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Getting Started with SQL Server Express
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he overall goal of this chapter is to get you started with SQL Server Express (SSE) by answering two overall questions: What is SQL Server Express good for, and who should use it How do you install, configure, and get started using SQL Server Express The first two main sections in this chapter directly address the first question. The description of SQL Server Express users conveys an appreciation of the wide range of audiences and applications that SQL Server Express can serve. The chapter s third and fourth main sections contrast SQL Server Express with alternative database servers to clarify further the special benefits that SQL Server Express brings to the use of databases in organizations. Although SQL Server Express is technically a server application, it can run on workstation computers. See the Performing a System Check for SQL Server Express section for more detail of SQL Server Express requirements. The last three main sections address the second question, first, by showing you how to install a SQL Server Express instance. SQL Server Express is a server application, and you consequently need a client application to take advantage of it. Therefore, this chapter then shows you how to do the following: Use a query tool adapted for use with SQL Server Express from the other SQL Server 2005 editions. This new query tool helps you program SQL Server Express with Transact-SQL (T-SQL), the special SQL (Structured Query Language) variant for Microsoft SQL Server. Use SQL Server Express with down-level, or legacy, clients. These may be the client applications or similar applications that you are currently using with SQL Server 2000 or SQL Server 7. Part 2 of the book drills down on Visual Basic Express and Visual Web Developer Express and explains how to use these applications with SQL Server Express.
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What Is SQL Server Express
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SQL Server Express is the database component for the 2005 Express suite components from Microsoft. Other components in the suite include Visual Basic Express Visual Web Developer Express Visual C# Express, Visual C++ Express, and Visual J# Express
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CHAPTER 1 GETTING STARTED WITH SQL SERVER EXPRESS
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SQL Server Express is based on SQL Server 2005 technology. It uses the same database engine but is limited to 1 CPU, 1GB of RAM, and a maximum database size of 4GB. Although SQL Server Express explicitly removes the workload governor associated with MSDE, SQL Server Express still explicitly targets nonenterprise solutions. It is available free of charge, and it is designed to efficiently support smaller-scale database applications, with a definite emphasis placed on ease of development and use. Just as MSDE versions offered a subset of the functionality of SQL Server 7 and 2000, so SQL Server Express offers a significant subset of SQL Server 2005 database engine features. However, given that SQL Server 2005 represents a major upgrade from SQL Server 2000, SSE also represents a major upgrade from MSDE with, among other things, a significantly expanded security model, enhanced techniques for handling large objects in either string or binary format, a hosted .NET CLR in the server, and the availability of new XML data types with supporting data. However, SSE does lack many of the enterprise features of other SQL Server 2005 editions. As mentioned, SSE also places a much larger emphasis on ease of use and security. The following GUI components are freely available for use with SQL Server Express: SQL Server Express query tool: The new query tool enables developers and other users to write and save queries in T-SQL. SQL Server Configuration Manager: Another new client application for starting, stopping, and configuring an SSE instance (see the Configuring SQL Server Express for Network Access section for more on this client application). SQL Server 2005 Surface Area Configuration: Another new client tool that overlaps somewhat with SQL Server Configuration Manager, but provides additional capabilities for managing the availability of SQL Server Express features. XCopy deployment dramatically simplifies copying a database between folders on the same computer or different computers. With XCopy deployment, you can copy or move database files so long as a database is not being actively used by an SSE instance. Earlier versions of SQL Server and even other editions of SQL Server 2005 do not release their database files so long as a SQL Server instance is running without the invocation of a special instruction (namely, sp_detach_db). XCopy deployment in SSE eliminates the need to invoke the sp_detach_db system-stored procedure, as well as the need to subsequently reattach database files to a SQL Server instance so that users can work with the database again. Three SQL Server Express features support XCopy deployment: the availability of an AttachDBFileName argument for the connection string, the lack of the requirement to specify a logical database name, and the auto-close feature. Use the AttachDBFileName argument to point a connection string at a database file by its path and file name on the local computer. SQL Server Express can automatically create a logical database name based on the AttachDBFileName argument. In contrast, MSDE (and other editions of SQL Server 2005 besides SSE) require the designation of an explicit logical name through the Initial Catalog or Database connection string argument. The auto-close feature releases the locks on database files after the application using a database file closes. Invoking the Close method for an open connection merely returns a connection to the server instance s connection pool. The connection can remain open at the server until the connection item in the pool times out. ADO.NET developers can invoke the ClearPool method of a SQL Connection instance to remove a connection from the connection pool after invoking the Close method.
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