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Before Query Analyzer (and ISQL/W ISQL for Windows), DBAs used a command line utility called isql to run Transact-SQL statements against the server (see Figure 2-6). Tools such as isql are reminiscent of UNIX environments, and they are seldom used now that GUI applications like Query Analyzer are available. Another tool that works from the command prompt is osql. It was introduced in SQL Server 7.0. The major difference between these two command line utilities lies in the API each uses to connect to SQL Server databases: osql uses ODBC to connect, and isql uses DB-Library.

2:

Figure 2-6.

SQL Server Profiler is a component of SQL Server designed to monitor activities on servers and in databases (see Figure 2-7). Before SQL Server 2000 and SQL Server 7.0, this utility was called SQL Trace. Users can use this utility to capture queries against a database, the activities of a particular user application, login attempts, failures, errors, and transactions. It is often used to improve the performance of a system.

You cannot define the nullability of the variable, as you can with table columns. This does not mean that variables cannot contain null values. In fact, before assignment, the value of each variable is null. It is also possible to explicitly set the value of each variable to null.

SQL Server client tools can use different protocols to communicate with SQL Server:

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The account should always be set so that the password does not expire. The account should not be set up using an account template. The account should not have any denied logon hours. Administrators should implement a plan for changing the password of system accounts to prevent security breaches. Administrators who have enabled auditing should watch the service accounts as well as user accounts for unauthorized attempts to access restricted areas. Service accounts should have nondescript names in environments where security is a concern because intruders will look for service accounts due to their high levels of access.

Figure 2-7.

For each protocol, Microsoft has designed a DLL communication library that is referred to as a Network Library or NetLib. The Client Network Utility is designed to select the protocol and NetLib to be used by other client tools. It is possible to specify a default network library and exceptions on a per-server basis:

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Traditionally, due to the nature of the environment, SQL Server client tools (including Enterprise Manager and Query Analyzer) have been light on context-sensitive help, but SQL Server has a subsystem that is a great tool for browsing through its documentation SQL Server Books Online. This subsystem contains the complete set of documentation which used to be delivered on paper in the form of an online, searchable, indexed hierarchy of documents. You can start SQL Server Books Online by selecting Start | Programs | Microsoft SQL Server 2000 | Books Online (see Figure 2-8). You can browse through the Contents of the hierarchy as in Windows Explorer, or you can switch to the Index tab to see a list of keywords or the Search tab to define search criteria. The Favorites tab enables you to record pages that you want to refer to later.

There are several ways to assign a value to a local variable. In early versions of SQL Server, the only way to do this was to use a modification of the Select statement:

Microsoft has developed technology that enables developers to encapsulate executable code/objects into code components. They can be used from programs developed in the same or any other programming language that supports these kinds of objects. Through the years, this technology has been known by different names: OLE, OLE Automation, COM, DCOM, Automation, ActiveX, COM+ (and the saga continues). SQL Server can initiate code components and access properties and methods encapsulated in them. There is a set of system stored procedures (with the prefix sp_OA ) designed to accomplish such tasks.

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NOTE: When Microsoft first unveiled this feature in SQL Server, code components were known as OLE Automation objects. For this reason, Microsoft attached the OA prefix to these stored procedure names, and I continue this usage in this section s heading.

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