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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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5. Once the process has been killed, you can close the Activity Monitor, which takes you back to the Detach Database dialog box. If the dialog box hasn t automatically updated, then click the Refresh button, which should then allow you to see no error messages. You can then click OK to finish detaching the database. That s it. The database is detached, is no longer part of SQL Server, and is ready to be removed or even deleted. If you check the Object Explorer in SQL Server Management Studio, you will see that the database is no longer listed. Detaching a database, although seemingly a simple and innocuous operation, has the potential to be fraught with problems and worries. As the example demonstrated, ensuring that there are no users attached to the database at the time of detaching is not as easy as it first may seem. Setting up the database options to eliminate connections or to stop updates is only possible once everyone has been removed from connections to the database. There is no easy way of removing connections safely, as you never know what an application with a connection to the database is doing. You could remove a connection that is in the middle of processing. If you are going down the route of detaching the server, though, there is an obvious reason to do this, such as moving servers, removing the database, and therefore you would have a plan of action to do this. Users would have been notified days or weeks in advance, and the database owner would have coordinated a date and time when nobody should be connected. Also, the database owner would be around if there were any problems, and he or she could make the decision to kill any connections left hanging around. Detaching the database is a process that removes entries within the SQL Server system tables to inform SQL Server that this database is no longer within this instance of SQL Server and therefore cannot be used. It is as simple as that. If you are removing the database completely, then you will need to delete the files from the directory they were created in. It is possible to detach the database using a system stored procedure, although this does not let you kill the connections. This has to be done via a T-SQL command. We need to reattach the database before being able to demonstrate this, so let s do that now. This would occur on our new SQL Server instances after physically moving the files.
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Try It Out: Attaching a Database
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1. Within Object Explorer, highlight the Databases node, right-click, and select Attach. 2. This brings up the Attach Databases dialog box, shown in Figure 7-13. To add a database, click Add. 3. This brings up the Locate Database Files Explorer, shown in Figure 7-14. You can use this like other Windows Explorers to locate where your database MDF files are. Once you find the database you want to reattach, highlight it and then click OK.
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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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Figure 7-13. Options for attaching a database
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Figure 7-14. Locating the database to attach
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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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4. This will bring you back to the Attach Databases dialog box with the details filled in, as you see in Figure 7-15. Take a moment to look over the information in this dialog box. Any problems will be detailed in the Messages column. It is possible to attach more than one database, but it is best to do databases one at a time.
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Figure 7-15. Database located, preparing to attach 5. This then leaves us to click OK to reattach the database. Moving to Object Explorer, you should see your database at the bottom of the list, where it will remain until the explorer is refreshed. Attaching a database involves informing SQL Server of the name and the location of the data files and the transaction log files. This data can be placed anywhere on a computer, but it is recommended you place the data in a sensible location. For example, the folders tempfiles or tobedeleted sport extreme names, but do demonstrate the unsuitability that should be avoided. When moving the data from one physical server to another, the data does not need to be in a subdirectory of Microsoft SQL Server installation found under Program Files. In fact, in production environments, this is the last place you would locate the data. You would generally want to keep these files away from any program files or the pagefile.sys file, because SQL Server s performance can be maximized when these files are separated. However, for the purpose of this book, placing the data in the DATA directory under the instance of SQL Server is perfectly valid and acceptable. Once the two data files have been copied, it is a simple process of using a couple of mouse clicks to attach these files into the instance. What happens in the background, very basically, is that SQL Server takes the name of the database and the location of the data files and places them into internal tables that are used to store information about databases. It then scans the data files to retrieve information, such as the names of the tables, to populate the system tables where necessary.
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