How to optimise this stored procedure? - sql-server

Question

I have the stored procedure below and I am having two issues with it
It is running very slowly, and
It is returning a blank result set
The idea for the stored procedure is to do a sequence check to find if any account numbers have not been assigned.
Step 1 loops through all the branches and builds up the tempdetails table.
After that it creates the list of all the numbers that have been used and uses that to delete everything that exists to leave a list of those accountnumbers that do not exist,
But een though I know there are missing account numbers, aside from the exceptionally long tun time it is returning a blank result set.
Anyone have any ideas what is going wrong with it?
Thanks
ALTER PROCEDURE [dbo].[PracticeFindMissingSequenceDetail]
#pracId VARCHAR(128),
#Prefix VARCHAR(256)
AS
BEGIN
DECLARE #TempDetails TABLE (SequenceCheck VARCHAR(24),
Prefix VARCHAR(4),
BranchName VARCHAR(256),
RisStatus VARCHAR(256),
Rislink VARCHAR(256)
);
DECLARE #Branchlist TABLE (BranchId INTEGER,
BranchName VARCHAR(256),
BranchPrefix VARCHAR(4),
PrefixLength INT,
SequenceLength INT
);
DECLARE #TempPatNo TABLE (Patno VARCHAR(24));
DECLARE #BranchName VARCHAR(256),
#BranchPrefix VARCHAR(256),
#PrefixLength INT,
#BranchId INT,
#SequenceLength INT,
#rangestart INTEGER,
#rangeend INTEGER,
#rangenow INTEGER,
#startDate DATETIME,
#Patno VARCHAR(128),
#FormatZeroes VARCHAR(3),
#CurrentLength INT,
#RangeString VARCHAR(256);
INSERT INTO #Branchlist (BranchId, BranchName, BranchPrefix, PrefixLength, SequenceLength)
SELECT
b.id, b.name, b.prefix, PrefixLength, SequenceLength
FROM
Branch b
INNER JOIN
Practice pr ON pr.id = b.practiceid
INNER JOIN
[Sequence] s ON s.id = b.id
WHERE
pr.APIKey = #pracID
AND b.inactive = 0
AND b.prefix = #Prefix
/* insert values for each branch into table*/
DECLARE BranchPointer CURSOR FOR
SELECT BranchID FROM #Branchlist
OPEN BranchPointer
FETCH NEXT FROM BranchPointer INTO #BranchId
WHILE ##FETCH_STATUS = 0
BEGIN
SELECT #BranchPrefix = (SELECT BranchPrefix
FROM #Branchlist
WHERE BranchId = #BranchId)
SELECT #PrefixLength = (SELECT PrefixLength
FROM #Branchlist
WHERE BranchId = #BranchId)
SELECT #SequenceLength = (SELEct SequenceLength
FROM #Branchlist
WHERE BranchId = #BranchId)
/* Set the starting date from the sequence */
SELECT #startDate = (SELECT MIN(MinimumSequenceDate)
FROM [Sequence] s
WHERE s.id = #BranchId)
/*get the earliest number in the sequence from the startdate*/
SELECT #rangestart = (SELECT MIN(SUBSTRING(v.bookingnumber, 3, LEN(bookingnumber)))
FROM Visit v
INNER join Branch b ON b.id = v.branchid
INNER join Practice pr ON pr.id = b.practiceid
WHERE pr.APIKey = #pracId
AND LEFT(v.bookingnumber, 2) = #Prefix
AND v.date >= #startDate
AND v.branchid = #BranchId);
/*get the latest number in the sequence from the startdate*/
SELECT #rangeend = (SELECT MAX(SUBSTRING(v.bookingnumber, 3, LEN(bookingnumber)))
FROM Visit v
INNER JOIN Branch b ON b.id = v.branchid
INNER JOIN Practice pr ON pr.id = b.practiceid
WHERE pr.APIKey = #pracId
AND LEFT(v.bookingnumber, 2) = #Prefix
AND v.date >= #startDate
AND v.branchid = #BranchId);
SET #RangeNow = #rangestart
WHILE #rangenow < #rangeend
BEGIN
/*check if leading zeroes are needed in the number and add them if needed*/
SET #RangeString = CAST(#RangeNow AS VARCHAR(256))
SET #CurrentLength = LEN(#rangenow)
IF #prefixlength + #currentlength < #SequenceLength
WHILE #CurrentLength + #PrefixLength < #SequenceLength
BEGIN
SET #RangeString = '0' + #RangeString;
SET #currentlength = LEN(#RangeString);
END;
/*Insert full sequence into temporary table*/
INSERT INTO #TempDetails (SequenceCheck, Prefix, BranchName)
SELECT #Prefix + #RangeString, #Prefix, #BranchName
SET #rangenow =#rangenow+1
END;
FETCH NEXT FROM BranchPointer INTO #BranchName
END
CLOSE BranchPointer
DEALLOCATE BranchPointer
/*delete existing sequence numbers from table*/
INSERT INTO #TempPatNo (PatNo)
SELECT BookingNumber
FROM Visit v1
INNER JOIN Branch b1 ON b1.id = v1.branchid
INNER JOIN Practice pr1 ON pr1.id = b1.practiceid
WHERE pr1.APIKey = #pracId
DELETE #TempDetails
WHERE sequencecheck IN (SELECT patNo FROM #TempPatNo)
/*Insert the status and link for error messages*/
UPDATE #tempDetails
SET RisStatus = (SELECT Status
FROM RISErrors r
INNER JOIN Practice pr ON pr.id = r.PracticeId
WHERE pr.APIKey = #pracId
AND VisitNumber = SequenceCheck
AND r.id = (SELECT MAX(r1.id)
FROM RISErrors r1
INNER JOIN Practice pr1 ON pr1.id = r1.PracticeId
WHERE pr1.APIKey = #pracId
AND VisitNumber = SequenceCheck)),
RisLink = 'http://billing.cryanic.co.za/Clinton/RISErrors?searchquery=' + SequenceCheck
/*return missing numbers into sequence control callong procedure*/
SELECT DISTINCT SequenceCheck, RisStatus, Rislink
FROM #TempDetails
END

