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If you run the following code, you will observe that when connected to InsideTSQL2008, sp_Proc1 from InsideTSQL2008 was invoked:

Vendor independence Your system does not exist in a vacuum. Hardware, operating systems, middleware, and networking products all play a role both in enabling and limiting the capabilities of your system. A well-designed system is one that operates in the context of hardware and software vendor implementations, but is not tied to it.

USE InsideTSQL2008; EXEC dbo.sp_Proc1; USE AdventureWorks2008; EXEC dbo.sp_Proc1;

Click Start, point to All Programs, point to Accessories, point to System Tools, and then click Disk Cleanup. In the Disk Cleanup for dialog box, scroll through the content of the Files to delete list. Clear the check boxes in front of files that you don t want to delete, and then click OK. When prompted to confirm that you want to delete the specified files, click Yes.

Drop the InsideTSQL2008 version so that it doesn t interfere with the following examples:

USE InsideTSQL2008; IF OBJECT_ID('dbo.sp_Proc1', 'P') IS NOT NULL DROP PROC dbo.sp_Proc1;

An open system is one in which components can be implemented in different ways and executed in a variety of environments.

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Interestingly, system procedures have an additional unique behavior: They also resolve user objects in the current database, not just system objects . To demonstrate this, run the following code to re-create the sp_Proc1 special procedure which queries a user table called Sales .Orders and to mark the procedure as system:

USE master; IF OBJECT_ID('dbo.sp_Proc1', 'P') IS NOT NULL DROP PROC dbo.sp_Proc1; GO CREATE PROC dbo.sp_Proc1 AS PRINT 'master.dbo.sp_Proc1 executing in ' + DB_NAME(); SELECT orderid FROM Sales.Orders; GO EXEC sp_MS_marksystemobject 'dbo.sp_Proc1';

Run sp_Proc1 in InsideTSQL2008, and you will observe that the query ran successfully against the Sales .Orders table in InsideTSQL2008:

USE InsideTSQL2008; EXEC dbo.sp_Proc1;

If your system is really open, the decisions made by your product vendors are much less of a threat to it over time. This can be essential to the longevity of your system and your reputation as its creator. Addressing the issue of vendor independence is a two-step process. First, you must find vendors who conform to industry-supported standards whenever possible. Is it safer in the long-term to implement a web site in a proprietary scripting language provided by one vendor, or to implement it in Java Server Pages Since you are reading this book, we hope the answer is obvious. The second step is far more crucial. You should make proprietary extensions to standard mechanisms only when absolutely necessary. In such cases, going with a vendor s solution is probably better than inventing your own, because, you hope and expect, they did a lot of thinking about it first. For example, J2EE does not currently address logging requirements, although it will soon. To implement logging in your components, you can either use an existing logging API or create your own. It is probably more expeditious to use what is already available. However, you should always wrap any vendorspecific code in a helper class and access it via a generic interface. That way, changing from the proprietary mechanism to the standard one will be much easier in the future. The Fa ade design pattern is a useful approach. See the bibliography for a list of references on design patterns if you are unfamiliar with this pattern. Embracing proprietary extensions should be avoided whenever possible. The more you do this, no matter how convenient it makes your short-term plans, the more married you are to your original implementation and the more long-term risk there is to the system.

Make a similar attempt in AdventureWorks2008:

USE AdventureWorks2008; EXEC dbo.sp_Proc1;

You get the following error:

Scalability and performance Most system stakeholders want to believe that system use will grow exponentially over time as more business relationships are solidified and users begin to see the subtle genius of the concept. Whether this is true is irrelevant. The danger is that it could be true. And as demand for system resources increases, supply must also increase without negatively impacting performance. Your solution must be scalable.

master.dbo.sp_Proc1 executing in AdventureWorks2008 Msg 208, Level 16, State 1, Procedure sp_Proc1, Line 4 Invalid object name 'Sales.Orders'.

The error tells you that SQL Server looked for a Sales .Orders table in AdventureWorks2008 but couldn t find one . When you re done, run the following code for cleanup:

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