For more information about attaching databases and information about changes that are made to metadata when you attach a database, see Database Detach and Attach (SQL Server). Before you use a database from an unknown or untrusted source, run DBCC CHECKDB on the database on a nonproduction server and also examine the code, such as stored procedures or other user-defined code, in the database. Such databases could contain malicious code that might execute unintended Transact-SQL code or cause errors by modifying the schema or the physical database structure. We recommend that you do not attach or restore databases from unknown or untrusted sources. For information about file permissions that are set whenever a database is detached and attached, see Securing Data and Log Files from SQL Server 2008 R2 Books Online (Still a valid read!) Securityįile access permissions are set during a number of database operations, including detaching or attaching a database. There are no transaction log backups, and it's possible to accidentally delete files. We don't recommend using detach and attach for Backup and Recovery. For more information, see Move User Databases. We recommend that you move databases by using the ALTER DATABASE planned relocation procedure instead of using detach and attach, when moving database files within the same instance. When you attach a database, if MDF and LDF files are located in different directories and one of the paths includes \\?\GlobalRoot, the operation will fail. If any data file has a different path from when the database was first created or last attached, you must specify the current path of the file. When you attach a database, all data files (MDF and LDF files) must be available. For more information, see Detach a Database. Attempting to attach a database that has not been detached will return an error. You can use this feature to copy, move, or upgrade a SQL Server database.
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This topic describes how to attach a database in SQL Server by using SQL Server Management Studio or Transact-SQL. Applies to: SQL Server (all supported versions)