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A SQL Server script
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SQL Server 7 Backup & Recovery
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Each of the preceding methods has its strengths and weaknesses, depending on the exact task you re trying to perform. In most cases, you ll have several methods to choose from, and all will perform an adequate job.
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Attaching and Detaching Databases
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As previously mentioned, there are ways to back up database files while they re offline and not being used. You can detach a database from a server without deleting the actual files on which the database resides. This might be useful, for example, if you simply want to move a data file between servers without performing backup and restoration operations. Let s look at the process in detail. The first step is to detach a database. This can be performed with the sp_detach_db stored procedure, as in the following example:
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Execute sp_detach_db 'Employees'
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After you execute this command, the database and transaction log file(s) remain intact, but they are inaccessible to the system and to users. You will not see the name of the database within Enterprise Manager or within the system tables. You can now move or rename the data files to another location on the same machine or to another SQL Server 7 installation. After you move or rename the files, you can reattach them by using the sp_attach_db command. Information about the data files does not exist on the server, so you must specify the physical location of the files. For example, the following command will automatically reattach the transaction log file(s) associated with the database used in the preceding example:
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Execute sp_attach_db 'Employees', 'c:\mssql7\data\Emp_data.mdf'
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Note that if a database uses multiple files, you can choose to attach or detach one or more of them within the same command. However, if you remove only some of the data files, you might not be able to access all the objects that are part of the database. Table 7-4 provides a summary of the commands and syntax for attaching and detaching databases.
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An installation of SQL Server 7 assumes the name of the machine onto which it is installed. For example, if my computer is named WORKSTATION1, the name of the SQL Server installation is also WORKSTATION1. So, what happens when the computer name is changed SQL Server 7 does not automatically update its internal settings to reflect the change, and you will receive an error message on startup stating that the SQL Server installation is corrupt. Although the error message might be alarming, you should know that your information is safe. The only problem is that the SQL Server services cannot au-
7:
Recovering the Data
Procedure sp_attach_db
Function Attaches the data files of a database to a server; transaction log files are reattached automatically. Detaches database and transaction log data files from SQL Server; the skipchecks option instructs SQL Server not to update the statistics for the database.
Syntax sp_attach_db [@dbname =] dbname , [@filename1 =] filename_n [,...16]
sp_detach_db
sp_detach_db [@dbname =] dbname [, [@skipchecks =] skipchecks ]
Table 7-4.
Stored Procedures for Attaching and Detaching Databases (continued)
tomatically start. Of course, the easiest way to fix the problem is to change the name of the machine back to its original value.
CAUTION: Changing the name of a SQL Server machine should be done with care, because various tools, scripts, applications, and Enterprise Manager itself might depend on the name of this server to perform specific operations. When the name changes, these settings must be updated, as well.
Two steps are required to update SQL Server 7 s settings: 1. Rerun the Setup program, but do not choose any changes in the installed options. Setup will ask you if you want to refresh the current installation. Choosing to perform this action will update the internal references to the machine name. 2. Drop the old server name and add the new one by using the following commands: sp_dropserver <oldmachinename> Go sp_addserver <newmachinename>, local
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