermitMain inner join tbl_Permittee
on PermitMain.PermitteeNumber = tbl_Permittee.Permittee_Number
and (tbl_Permittee.Permittee_name_flag = 'd' or
tbl_Permittee.Permittee_name_flag = 'p')
where
(PermitType_ID like @WorkTYPE ) and worktypeid is null
and ((IssueDate between @IssueDateFrom and @IssueDateTo) or
(EmergIssueDate between @IssueDateFrom and @IssueDateTo))
and PermitteeNumber = @PermitteeNumber
and PermitMain.Boroughcode = @Boro
order by WorkStart DESC
) as T2 order by WorkStart ASC
) as T3
) as T4 order by WorkStart DESC
TAKES FOREVER to COMPLETE.
However IF I INCREASE the PAGESIZE from 600 to 800, BOTH QUERIES RETURN
RESULTS EQUALLY FAST.
Thanks for your help
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