barcode generator vb.net free Interaction with the SQL Server Environment in Software

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You can then copy the database files (in this case, Asset.mdf and Asset_log.ldf) from the \mssql\data folder to a data folder on the target server. To attach the Asset database, you can use
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EXEC sp_attach_db @dbname = 'Asset', @filename1 = 'c:\Program Files\Microsoft SQL', + 'Server\mssql\data\Asset.mdf' @filename2 = 'c:\Program Files\Microsoft SQL' + 'Server\mssql\data\Asset_log.ldf'
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If your database consists of more files, simply add them to the list of parameters. But if your database contains just one data file, you can use an alternative command:
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EXEC sp_attach_single_file_db @dbname = 'Asset', @physname = 'c:\mssql7\data\Asset.mdf'
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You can execute these Transact-SQL statements manually in one of the administrative tools or from the setup program. The setup program can use the command prompt utility isql.exe to run a script file or use ADO to execute the script. Unfortunately, this technique will corrupt links between server logins and database users. Server logins are stored in the master database; on different servers, different logins will have different IDs. Database users are stored in the user database. One of its parameters is the ID of the login to which they are attached. However, that ID refers to a different login on the production server. The simplest ways to handle this problem are either to create all users again using Enterprise Manager or a script that you have prepared in advance, or to use roles instead of users as the foundation of your security solution. See the discussion about security in the following section for more information. SQL Server offers another solution to this problem see Synchronization of Login and User Names later in this chapter. A new feature found in SQL Server 2000 is the Database Copy Wizard. You can use it to copy (or move) a database on a known (production, testing, or some other) server. Behind the scenes, the wizard uses stored procedures for detaching and attaching the database. It also contains features for copying logins, error messages, jobs, and system stored procedures.
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Implementing security on SQL Server is not difficult, but the developer or administrator has to have a good understanding of its security architecture before he or she selects and implements a security solution.
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A user (a person or program) has to go through four levels of security before performing an action on a database object:
Network/OS access
A user needs access to the client computer, operating system, and network on which the server is located. Usually, this access is the
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Interaction with the SQL Server Environment
responsibility of technical support specialists or network administrators. However, in smaller environments, this responsibility may fall to a DBA or developer instead.
Server Access
The first level of security that pertains strictly to SQL Server allows a client to access a server. This security is always the responsibility of database administrators. SQL Server supports three security models:
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SQL Server Authentication Windows NT/2000 Authentication Mixed mode SQL Server and Windows NT/2000 Authentication
The SQL Server Authentication model requires a login and password from each user. These may be different from his or her network login and password and they may be different from one SQL Server to another. This model was the first to be developed; it was implemented by Sybase. Before SQL Server 7.0, it was called standard security. In fact, in SQL Server 7.0 and SQL Server 2000, it is not possible to configure a server to work in this mode only. If SQL Server Authentication is needed, the DBA should configure the server to use Mixed model security. Windows NT/2000 Authentication was introduced by Microsoft. It allows SQL Server logins and passwords to be based on Windows NT network logins and passwords. This practice is easier for both the user (who has to remember only one login and password combination) and the administrator (who can manage all passwords centrally). Before SQL Server 7.0, it was called integrated security. Mixed model SQL Server and Windows NT/2000 Authentication is a combination of the previous two models. It allows some users to log in with their network accounts while other users use their SQL Server logins.
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