How To Reduce The Time When Using A Variable
Jun 9, 2006
Hi,
I have a table with column value like '123 345 678 143 648' like that. What I need to do is I have to take each code value and put it as a new record in another table. So, if I say 'Select substring(column_name,1,3) from table' then it is very fast (fraction of second). But since I need to take each code and the # of codes in each record may vary, I am using a while loop to take each code and so I delclared a variable @i and now my select statement is like this: 'Select substring(column_name,@i,3) from table'. Interesting now this select statement is taking almost 2 mins for each iteration.
Why it is like this? Is there any way I can reduce the time taken to execute each iteration?
Thanks.
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Apr 2, 2008
Hello all,
Mine below function takes much time at every execution. It takes 0.18 sec to retrive 984 rows.
Can any one help me, how to reduce execution time?
"Create function [dbo].[Fn_Get_Consensus_Curve_41_Data]
(@p_Location_Code nvarchar(10), @p_Sector_Id int, @p_Match_Date DateTime ,@p_UserID int , @p_CustId int)
RETURNS @Temp_Curve_Submission_Data table
(
Location_Codenvarchar(10),
Sector_Idint,
MatchDatedatetime ,
EntityIdint ,
CustomerIdint,
MaturityDatedatetime ,
Cust_Pricefloat ,
Bid_Pricefloat ,
Offer_Pricefloat ,
Consensus_Mid_Price float ,
Tickernvarchar(20) ,
Cust_Mnemonicnvarchar(50) ,
Currency_Idint
)
as
BEGIN
/*
GO
IF (EXISTS (SELECT name
FROM sysobjects
WHERE (name = N'Fn_Get_Consensus_Curve_41_Data')
AND ((type = 'P') OR (type = 'IF') OR (type = 'TF') OR (type = 'FN'))))
DROP FUNCTION [dbo].Fn_Get_Consensus_Curve_41_Data
GO
*/
declare @p_ENTITYID INT
declare @p_CUSTOMERID INT
Declare @p_Login_Type int
Declare @p_Result_Status int
set @p_Login_Type = (SELECT DBO.GET_USER_LOGIN_TYPE_ID(@p_UserID))
If @p_Login_Type=1 and not (@p_CustId is null or @p_CustId='')
Set @p_Result_Status = 1
Else if @p_Login_Type > 1
Set @p_Result_Status = 2
Else
Set @p_Result_Status = 0
If @p_Result_Status > 0 -- if user is valid and given enough parameters than
Begin
If @p_Result_Status = 1 -- if User is trader and gives customer id
Begin
Declare Cur_Fetch_Curve_Cust_Data cursor for
Select Distinct Customerid
From PricesRR PRR
Where
Convert(Nvarchar,Matchdate,101) = Convert(Nvarchar,@p_Match_Date,101) And
Sector_Id = @p_Sector_Id And
Location_Code = @p_Location_Code And
CustomerID = @p_CustId And
--CustomerID <> 0
--CustomerID not in (0, -1, -2, -3, -100, -200)
CustomerId Not In (Select CustomerId From Fn_Get_PricesRR_Not_To_Include_Cust_Id('V'))
and isnull(PRR.Record_Last_Action,'N') <> 'D'
and Version = dbo.GET_PRICESRR_MAX_VERSION(@p_Location_Code, @p_Sector_Id, @p_Match_Date, PRR.EntityID, @p_CustId, PRR.Date)
Declare Cur_Fetch_Curve_Entity_Data cursor for
Select Distinct EntityID
From PricesRR PRR
Where
Convert(Nvarchar,Matchdate,101) = Convert(Nvarchar,@p_Match_Date,101) And
Sector_Id = @p_Sector_Id And
Location_Code = @p_Location_Code
AND EntityId IN ( Select Distinct Entity_Id from Fn_Get_Allowed_Entity_List(@p_Location_Code , @p_Sector_Id , @p_Match_Date ,@p_UserID ))
and isnull(PRR.Record_Last_Action,'N') <> 'D'
