Performance Of Extended Stored Procedures In SQL Server 2000
Jul 23, 2005
What is the overhead of using extended stored procedures?
I created a table with 500,000 rows.
1) I ran a select on two columns and it runs in about 5 seconds.
2) I ran a select on one column and called an UDF (it returns a
constant string) and it takes 10 seconds.
3) I ran a select on one column and called a UDF that calls an extended
stored procedure that returns a string and it takes 65 seconds.
I also tried running test 3 with 4 concurrent clients and each client
takes about 120 seconds.
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May 15, 2008
i have created the folowing function but keep geting an error.
Only functions and extended stored procedures can be executed from within a function.
Why am i getting this error!
Create Function myDateAdd
(@buildd nvarchar(4), @avdate as nvarchar(25))
Returns nvarchar(25)
as
Begin
declare @ret nvarchar(25)
declare @sqlval as nvarchar(3000)
set @sqlval = 'select ''@ret'' = max(realday) from (
select top '+ @buildd +' realday from v_caltable where realday >= '''+ @avdate +''' and prod = 1 )a'
execute sp_executesql @sqlval
return @ret
end
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Mar 12, 2007
Can anyone of you help me in finding online - resources to write extended stored procedure for Sql Server 2000 using C#.
Thank you,
Andy Rogers
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Oct 12, 1999
I'm trying to execute an exetended stored procedure from a trigger. The scenario is this: when an input occurs on a table, my trigger is fired, the extended stopred procedure is to be run, and VB app is to be notified that there is new input to process.
Problem is, I can't seem to get the XP to run. I have written a minimal DLL
with VC++ 6, has nothing but the required __GetXpVersion function and the
trigger function, as:
__declspec(dllexport) SRVRETCODE xp_InputAlarm(SRV_PROC *pSrvProc)
{ return XP_NOERROR; }
__declspec(dllexport) ULONG __GetXpVersion()
{ return ODS_VERSION; }
Pretty simple. I have defined the XP in the master database, set the properties point to the DLL. Believe everything is set up properly. However,
when an input occurs, a run-time error is generated on the XP. Attempting to execute it in Query Analyzer gives this error:
"Cannot find the function xp_InputAlarm in the library D:CustomMedInstaCert SourceInputAlarmInputAlaInputAlarm.dll. Reason: 127(The specified procedure could not be found.)."
Which I think means it can't find the proper entry point (xp_InputAlarm) in the DLL. Any help would be greatly appreciated.
mjo
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Jan 6, 2005
Is there any way I can create an SQL script on any extended stored procedures? I need to see what they do. I looked in books online, but it didn't help. Thanks.
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Jun 13, 2001
I am working with Visual Basic and SQL Server 2000. I am looking to convert some of the VB into extended stored procedures, yet everything I've been reading has said that xp's can only be written in C or C++. Is this true??
Thanks.
Caroline Kaplonski
ckaplonski@buckconsultants.com
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Jan 6, 2005
Howdy,
I'm trying to call XP_CMDSHELL from a stored procedure that's not in the Master db. How do I call XP_CMDSHELL? I've tried "Use Master" but I get an error telling me that I can't use "USE" inside of a stored procedure.
Thanks!
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Jul 20, 2005
I am trying to run xp_cmdshell from the Query Analyzer using SQLServer 2000 running on Windows 98.It seems like it should be simple - I'm typingxp_cmdshell 'dir *.exe'in the Query Analyzer in the Master db. I'm logged in as sa.The timer starts running and never stops. No error message.Can anyone PLEASE help me with this? Any suggestions would beappreciated. Are SQL Server 2000 extended stored procedures notsupported in Windows 98? I've tried searching the Knowledge Base butcan't find anything.Thanks!
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Sep 30, 1998
I would like to know if the the DLL`s one can build with VB5/6 can be used to construct Extended Stored Procedures in MS SQLServer 6.5? If so, how does one do this. All the reference material I`ve come across is for C
Thanks in Advance - Ralph
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Sep 30, 1998
I would like to know if the the DLL`s one can build with VB5/6 can be used to construct Extended Stored Procedures in MS SQLServer 6.5? If so, how does one do this. All the reference material I`ve come across is for C
Thanks in Advance - Ralph
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Jul 18, 2007
Hi,
How can I remove access to extended (xp_) stored procedures?
