What Is a "Secure" System?
Before we wade hip-deep into a discussion of the technical merits of SQL Server 2005 Express Edition and how to configure its security features, I think it makes sense to define what security really means. Sure, for a small business or departmental system, when the data server is compromised or its data is lost or corrupted, the company is just as vulnerable to failure as a large one. SQL Server Express can reside on a Web server to provide SQL Server services for ASP applications. Therefore, uptime, reliability, and security also mean the ability to expose information to Web server applications, but not be vulnerable to Web-sourced attacks. SQL Server Express is also ideal for the "paradeveloper" who writes code and builds applications as a sideline. These doctors, lawyers, receptionists, and taxicab drivers all need a simple, safe and reliable way to store and retrieve data without having to worry about what's being done for them behind the scenes.

Security also includes those steps the application designer and developer take to prevent data loss, whether that loss is due to accident, neglect, or malicious attack. Security means keeping out those that should not have access to the data, and protecting the physical files and the system itself. It means making backups and being able to perform restores seamlessly. With SQL Server Express systems, this is especially challenging, because as often as not, there won't be a dedicated systems administrator or IT department to step in and perform periodic backups or put the system back together from the pieces when it falls over. Having a secure system means you keep your job (and perhaps get a promotion) when problems occur and your application recovers quickly, quietly, and efficiently. I'll point out a number of things you can do to make your applications more durable, less prone to attack, and easier to maintain.



source : http://msdn2.microsoft.com/en-us/sqlserver/aa336270.aspx

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