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Subject:
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Same Store Proc run 100x slower in identical sql-s
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Posted By:
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jphan5024
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Post Date:
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5/13/2008 4:15:18 PM
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Please let me know what type of Traces I can run to identify the underlying cause. Both setup are in Dev. Same everything but 100x slower. Each Dev sql-server has it's own separate identical virtual machine. Statistics are almost identical, rowcount, index defrag %. No contention on the server to worry about locks & latches. This is a real brain teaser for me. We're on Sql 2000 sp3a though planning to upgrade to 2005.
declare
@AN_CustID int,
@LastName varchar(30),
@FirstName varchar(30)
select @AN_CustID = 2824, @LastName = 'XXXXX', @FirstName = 'XXXXX'
SET NOCOUNT ON
DECLARE @SdxLastName char(4)
DECLARE @TheFirstName varchar(30)
DECLARE @HitCountLastNameOnly int
DECLARE @HitCountFirstName int
DECLARE @ThresholdLastName int
DECLARE @ThresholdFirstName int
-- Set minimum row hit count for when to use the first name in addition to last name for search
SET @ThresholdLastName = 2 --if we get at least this number of rows back, ignore the first name completely
-- Set maximum row hit count for when to use the exact first name instead of first name soundex in addition to last name soundex for search
SET @ThresholdFirstName = 12 --if we get over this number of rows back, look for exact first name match
SELECT
@AN_CustID = ISNULL(@AN_CustID, 0),
@LastName = RTRIM(ISNULL(@LastName, '')),
@FirstName = RTRIM(ISNULL(@FirstName, ''))
IF @AN_CustID < 1 OR @LastName = '' RETURN --required params
-- Whenever a doctor's first name is unknown, the user will enter "DR"; therefore, do not soundex the first name in this case
IF @FirstName='DR.' OR @FirstName='DR' SET @FirstName=''
-- Get the soundex of the specified physician
SELECT @SdxLastName = dbo.aif_Soundex(@LastName), @TheFirstName = dbo.aif_Soundex(@FirstName)
-- Determine how many rows are returned based solely on similarity of the last name
SELECT
@HitCountLastNameOnly = COUNT(*) FROM PhysicianMstr p (NOLOCK)
WHERE
p.AN_CustID = @AN_CustID
AND p.Active = 1
AND @SdxLastName = dbo.aif_Soundex(RTRIM(p.LastName))
-- Check if using just the last name soundex returns too few rows
IF @HitCountLastNameOnly < @ThresholdLastName
BEGIN
-- Determine how many rows are returned based on last name soundex or first name soundex
SELECT
@HitCountFirstName = COUNT(*)
FROM PhysicianMstr p (NOLOCK)
WHERE
p.AN_CustID = @AN_CustID
AND p.Active = 1
AND (
@SdxLastName = dbo.aif_Soundex(RTRIM(p.LastName))
OR @TheFirstName = dbo.aif_Soundex(RTRIM(p.FirstName))
)
-- If too many rows, switch to exact match on first name instead of soundex of first name
IF @HitCountFirstName > @ThresholdFirstName
BEGIN
SET @TheFirstName = @FirstName
SET @HitCountLastNameOnly = -1 --negative value indicates first name exact match, not soundex
END
END
-- List physicians with similar sounding names
SELECT
p.AN_PhysicianID,
pm.AN_CustID,
RTRIM(p.LastName) AS LastName,
RTRIM(p.FirstName) AS FirstName,
RTRIM(p.StateLicNo) AS UPIN,
RTRIM(mis.Specialty) AS Specialty1,
pm.Specialty2,
p.Active,
RTRIM(pm.Degree) AS Degree,
pm.Extra,
p.CreatedBy,
p.CreatedOn,
p.ModifiedBy,
p.ModifiedOn,
p.PLEPhysicianMIID
FROM
PLEPhysicianMstrMI p (NOLOCK)
INNER JOIN PhysicianMstr pm (NOLOCK) ON
p.AN_PhysicianID = pm.AN_PhysicianID
LEFT JOIN PLEPhysicianSpecialtyMstrMI mis (NOLOCK) ON
p.PLEPhysicianSpecialtyMIID = mis.PLEPhysicianSpecialtyMIID
WHERE
pm.AN_CustID = @AN_CustID
AND p.Active = 1
AND (
@SdxLastName = dbo.aif_Soundex(RTRIM(p.LastName))
OR @TheFirstName =
CASE
-- Include first name only when we don't have the minimum number of rows
WHEN @HitCountLastNameOnly < 0 THEN p.FirstName --exact first name match
WHEN @HitCountLastNameOnly < @ThresholdLastName THEN dbo.aif_Soundex(RTRIM(p.FirstName))
ELSE '****' --force false for first name test
END
)
ORDER BY p.LastName, p.FirstName
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