Is there any revoke on <stored_procedure_name> ... command? How can I generate a script of all users who have execute privileges for these procedures? Also, is there any way of restricting (instead of removing) access to those procedures?
Any help will be greatly appreciated!!!
Thanks,
Alla
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Jun 18, 2008
Hi all,
In one of my UDF I use the following functions:
.....
and len(@int_date) = 4
and isnumeric(substring(@int_date,5,6)) = 1
when I use the function I get
Only functions and extended stored procedures can be executed from within a function.
Yes, when I comment the two lines the function works fine.
Ehm.... why can't I use these functions in my function ?
Thanks: Peter
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Jul 20, 2005
Since DBlib is no longer the suggested method for connecting back tosql server from an Extended Stored Procedure, has anyone built anyextended stored procedures that use other connection methods likeOLEDB? Has anyone seen links to any sample extended stored proceduresthat use something other than db-lib? In particular I am interestedin something that connects back to the database as the user whoinvoked the extended stored procedure. I haven't had much luckfinding any.Also, is there an alternative for the bcp api that is a little morecurrent and has support for newer datatypes like bigint? We currentlyuse the bcp api from an extended stored procdure written in C++, butnow need to add bigint support which the bcp api doesn't have.Thanks for any advice.
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Sep 9, 2007
The Extended Stored Procedures (Written in C++ unmanaged code) are supported in SQL Server 2005????
Thanks
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Jun 11, 2007
I have a database script that uses the extended stored procedures sp_OACreate and sp_OCMethod to execute an .exe file. The .exe file is located on the same machine as the SQL Server. At this time it does nothing but log the name of the user calling it.
When I execute the script from Management Studio (logged in as myself) the user being logged as the caller of the .exe is still NT AUTHORITYSYSTEM. I don't know why NT AUTHORITYSYSTEM is the caller, cause the SQL Server service runs under another domain account.
I have tried playing around with EXECUTE AS USER but no matter what, the caller of the .exe is always logged as NT AUTHORITYSYSTEM.
Are there any way I can pass my credentials to the executable that I am calling from the T-SQL script?
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Apr 26, 2004
Is it possible to create an extended stored procedure in C Sharp.
This is for Sql Server 2000.
Books online mentions that you have to use c / c++ to create an extended stored procedure.
However have Microsoft added any support so that the same thing can be done through a simpler language like C Sharp.
Thanks,
Alok.
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Jul 20, 2005
I'm trying to pass parameters to an extended stored procedure, to noavail. I would like to pass two integers to the dll and I have thefollowing three snippets:1. The C++ portion of the dll:....declspec(dllexport) int myAddNumbers(int m, int n)....2. The creation of the extended stored procedure:EXEC sp_addextendedproc myAddNumbers , 'foodll.dll';3. The usage:create function TestFunction()returns integerasbegindeclare @rc integerexec @rc = myAddNumbersreturn (@rc)endHow do any of the above three things need to be modified in order tomake this work?Thanks!!!
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Feb 22, 2008
...we understand that perhaps some xp's might come with the product, but for sp's that we author ourselves, are they two different things in 2005, and if so, why would one be chosen over the other?
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Jun 29, 2007
Our security team wants us to disable access to (or drop) all of the built-in extended stored procedures in MSDE 2000 as they feel it is a vulnerability. Where can I find out which extended procs are safe to disable or how we can disable them during install time? Or, is the security team being too cautious and we should just tell them to leave these intact?
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May 28, 2007
Hi. Does anyone know how to display the results if i execute "xp_fixeddrives, xp_availablemedia and xp_subdirs" commands with VC++ 6.0? I can't obtained the results using Recordset class. Can someone help me? Thank you.
|_N_T_|
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Jul 23, 2005
We have an application that is based on several extended storedprocedures. When we run our application in house, or when most othercustomers run it, they see performance of about X transactions persecond. One customer is seeing performance of about X/5, and I'mhaving a hard time troubleshooting it. The performace bottleneck hasbeen narrowed to the execution of the extended stored procedures. Doesanyone know of tuneable SQL Server parameters that may specificallyaffect the performance of extended stored procedures. I know theprocedures get run by a scheduler. Is there some way the priority orfrequency of the scheduler can be modified? Thanks for any advice.
