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2: The SQL Server Environment
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osql isql SQL Server Profiler Client Network Utility Server Network Utility The following sections discuss the preceding tools as well as online resources.
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The SQL Server database server is implemented as the following services: SQL Server (MSSQL) SQL Server Agent (SQLAgent) Distributed Transaction Coordinator (MSDTC) SQL Mail The database server is actually implemented as the SQL Server (MSSQL) service. It receives queries from users, executes them, sends responses to calling applications, and manages data in database files. SQL Server Agent (SQLAgent) is an automation service that manages the scheduled execution of tasks and notifies administrators of problems that occur on the server. Distributed Transaction Coordinator (MSDTC) is a service that manages two-phase commit transactions spanned over multiple servers. This service ensures that changes that need to be made to data stored on different servers complete successfully. SQL Mail is used to send and receive e-mail. It is possible to configure SQL Server to perform such tasks as receiving requests and returning result sets through e-mail to notify administrators of the success status of scheduled tasks and of encountered errors. On Windows NT Server and Windows 2000 Server, MSSQL, SQLAgent, and Distributed Transaction Coordinator services can be started or stopped, as can any other service, using the Services icon in Control Panel. In Windows 9x environments, the only way to start and stop these services is to use Service Manager. On Windows 2000, you can also use the net start command from the command prompt. SQL Mail service can be controlled from the Support Services node in Enterprise Manager. You will see in the Enterprise Manager section later in this chapter how to control SQL Mail.
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When the Service Manager applet is running, you can choose the current service and server using combo boxes and then use the appropriate button to start, pause, or stop the current service.
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During SQL Server installation, Service Manager is set to run minimized in the system tray. You can investigate the execution status of the current service by hovering the mouse pointer over the icon in the system tray, or by right-clicking the icon and selecting Properties from the pop-up menu. The icon will be displayed with a green arrow if running, and a red block if not running.
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Query Analyzer is a Windows application for designing, debugging, and executing Transact-SQL (T-SQL) statements (such as queries) against a SQL Server database. This application is a descendant of isql (a text-based tool) and ISQL/W (a Windows-based tool). Before Enterprise Manager was introduced in SQL Server 6.0, administrators relied on isql to manage servers and databases and to execute queries. Query Analyzer is an MDI application that can contain one or more Query windows. You can use Query windows to enter and execute a batch of Transact-SQL statements. The Query window contains two major components: the Query pane and the Results pane (see Figure 2-1). The Query pane is a Transact-SQL syntax-sensitive editor. Because it is syntaxsensitive, users can type Transact-SQL statements in the pane and Query Analyzer uses different colors to distinguish keywords, variables, comments, and constants.
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2: The SQL Server Environment
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Object Browser
Query pane
Query Analyzer toolbar
Results pane
Figure 2-1
Query Analyzer
The Results pane displays the result of the code executed in the Query pane. Earlier versions of SQL Server displayed results only in the form of text. Since SQL Server 7.0, Query Analyzer has been able to display result sets in the form of a grid, display messages separately, and diagram the way that SQL Server will execute the query (that is, the execution plan). The Query Analyzer toolbar contains icons for managing the contents of the window. A noteworthy option is the DB combo box, which selects and displays the current database. The Object Browser is a window that allows users to explore database objects or access predefined Transact-SQL code templates. Users can check for the existence of a database object; explore its contents (that is, view records in a table); execute and debug objects such as stored procedures; view the structure and dependencies of an object; view and edit extended properties of the object; drag the name of a
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