SSRS Dataset Query Takes 2 Hours To Run

hello

I have been assigned the task to port some reports from Business Objects 5.0 to Reporting Services 2005.
The BO reports used data regions based on multiple datasets, which is not feasible in SSRS.
So I have to get everything in one big query. The problem is that the query runs for 2 hours instead of a couple of minutes with our old BO solution which got it's data from an access database !
is there a better way to do this ?

here is the query





Code Snippet

ALTER PROCEDURE [dbo].[MERCKGEN_HDMCKQ02_DoctorBrickDoctorGroups_values]
-- Add the parameters for the stored procedure here
@TimePeriodDesc varchar(255),
@TotalMarket varchar(255),
@datasetname varchar(255),
@VisibleProducts varchar(500),
@DoctorSubTerritory varchar(255)
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

-- Insert statements for procedure here
SELECT xpospecialty.specialtydesc,
a.doctorsubterritory ,
a.doctorbrick ,
a.doctorgroup ,
xpomarket.productdesc ,
s.totalmarketrank ,
s.prod1ranktotal ,
s.prod2ranktotal ,
SUM
(
CASE
WHEN (xpotimeperiod.timeperioddesc = @TimePeriodDesc)
THEN xpomeasures.rxvalues
ELSE 0
END
) AS totalrxvalues,
COUNT
(
CASE
WHEN (xpoproductsize.prodsizedesc <> 'Non -')
AND (XpoMarketSize.MarketSizeDesc <> 'Non - MKT')
AND (xpotimeperiod.timeperioddesc = @TimePeriodDesc)
THEN 1
ELSE NULL
END
) AS rxrcount,
COUNT
(
CASE
WHEN (xpoproductsize.prodsizedesc = 'High')
AND (xpotimeperiod.timeperioddesc = @TimePeriodDesc)
THEN 1
ELSE NULL
END
) AS [high],
COUNT
(
CASE
WHEN (xpoproductsize.prodsizedesc = 'Medium')
AND (xpotimeperiod.timeperioddesc = @TimePeriodDesc)
THEN 1
ELSE NULL
END
) AS [medium],
COUNT
(
CASE
WHEN (xpoproductsize.prodsizedesc = 'Low')
AND (xpotimeperiod.timeperioddesc = @TimePeriodDesc)
THEN 1
ELSE NULL
END
) AS [low],
COUNT
(
CASE
WHEN (xpoproductsize.prodsizedesc = 'Very Low')
AND (xpotimeperiod.timeperioddesc = @TimePeriodDesc)
THEN 1
ELSE NULL
END
) AS [very low],
COUNT
(
CASE
WHEN (xpoproductsize.prodsizedesc = 'Very High')
AND (xpotimeperiod.timeperioddesc = @TimePeriodDesc)
THEN 1
ELSE NULL
END
) AS [very high],
(SELECT SUM(xpomeasures.rxvalues) AS totalrxvalues
FROM dbo.xpotimeperiod
INNER JOIN dbo.xpomeasures
ON xpotimeperiod.timeperiodid = xpomeasures.timeperiodid
INNER JOIN dbo.xpomarket
ON xpomeasures.xpomarketid = xpomarket.xpomarketid
INNER JOIN dbo.xpogeography
ON xpomeasures.geographyid = xpogeography.geographyid
WHERE (xpomarket.productdesc = @TotalMarket)
AND (xpomeasures.datasetname = @DatasetName)
AND (xpotimeperiod.datasetname = @DatasetName)
AND (xpomarket.datasetname = @DatasetName)
AND (xpogeography.datasetname = @DatasetName)
AND (xpogeography.doctorgroup = a.doctorgroup)
AND (xpotimeperiod.timeperioddesc = @TimePeriodDesc)
) AS rxvaluesdoctorgroup
FROM dbo.xpotimeperiod
INNER JOIN dbo.xpomeasures
ON xpotimeperiod.timeperiodid = xpomeasures.timeperiodid
INNER JOIN dbo.XpoMarketSize
ON XpoMeasures.XpoMarketSizeId = XpoMarketSize.XpoMarketSizeId
INNER JOIN dbo.xpoproductsize
ON xpomeasures.xpoproductsizeid = xpoproductsize.xpoprodsizeid
INNER JOIN dbo.xpomarket
ON xpomeasures.xpomarketid = xpomarket.xpomarketid
INNER JOIN dbo.xpogeography a
ON xpomeasures.geographyid = a.geographyid
INNER JOIN dbo.xpospecialty
ON xpomeasures.xpospecialtyid = xpospecialty.xpospecialtyid
INNER JOIN dbo.Fn_mvparamsorted (@VisibleProducts,',' )
ON xpomarket.productdesc = fn_mvparamsorted.parame
LEFT JOIN (
SELECT xpogeography.doctorgroup,
SUM(CASE WHEN xpomarket.productdesc = @TotalMarket THEN xpomeasures.rxvalues ELSE 0 END) AS totalrxvalues,
ROW_NUMBER() OVER (ORDER BY ROUND(SUM(CASE WHEN xpomarket.productdesc = @TotalMarket THEN xpomeasures.rxvalues ELSE 0 END), 0) DESC) AS TotalMarketRank,
ROW_NUMBER() OVER (ORDER BY ROUND(SUM(CASE WHEN xpomarket.productdesc = 'PPI Total' AND xpogeography.doctorsubterritory = @DoctorSubTerritory THEN xpomeasures.rxvalues ELSE 0 END), 0) DESC) AS 'Prod2RankTotal',
ROW_NUMBER() OVER (ORDER BY ROUND(SUM(CASE WHEN xpomarket.productdesc = 'Merck-Generics Total' AND xpogeography.doctorsubterritory = @DoctorSubTerritory THEN xpomeasures.rxvalues ELSE 0 END), 0) DESC) AS 'Prod1RankTotal'
FROM dbo.xpotimeperiod
INNER JOIN dbo.xpomeasures ON xpotimeperiod.timeperiodid = xpomeasures.timeperiodid
INNER JOIN dbo.xpomarket ON xpomeasures.xpomarketid = xpomarket.xpomarketid
INNER JOIN dbo.xpogeography ON xpomeasures.geographyid = xpogeography.geographyid
WHERE xpomeasures.datasetname = @DatasetName
and (xpomarket.datasetname = @DatasetName)
and (xpogeography.datasetname = @DatasetName)

AND xpotimeperiod.timeperioddesc = @TimePeriodDesc
GROUP BY xpogeography.doctorgroup
) AS s ON s.doctorgroup = a.doctorgroup
WHERE (xpomeasures.datasetname = @DatasetName)
AND (xpomarketsize.datasetname = @DatasetName)
AND (xpoproductsize.datasetname = @DatasetName)
AND (xpotimeperiod.datasetname = @DatasetName)
AND (a.datasetname = @DatasetName)
AND (XpoMarket.datasetname = @DatasetName)
AND (xpotimeperiod.timeperioddesc = @TimePeriodDesc)
AND (a.doctorsubterritory = @DoctorSubTerritory)
GROUP BY xpospecialty.specialtydesc,
a.doctorsubterritory ,
a.doctorbrick ,
a.doctorgroup ,
fn_mvparamsorted.parame ,
fn_mvparamsorted.sortid ,
xpomarket.productdesc ,
s.totalmarketrank ,
s.prod1ranktotal ,
s.prod2ranktotal
ORDER BY s.totalmarketrank,
a.doctorgroup ,
fn_mvparamsorted.sortid
END