Performance in SSRS

Question

Hi i has a Report which pulls 900 records from a 5 million Data set.
Actually i have tuned my Stored Procedure.While running the Sp against SQL SERVER Database it was taking only few sec(4) but when i run that Report which uses that SP it was taking almost 45 sec to show up the data on report manager.
In this case how can i tune in Report Manger.Why the both times are different?

Answer 1

Hi -
Is your stored procedure using parameters from the report?
If so, then I had a similar experience.  I'd run the stored proc and it would run in a few seconds when running via SSMS...but then the report would take forever (or very close!) to run.
As it turned out the problem had to do with a poor/incorrect execution plan being used because of parameter sniffing.  Try google (or bing)  sql server stored procedure and parameter sniffing.  
Basically, what I had to do (and you might too) is to spoof the parameters in the stored proc.
So, instead of this:
Create Procedure MyProc
@Param1 datetime
, @Param2 nvarchar(50)
AS
Declare @MyParam1 datetime = @Param1
Declare @MyParam2 nvarchar(50) = @Param2
SELECT Column1, Column2
FROM dbo.Table1 t
Where t.Column1 = @MyParam1
And t.Column2 = @MyParam2
I had to do this...and the results were great...back to excellent performance for the query:
Create Procedure MyProc
  @Param1 datetime
, @Param2 nvarchar(50)
AS
Declare @MyParam1 datetime = @Param1
Declare @MyParam2 nvarchar(50) = @Param2
SELECT Column1, Column2
FROM  dbo.Table1 t
Where  t.Column1 = @MyParam1
And    t.Column2 = @MyParam2
Hope this helps.
 - will
- will