Skip to main content

Don't start the user defined stored procedure with "SP_"

As you might be knowing the system stored procs would be prefixed with "SP_". If we prefix "sp_" in our user-defined stored procedure it would bring down the performance because SQL Server always looks for a stored procedure beginning with "sp_" in the following order:

1) Master DB,
2) The stored procedure based on the fully qualified name provided,
3) The stored procedure using dbo as the owner, if one is not specified.

So, when you have the SP with the prefix "sp_" in the DB other than master, the Master DB is always checked first, and if the user-created SP has the same name as a system stored proc, the user-created stored procedure will never be executed.

For example, Let's say that by mistake you have named one of your user defined stored procedure as "sp_help" within the database!

Create proc sp_help
as
Select * from dbo.empdetails

Now when you try executing the stored procedure using the below script you would realize that it has actually called the sp_help system stored proc of Master DB and not your SP.

Exec sp_help

Hope this helps!!

Technorati tags: , , ,
Labels:

Comments

Post a Comment

Popular posts from this blog

My Wedding Anniversary :)

Six years back on the same day I married Sai Lakshmi (12-July-2000). I know Sai for almost 13 years now :) I fell in love with her during my 12th standard. I know @ 17 yrs any person wouldn't be matured enough to make a big decision like this. But thank God my choice was perfect :) Even now, very often we used to think about the past and laugh at our behaviors/actions then. My love story would be really interesting (at least for me and Sai :)) and I am sure none of you guys would be interested in reading about it so lemme not get into it in-depth. But one thing which I want to share is "Without Sai, I wouldn't have entered into the IT field at all". She was instrumental in convincing me to study my Master's degree in Computer Application. That's the move that changed my career. Till my schooling, my dream was to either become a "big" sportsman (Cricket and Badminton were my favorites at that time.) or an Aeronautics engineer. Unfortunately, my l...
40 comments
Read more

Script table as - ALTER TO is greyed out - SQL SERVER

One of my office colleague recently asked me why we are not able to generate ALTER Table script from SSMS. If we right click on the table and choose "Script Table As"  ALTER To option would be disabled or Greyed out. Is it a bug? No it isn't a bug. ALTER To is there to be used for generating modified script of Stored Procedure, Functions, Views, Triggers etc., and NOT for Tables. For generating ALTER Table script there is an work around. Right click on the table, choose "Modify" and enter into the design mode. Make what ever changes you want to make and WITHOUT saving it right click anywhere on the top half of the window (above Column properties) and choose "Generate Change Script". Please be advised that SQL Server would drop actually create a new table with modifications, move the data from the old table into it and then drop the old table. Sounds simple but assume you have a very large table for which you want to do this! Then it woul...
2 comments
Read more

What should one look @ while buying a land in chennai?

Offlate people have started thinking about investing their money in lands. I too think that to be a wise decision only! As most of us know buying a land in chennai (for that matter any where in the world) isn't an easy affair. I was just wondering what all one needs to look at before deciding to purchase a land. I thought I would put down what ever I know about this subject here. [Guys pls free to correct me if I my understanding is wrong somewhere. That way, it would help me understand as well as others who might read this in future]. Here we go ... 1. One should not buy farm lands if they want to build a residential house sometime later there. Because to my knowledge its illegal to build residential houses on lands meant for irrigation. 2. Encumberance Certificate -- This is what is shortly refered as "EC". One needs to get an EC from local sub registrar office (i guess we need pay a small amount for this). From this we / our lawyers :) can find out whether the guy who ...
34 comments
Read more