External stored procedure, performance?

Hi everybody,
I should begin to write a DLL library for Sql2000 server.
The functions I like to implement are mathematical functions, like standard
deviation, and similar, nothing really complex. Often I have to use more
then one standard deviation inside the sama function, using subset of a
record set.
Of course I can use sql2000, that implemets standard deviation and basic
mathematical function, so the question is: is it opportune to write a DDL to
improve performance, or is it worse, or just the same?
thanks a lot for any kindly advice
cesareI think the key words here are "using a subset of a recordset". Based on
that I would implement it in T-SQL, or on the application side but not in an
XP. The cost of connecting back to the SQL Server to grab a subset of rows
is going to be big, especially if you perform this std dev calc several
times in a row.
"Cesare" <cvairetti@.mcgestioni.it> wrote in message
news:uO9XdpvjGHA.1640@.TK2MSFTNGP02.phx.gbl...
> Hi everybody,
> I should begin to write a DLL library for Sql2000 server.
> The functions I like to implement are mathematical functions, like
> standard
> deviation, and similar, nothing really complex. Often I have to use more
> then one standard deviation inside the sama function, using subset of a
> record set.
> Of course I can use sql2000, that implemets standard deviation and basic
> mathematical function, so the question is: is it opportune to write a DDL
> to
> improve performance, or is it worse, or just the same?
> thanks a lot for any kindly advice
> cesare
>sql

External Procedure error

I'm trying to compile the following function:

CREATE OR REPLACE FUNCTION shell(cmd IN VARCHAR2)
RETURN PLS_INTEGER
AS
EXTERNAL LIBRARY EXTPROCSHELL_LIB
NAME "extprocsh"
LANGUAGE C
PARAMETERS (cmd STRING);

but keep getting an error that says EXTPROCSHELL_LIB needs to be declared. Somewhere I read that this probably means that the shared library doesn't exist and try recreating it.

Our DBA assures me that he created the library in the Oracle home lib directory and I do see the compiled C program there and also saw the path of his library creation and everything looks fine.

Any suggestions here?Hello,

do you have created a library object with the same name ?
See "CREATE LIBRARY ..."

The error you have posted does not mean, that you dont have created the lib in the oracle directory.
Its says, that Oracle can not find the library object that points to the library in the oracle directoy ...

Hope that helps ?

Manfred Peter
Alligator Company GmbH
http://www.alligatorsql.comsql

Extended stored procedure, performance?

Hi everybody,
I should begin to write a DLL library for Sql2000 server.
The functions I like to implement are mathematical functions, like standard
deviation, and similar, nothing really complex. Often I have to use more
then one standard deviation inside the sama function, using subset of a
record set.
Of course I can use sql2000, that implemets standard deviation and basic
mathematical function, so the question is: is it opportune to write a DDL to
improve performance, or is it worse, or just the same?
thanks a lot for any kindly advice
cesare"Cesare" <cvairetti@.mcgestioni.it> wrote in message
news:et2MIqvjGHA.4304@.TK2MSFTNGP03.phx.gbl...
> Hi everybody,
> I should begin to write a DLL library for Sql2000 server.
> The functions I like to implement are mathematical functions, like
> standard
> deviation, and similar, nothing really complex. Often I have to use more
> then one standard deviation inside the sama function, using subset of a
> record set.
> Of course I can use sql2000, that implemets standard deviation and basic
> mathematical function, so the question is: is it opportune to write a DDL
> to
> improve performance, or is it worse, or just the same?
>
Extended stored procedures are so dangerous to the stability of the database
server that they should be used very, very carefully.
In SQL 2005 CLR integration provides a safe way to extent the SQL engine
with custom calculations.
David