Answer 1

After reading your procedure, I made some assumptions:
there is a one-to-one relationsship between sequence and branch
the visits are the details of a sequence
the BranchName and BranchPrefix aren't needed.
I recommend to not do lookups by BranchID but instead retrieve the values from the cursor query. The table BranchList isn't needed, you can base the cursor on the query directly. Also, the TempPatNo table can be avoided.
Here's what I have come up with:
ALTER PROCEDURE [dbo].[PracticeFindMissingSequenceDetail]
#pracId VARCHAR(128),
#Prefix VARCHAR(256)
AS
BEGIN
DECLARE #TempDetails TABLE (
BranchID INT,
SequenceCheck VARCHAR(24),
RisStatus VARCHAR(256),
Rislink VARCHAR(256)
);
DECLARE
#PrefixLength INT,
#BranchId INT,
#SequenceLength INT,
#rangestart INTEGER,
#rangeend INTEGER,
#rangenow INTEGER,
#startDate DATETIME;
/* insert values for each branch into table*/
DECLARE BranchPointer CURSOR FOR
SELECT b.id, PrefixLength, SequenceLength, s.MinimumSequenceDate
FROM Branch b
INNER JOIN Practice pr ON pr.id = b.practiceid
INNER JOIN [Sequence] s ON s.id = b.id
WHERE pr.APIKey = #pracID
AND b.prefix = #Prefix
AND b.inactive = 0
OPEN BranchPointer
FETCH NEXT FROM BranchPointer INTO #BranchId, #PrefixLength, #SequenceLength, #startDate
WHILE ##FETCH_STATUS = 0
BEGIN
/*get the earliest and latest number in the sequence from the startdate*/
SELECT
#rangestart = MIN(SUBSTRING(v.bookingnumber, 3, LEN(v.bookingnumber))),
#rangeend = MAX(SUBSTRING(v.bookingnumber, 3, LEN(v.bookingnumber)))
FROM Visit v
WHERE v.branchid = #BranchId
AND v.date >= #startDate
AND LEFT(v.bookingnumber, 2) = #Prefix;
SET #RangeNow = #rangestart
WHILE #rangenow < #rangeend
BEGIN
/*Insert full sequence into temporary table*/
INSERT INTO #TempDetails (BranchID, SequenceCheck)
SELECT #BranchId,
#Prefix + REPLICATE('0', #SequenceLength-#PrefixLength-LEN(#rangenow)) + CAST(#RangeNow AS VARCHAR(256));
SET #rangenow =#rangenow+1
END;
FETCH NEXT FROM BranchPointer INTO #BranchId, #PrefixLength, #SequenceLength, #startDate
END
CLOSE BranchPointer
DEALLOCATE BranchPointer
/*delete existing sequence numbers from table*/
DELETE FROM #TempDetails
FROM #TempDetails t
INNER JOIN Visit v ON t.BranchID = v.branchid
WHERE t.SequenceCheck = v.BookingNumber
/*Insert the status and link for error messages*/
UPDATE #tempDetails
SET RisStatus = (SELECT Status
FROM RISErrors r
INNER JOIN Practice pr ON pr.id = r.PracticeId
WHERE pr.APIKey = #pracId
AND VisitNumber = SequenceCheck
AND r.id = (SELECT MAX(r1.id)
FROM RISErrors r1
INNER JOIN Practice pr1 ON pr1.id = r1.PracticeId
WHERE pr1.APIKey = #pracId
AND VisitNumber = SequenceCheck)),
RisLink = 'http://billing.cryanic.co.za/Clinton/RISErrors?searchquery=' + SequenceCheck
/*return missing numbers into sequence control callong procedure*/
SELECT DISTINCT SequenceCheck, RisStatus, Rislink
FROM #TempDetails
END