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Mar 9, 2001
You know this sample ODS dll project:
$80oolsdevtoolssamplesodsxp_hello
I need to find a template like this in Visual Basic.
On this site I read through the xp_Encrypt project which was developed in VB. I did not see source code or a downloadable project file.
My searching on the internet hasn't yielded any practicle results, all examples are either how to use an extended stored procedure or are a MSVC++ project.
Anyone find VB related resources, anywhere? Books, TV, magazines????
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Feb 11, 2004
Hello everybody
I actually wrote a stored procedure (in xp_wrapper.dll) that is using a dll (original.dll) which uses a license file (no file extension).... clear? :)
Anyway.
All the required files are placed in the BINN dir of the server.
The problem is now, that original.dll can't find it's license file. It seems, that this file was not load by SQL Server.
How can I load this file into SQL Server's heap?
Yours
Mike
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Jun 7, 2006
Hi, l've created an function [GSM].[KPIAging], and test it in studio by substitule declare value, i.e.
DECLARE @sCellName VARCHAR(8)
DECLARE @dDate DATETIME
SET @sCellName = "CELL1M_1"
SET @dDate = CAST('06/Jun/2006' AS DATETIME)
EXEC GSM.KPIAging @sCellName, 'CSSR', @dDate
It work fine and return the desired result, but when l used this function in SQL,
SELECT DATEKEY, CELLREGIONKEY, CELL_NAME, CELL_ID, CSSR, GSM.KPIAging(Cell_Name, 'CSSR', @dDate)
FROM GSM.GSMCellDaily_vw
WHERE CSSR BETWEEN 0 AND 85
AND FULLDATE = @dDate
AND CM_SERV > 30
AND (TCH_TRAFFIC > 2 AND TCH_SEIZURES_ATTS > 30)
I got the following error, i.e.
Msg 557, Level 16, State 2, Line 19Only functions and extended stored procedures can be executed from within a function.
Does anyone have any idea on this, and what's the workaround for this?
Thanks you!
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May 7, 2008
Hi mister, I have this script sql but I get this error:
Mens. 557, Nivel 16, Estado 2, Línea 1
Only functions and extended stored procedures can be executed from within a function.
DROP FUNCTION ObtenerTablaPorNombre2
GO
CREATE FUNCTION ObtenerTablaPorNombre2 (@ParamNombreTabla VARCHAR(100))
RETURNS @T Table ( Descripcion VARCHAR(20) NOT NULL, CIF VARCHAR(8) NULL )
AS
BEGIN
DECLARE @cmd nvarchar(max)
DECLARE @params nvarchar(max)
DECLARE @NombreTabla VARCHAR(MAX)
DECLARE @Descripcion VARCHAR(MAX)
DECLARE @CIF VARCHAR(MAX)
SELECT @NombreTabla = [CD_NOMBRE_TABLA], @Descripcion = [DS_CAMPO_DESCRIPCION] , @CIF = [DS_CAMPO_CIF]
FROM [TABLA_MAESTRA] WHERE [CD_NOMBRE_TABLA] = @ParamNombreTabla
SET @cmd = 'SELECT ' + @Descripcion + ',' + @CIF + ' FROM ' + @NombreTabla
--EXEC (@cmd)
SET @cmd = 'SELECT @pDescripcion, @pCIF FROM @pNombreTabla'
SET @params = N'@pDescripcion varchar(100), @pCIF varchar(100), @pNombreTabla varchar(100) '
EXEC sp_executesql @cmd, @params, @pDescripcion = @Descripcion, @pCIF = @CIF, @pNombreTabla = @NombreTabla
RETURN
END
GO
SELECT * FROM [dbo].ObtenerTablaPorNombre2 ('tabla2')
-- Only functions and extended stored procedures can be executed from within a function
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Apr 29, 2004
Hi, all
I'm using Sql server 2000
I want to make select statement dynamically and return table using function.
in sp, I've done this but, in function I don't know how to do so.