and Version = dbo.GET_PRICESRR_MAX_VERSION(@p_Location_Code, @p_Sector_Id, @p_Match_Date, PRR.EntityID, @p_CustId, PRR.Date)
End
Else If @p_Result_Status = 2 -- if User is higher than trader.. means broker or higher
Begin
Declare Cur_Fetch_Curve_Cust_Data cursor for
Select Distinct Customerid
From PricesRR PRR
Where
Convert(Nvarchar,Matchdate,101) = Convert(Nvarchar,@p_Match_Date,101) And
Sector_Id = @p_Sector_Id And
Location_Code = @p_Location_Code And
--CustomerID <> 0
--CustomerID not in (0, -1, -2, -3, -100, -200)
CustomerId Not In (Select CustomerId From Fn_Get_PricesRR_Not_To_Include_Cust_Id('V'))
and isnull(PRR.Record_Last_Action,'N') <> 'D'
--and Version = dbo.GET_PRICESRR_MAX_VERSION(@p_Location_Code, @p_Sector_Id, @p_Match_Date, PRR.EntityID, @p_CustId, PRR.Date)
Declare Cur_Fetch_Curve_Entity_Data cursor for
Select Distinct EntityID
From PricesRR PRR
Where
Convert(Nvarchar,Matchdate,101) = Convert(Nvarchar,@p_Match_Date,101) And
Sector_Id = @p_Sector_Id And
Location_Code = @p_Location_Code
and isnull(PRR.Record_Last_Action,'N') <> 'D'
--and Version = dbo.GET_PRICESRR_MAX_VERSION(@p_Location_Code, @p_Sector_Id, @p_Match_Date, PRR.EntityID, @p_CustId, PRR.Date)
End
delete from @Temp_Curve_Submission_Data
-----------------------
-----------------------
Open Cur_Fetch_Curve_Cust_Data
fetch next from Cur_Fetch_Curve_Cust_Data
into @p_CUSTOMERID
WHILE @@FETCH_STATUS = 0
BEGIN
IF @@FETCH_STATUS <> 0 break
BEGIN
-----------------------
-----------------------
Open Cur_Fetch_Curve_Entity_Data
fetch next from Cur_Fetch_Curve_Entity_Data
into @p_ENTITYID
WHILE @@FETCH_STATUS = 0
BEGIN
IF @@FETCH_STATUS <> 0 break
-----------------------
Insert Into @Temp_Curve_Submission_Data
(
Location_Code ,
Sector_Id,
MatchDate ,
EntityId ,
CustomerId ,
MaturityDate ,
Cust_Price ,
Bid_Price,
Offer_Price,
Consensus_Mid_Price ,
Ticker ,
Cust_Mnemonic ,
Currency_Id
)
select
@p_Location_CodeLocation_Code,
@p_Sector_IdSector_Id,
X.MatchDateMatch_Date,
X.EntityIdEntity_Id ,
X.CustomerIdCustomer_Id,
X.MaturityDateMaturity_Date,
X.PriceCust_Price,
X.BidValueBid_Price,
X.OfferValueOffer_Price,
DBO.GET_Consensus_MID ('V',@p_Location_Code , @p_Sector_Id , @p_Match_Date, @p_ENTITYID ,x.MaturityDate) Consensus_Mid_Price,
--DBO.GET_Consensus_MID ('B1',@p_Location_Code , @p_Sector_Id , @p_Match_Date, @p_ENTITYID ,x.MaturityDate) Consensus_Mid_Price,
X.TickerTicker ,
X.MnemonicCust_Mnemonic,
X.Currency_Id
from
(
SELECT
row_number() over (order by maturitydate) Line_No,
a.* ,
b.ticker,
c.mnemonic
from Fn_Get_Tot_Curve_41_Date(@p_Location_Code, @p_Sector_Id, @p_Match_Date, @p_ENTITYID , @p_CUSTOMERID ,@p_UserID ) a,
referenceentity b,
(
select customerid, mnemonic
from customersrr
group by customerid,mnemonic
) c
where
a.customerid = c.customerid and
a.EntityID=b.CMAID
--order by maturitydate
) X
-----------------------
Fetch Next From Cur_Fetch_Curve_Entity_Data
Into @p_ENTITYID
END
CLOSE Cur_Fetch_Curve_Entity_Data
END
-----------------------
-----------------------
Fetch Next From Cur_Fetch_Curve_Cust_Data
Into @p_CUSTOMERID
END
deallocate Cur_Fetch_Curve_Entity_Data
CLOSE Cur_Fetch_Curve_Cust_Data
deallocate Cur_Fetch_Curve_Cust_Data
End
return
end
"
Prashant Hirani
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