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hi friends i have created two cursors for fetching records from one table and updating column of second table but the problem i am facing is the cursors are very slow and i want to speed up the query see i have written the query like this :
[code language="SQL"]
--update cdr set destinationid = null
DECLARE @CDRID BIGINT;
DECLARE @CodeDestID BIGINT;
DECLARE @TempCodeDestID BIGINT;
DECLARE @CtryCode VARCHAR(20);
DECLARE @MATCH INT;
DECLARE @dialed_digits NVARCHAR(50);
DECLARE @FormattedNbr VARCHAR(50);
DECLARE @CountryCode VARCHAR(2);
DECLARE CDR_cursor CURSOR FOR SELECT CDRID, dialed_digits FROM mydata.dbo.CDR WHERE DestinationID IS NULL
OPEN CDR_cursor
FETCH NEXT FROM CDR_cursor INTO @CDRID, @dialed_digits
WHILE @@FETCH_STATUS = 0
BEGIN
SET @FormattedNbr = replace(LTRIM(RTRIM(@dialed_digits)), '"', '');
SET @CountryCode = substring(@FormattedNbr, 0, 3);
SET @CodeDestID = null;
SET @MATCH = 0;
DECLARE Dest_cursor CURSOR FOR SELECT DestinationID, Code FROM mydata.dbo.ctryCode WHERE code Like LTRIM(RTRIM(@CountryCode)) +'%' Order by code Desc
OPEN Dest_cursor
FETCH NEXT FROM Dest_cursor INTO @TempCodeDestID, @CtryCode
WHILE @@FETCH_STATUS = 0
BEGIN
IF @MATCH <> 1
BEGIN
SET @MATCH = PATINDEX(@CtryCode + '%', @FormattedNbr);
IF @MATCH = 1
BEGIN
print @TempCodeDestID
SET @CodeDestID = @TempCodeDestID
END
END
FETCH NEXT FROM Dest_cursor INTO @TempCodeDestID, @CtryCode
END
CLOSE Dest_cursor
DEALLOCATE Dest_cursor
IF @MATCH = 1
BEGIN
--Updating the maximum possible match
UPDATE mydata.dbo.CDR SET DestinationID = @CodeDestID WHERE CDRID = @CDRID
SET @CodeDestID = null;
SET @MATCH = 0;
END
FETCH NEXT FROM CDR_cursor INTO @CDRID, @dialed_digits
END
CLOSE CDR_cursor
DEALLOCATE CDR_cursor
SELECT mydata.dbo.CDR.CDRID, mydata.dbo.CDR.start_date_time, mydata.dbo.CDR.ani, mydata.dbo.CDR.dialed_digits, mydata.dbo.CDR.actual_dur, mydata.dbo.CDR.rounded_dur_secs,mydata.dbo.CDR.cos t, mydata.dbo.CtryCode.Destination, mydata.dbo.CtryCode.Code,
mydata.dbo.CtryCode.Cost AS Code_Rate
FROM mydata.dbo.CDR LEFT OUTER JOIN
mydata.dbo.CtryCode ON mydata.dbo.CDR.DestinationID = mydata.dbo.CtryCode.DestinationID
[/code]
can anybody help me please....its urgent
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