(I have to create as function since our existing API..)
Following is my tials...
1.
alter Function fnTest
( @fromTime datetime, @toTime datetime)
RETURNS Table
AS
RETURN Exec spTest @from, @to
GO
Yes, it give syntax error..
2. So, I found the following
From Sql Server Books Online, Remark section of CREATE FUNCTION page of Transact-SQL Reference , it says following..
"The following statements are allowed in the body of a multi-statement function. Statements not in this list are not allowed in the body of a function: "
.....
* EXECUTE statements calling an extended stored procedures.
So, I tried.
alter Function fnTest
( @fromTime datetime, @toTime datetime)
RETURNS Table
AS
RETURN Exec master..xp_msver
GO
It doesn't work... syntax err...
Here I have quick question.. How to execute statements calling an extended stored procedures. any examples?
Now, I'm stuck.. how can I create dynamic select statement using function?
I want to know if it's possible or not..
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Sep 11, 2013
I have this function called fn_GetTimedKey() when I run it in my SQL2005 environment it works fine.
When I run it in my SQL2008R2 environment I get the error:
Only functions and some extended stored procedures can be executed from within a function.
The SQL2008R2 server is new. What can I look for?
Here's the code for the function:
BEGIN
DECLARE @v_Key CHAR(12)
EXEC master..xp_usg_gettimedkey_VAL @v_Key OUTPUT
RETURN @v_Key
END
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Dec 11, 2006
Hi,
I am trying to run a stored procedure in SQL 2005 which calls a registry value using the RegRead stored procedure which in conjunction executes a line of code. This stored procedure has previously worked in both Sql 7/2000.
However, I am getting the following error when trying to run it in SQL 2005:
Msg 22001, Level 16, State 1, Line 0
xp_regread() returned error 5, 'Access is denied.'
Does anyone know if Extended Stored Procedures are supported in SQL 2005?
Thanks,
V.
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Mar 31, 2005
Is there any way to make MS SQL Server 2000 to perform some stored procedures, say 3 times a day? If so, how? Thanks.
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Dec 12, 2006
sivanantham writes "How to create Stored Procedures in SQL Server 2000?
also give me samples with Cursors and all
Thanks
Sivanantham"
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Jan 22, 2007
HiI'm running a Windows 2000 SP4 Server which has SQL Server 2000 SP4running.My problem is whenever i try to import a database over from one serverto the other the tables/data etc imports but the stored procedures andviews are not imported over and when i try to select these to importthey do not appear in the list. Any ideas on whats up?Many Thanks in advanceT
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May 27, 2004
Hi, im developing an action site and im having proplems with stored procedures
that are causing extreme load on the server.
PLEASE LOOK AT THE CODE AND TELL ME IF U SEE ANYTHING THAT CAUSES LOW PERFORMANCE OR SOME SUGGESTIONS ON HOW TO INCREASE THE PERFORMANCE.
SHOULD I F.E. TAKE THIS LOGIC FROM THE DB AND TRY DOING IT IN c#?
The action-site uses an auto-bid-feature that is causing a load.
Basically when a user makes a bid, i have to loop through all other users that have a bid in
the product and automatically increase a bid untill it matches the highest bid of a user.
F.e. a user bids auto-bid $2000 in a product where another user has a $2100 bid in the product and the current bid is $1200. So the SP loops through the users increases the bid-history untill it mathces the highest bid of a user.
- $1250
- $1300
- $1350
- etc...
This is the SP that loops through the users and calls another function each time to increase the bid in the bid-history.
