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You could store XML data in columns with a text data type, but your application had to retrieve the data as text and then parse it as XML. No support existed for direct querying of the XML data within the SQL Server. However, you were able to return SELECT statement results sets as XML using the FOR XML clause. SQL Server 2005 takes XML support to the next level. You can store the data in an XML data-typed column, and you can use the XQuery subset of the SQL/T-SQL language in order to retrieve only the XML values you require.

First, developers can change the database without necessarily rewriting all of the code at the web server. This 20 Chapter 1 Understanding SQL Server’s Role n benefit assumes that a standard data access method was used between the web server and the database. Second, the developers can completely change the look and feel of the application without changing any of the data. In 3-, 4-, and more-tier implementations, the solution is even more componentized and the result is greater flexibility in the solution over time.

The new Database Mail solution is both more efficient and less annoying than the older SQL Mail alternative. 1 2 ​ ​The SQL Server 2005 Database Mail Configuration Wizard Dedicated Administrator Connection The dedicated administrator connection (DAC) allows you to connect to a SQL Server system that is not responding to normal connections. The DAC is available through the new SQLCMD command-prompt tool and can only be initiated by the members of the sysadmin server role. Once connected, you can execute standard diagnostic commands, such as basic DBCC commands and potentially data-query commands.

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