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Although many of the operations you ll regularly perform on a SQL Server installation can be performed through Enterprise Manager, certain operations are easier to perform from a command-based environment. SQL Query Analyzer is an excellent tool for performing ad-hoc queries against a database and for performing administrative functions using Transact-SQL. By using SQL Query Analyzer for executing database commands, you ll be able to see the output of your query in either standard text form or within a grid. (We saw an example earlier in Figure 4-4.) Developers can create some large and complicated queries, so the color-coding features of the SQL code can make managing long statements much easier. SQL Query Analyzer s usefulness doesn t stop there, however.
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In addition to being able to execute ad-hoc queries, you can choose to view graphical statistics on the operations of a query. Later in this chapter, we ll see how this function can be useful for finding performance problems
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Database server security is something that is often ignored. Perhaps one reason is that it is not clearly understood. As emphasized in 3, Data Protection in Windows NT/2000, it is imperative that you secure your operating system resources. Securing your database server platform is equally important. What is the exact relationship between operating system security and database server security The security model of SQL Server 7 includes many features that allow for integrating the two into a common database. Here, we ll examine the various levels of security settings, and explore how they all interact. The main levels that must be considered are as follows: w s s v Operating system security Database logins Database user permissions Object permissions
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To get access to your most trusted information, users will have to be able to jump all four of these hurdles. As a DBA, your job is to ensure that the hurdles are of the proper height that is, your security model takes into account both security and usability. Since they re so important, let s take an in-depth look at each level of permissions. In 3, we looked at some of the measures you can take to secure your network operating system. In this section, let s look at the other levels and how they relate to each other.
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Microsoft has made providing for a single sign-on experience a major design goal in all of its products. Users and systems administrators alike benefit from being able to maintain and use a single account for all operations within the network. To accommodate this, the security architecture of SQL Server 7 supports two security models: w Integrated security mode This method uses built-in Windows NT user accounts that map to database server logins for permissions. In this mode, server logins are created from existing Windows NT group and user accounts. Users who have already been authenticated by an NT Server machine need not enter any more information before connecting to SQL Server. Mixed mode Supported mainly for backward-compatibility, mixed-mode security allows for the use of both integrated security and standard username/ password combinations. Standard logins require the creation of new database server logins, including usernames and passwords within SQL Server itself. Application users can use this information to make a connection with your
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server. The disadvantages of mixed-mode security are the fact that you might have to support two different sets of user databases (one at the operating system level and another within SQL Server). Additionally, users might be forced to enter login information more than once to get access to the resources they require. However, non-Windows client types may not support Windows NT authentication and must use the standard username/password method. You can set the SQL Server Security mode within Enterprise Manager. To do this: 1. Right-click the name of a server and select Properties. 2. On the Security tab, select either SQL Server and Windows NT or Windows NT Only for the Authentication type:
3. Next, you will be able to choose what kind of auditing you want to enable for authentication. The default option is None, but you can choose Success, Failure, or All. Click OK to accept the configuration. Auditing logon information is useful for holding users responsible for their actions and for managing performance (which we ll explore in more detail later in this chapter). If SQL Server is running on a Windows 95/98 machine, users will not be able to use trusted connections. Therefore, Windows NT Authentication is not an available option, and all users who connect to that server will be required to provide a valid login and password.
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