------------------------------------------
CREATE PROC HaekkaBodIUppbodi
@uID INT
AS
DECLARE @curUpphaed DECIMAL
SELECT @curUpphaed = MAX(upphaed) FROM bodsaga WHERE uppbod_ID = @uID
IF(@curUpphaed IS null)
BEGIN
SET @curUpphaed = 0
END
DECLARE @curCount INT
SELECT @curCount = COUNT(kaupandi_netfang) FROM bod WHERE upphaed >
@curUpphaed AND uppbod_ID = @uID
WHILE(@curCount>0)
BEGIN
-- skilgreinum notanda breytu
DECLARE @notandi NVARCHAR(255)
IF(@curCount<2)
BEGIN
SELECT @notandi = kaupandi_netfang FROM bod WHERE upphaed >
@curUpphaed AND uppbod_ID = @uID
EXEC HaekkaBodAVoru @uID, @notandi
BREAK;
END
-- búum til cursor fyrir alla notendur
-- sem eru með hærri boð en núverandi boð
DECLARE crs CURSOR FAST_FORWARD FOR
SELECT kaupandi_netfang FROM bod WHERE upphaed > @curUpphaed
AND uppbod_ID = @uID
ORDER BY dags
-- opnum cursorinn
OPEN crs
-- sækjum fyrsta notandann inn í @notandi
FETCH NEXT FROM crs
INTO @notandi
DECLARE @returnValue INT
SET @returnValue = 0
DECLARE @tempValue INT
SET @tempValue = 0
-- lúppum í gegnum notendurna
WHILE @@FETCH_STATUS = 0
BEGIN
EXEC HaekkaBodAVoru @uID, @notandi
FETCH NEXT FROM crs
INTO @notandi
END
CLOSE crs
DEALLOCATE crs
-- sækjum hæstu upphæð í boðsögu
SELECT @curUpphaed = MAX(upphaed) FROM bodsaga WHERE uppbod_ID = @uID
SELECT @curCount = COUNT(kaupandi_netfang) FROM bod WHERE upphaed >
@curUpphaed AND uppbod_ID = @uID
END
GO
-------------------------------------------------------------
And here is the SP that increases the bid...
CREATE PROC HaekkaBodAVoru
@uID INT,
@notandi NVARCHAR(255)
AS
-- Hækkun á uppboði
DECLARE @haekkun DECIMAL
SELECT @haekkun = haekkun_upphaed
FROM uppbod WHERE id = @uID
-- Hæsta boð í vöru
DECLARE @haesta_bod DECIMAL
SELECT @haesta_bod = MAX(upphaed) FROM bodsaga
WHERE uppbod_id = @uID
-- Hæsta boð sem notandi vill gera
DECLARE @haesta_bod_notanda DECIMAL
SELECT @haesta_bod_notanda = upphaed FROM
BOD WHERE kaupandi_netfang = @notandi
-- Seinasti notandi sem gerði boð í uppboðinu
DECLARE @seinasti_notandi NVARCHAR(255)
SELECT @seinasti_notandi = notandi FROM
BODSAGA WHERE uppbod_id = @uID
DECLARE @upphaed DECIMAL
SET @upphaed = @haekkun
-- Ef búið að bjóða í vöruna
IF(@haesta_bod IS NOT null)
BEGIN
IF(@haesta_bod = @haesta_bod_notanda)
BEGIN
SET @upphaed = @haesta_bod
END
ELSE
BEGIN
SET @upphaed = @haesta_bod + @haekkun
END
END
-- Ef hæsta boð notanda er sama eða lægra en núverandi verð
-- og notandi var ekki sá síðasta til þess að setja inn boð
IF(@upphaed <= @haesta_bod_notanda)
BEGIN
-- Ef notandi hefur EKKI sett inn þessa upphæð áður...
IF((SELECT COUNT(*) FROM bodsaga WHERE notandi = @notandi AND upphaed = @upphaed)=0
-- Og notandi á EKKI núverandi hæsta boð
AND (SELECT COUNT(*) FROM bodsaga WHERE notandi = @notandi AND upphaed = @haesta_bod)=0)
BEGIN
INSERT INTO bodsaga
VALUES(@uID, @notandi, @upphaed, GETDATE())
RETURN 1
END
END
RETURN 0
GO
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Jul 31, 1998
I`ve written a pretty complex powerbuilder application and my performance
is fair use stored procedures. Is there any way to force sql server 6.5
to reevaluate the current query plan and if it is bad create a new
query plan.
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