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CHAPTER 3 EXPLORING, CREATING, AND RECOVERING DATABASES
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Figure 3-13. You can copy a file created in the normal way with an autoclose database option value of 1. The next segment of the script shows the syntax for detaching the Database_2 database. This statement is not strictly necessary because the file is not attached in the first place. You only require sp_detach_db when a file is explicitly attached to a server, which is not normally the case for SSE databases. Detaching a database makes it unavailable to a server instance (almost as if you dropped the database). Unlike a DROP DATABASE statement, a sp_detach_db statement does not remove the files associated with a database. The following script excerpt confirms the existence of the database files for Database_2 with a dir command. EXEC sp_detach_db @dbname = N'Database_2' GO SELECT name FROM sys.databases WHERE name = 'Database_2' DECLARE @str1 nvarchar(90) SET @str1 = 'dir ' + 'c:\prosseapps\chapter03\database_2*.*' EXEC master..xp_cmdshell @str1 GO Figure 3-14 shows the result sets from running the segment. Notice the first result set is empty. This is because there is no database on the server instance named Database_2 after the execution of the sp_detach_db statement. You should also note the output from the dir command for the two database files.
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Figure 3-14. Even after you detach a database, its files are still available for use.
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CHAPTER 3 EXPLORING, CREATING, AND RECOVERING DATABASES
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The final segment from SQLQuery7_f0313_f0314_f0315.sql attaches the files left after the execution of the sp_detach_db statement. By using a CREATE DATABASE statement with a FOR ATTACH clause, we can re-create a new version of the Database_2 database. The new version has an autoclose database option value of TRUE. However, you cannot copy its database files. The following script demonstrates these features. Contrast this performance with the initial version of Database_2, which did allow access to its files.
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If you need to copy files for an attached database, you can accomplish the task in three steps. First, detach the database. Second, copy its files. Third, reattach the database files to a server instance.
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CREATE DATABASE Database_2 ON PRIMARY (FILENAME = 'c:\prosseapps\chapter03\Database_2dat.mdf') LOG ON (FILENAME = 'c:\prosseapps\chapter03\Database_2log.ldf') FOR ATTACH GO SELECT name, database_id, is_auto_close_on FROM sys.databases WHERE name = 'Database_2' GO DECLARE @str1 nvarchar(90) SET @str1 = 'copy c:\prosseapps\chapter03\database_2dat.mdf ' + 'c:\prosseapps\chapter03\database_2dat.bak' EXEC master..xp_cmdshell @str1 GO Figure 3-15 shows the output from the preceding script excerpt. Two points are especially noteworthy. First, the autoclose database option is set to TRUE. This normally means the files for a database can be copied unless the file is open. Second, when you create a database by attaching database files to a server, the server, even an SSE instance, keeps the database files open all the time. As a result, the database files are in use all the time by the process for the database server, and the database files cannot be copied even when no user is actively using the database.
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Figure 3-15. You can t copy the database files for a database created with a FOR ATTACH clause.
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Backing Up and Restoring Databases
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Although the CREATE DATABASE statement with a FOR ATTACH clause and the sp_detach_db systemstored procedure offer some support for backing up and restoring databases, these techniques are not optimized for backing up and restoring databases. When your primary objective is backing up and restoring your databases, consider using the BACKUP DATABASE and RESTORE DATABASE statements. There are a variety of related statements and concepts that can help you apply BACKUP DATABASE and RESTORE DATABASE statements so that they meet your specific objectives. Recovering databases is an exceedingly rich SQL Server administration topic. This section aims to convey an overview of the topic and provide you with some practical samples that you can
CHAPTER 3 EXPLORING, CREATING, AND RECOVERING DATABASES
readily adapt for your own database backup and recovery solutions. The techniques demonstrated in this section will be sufficient for the database recovery needs of many database developers and small businesses served by an individual database developer. Those of you with advanced database recovery requirements can use this section as a foundation for moving on to more complex techniques, such as the bulk-logged recovery model and the full recovery models that permit the most flexible database restoration to a specific point in time.
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