By: Ashish Kumar Mehta | Last Updated: 2009-12-02 | Comments (21) | DBA Best Practices
One of the Junior SQL Server Database Administrator in my company approached me yesterday with a dilemma. He was assigned a task to rename few of the databases in Beta and Production environments; the reason being the database name was based on some other project that is no longer relevant to the data which is presently stored within the database. At first I started to tell him, but figured it would be smarter to document the same and share the information.
Database Administrators usually use the sp_renamedb system stored procedure to quickly rename a SQL Server Database. However, the drawback of using sp_renamedb is that it doesn't rename the Logical and Physical names of the underlying database files.
It's a best practice to make sure the Logical Name and Physical File Name of the database is also renamed to reflect the actual name of the database to avoid any confusion with backup, restore or detach/attach operations.
In this tip, you will see the steps which you need to follow to rename a SQL Server Database using the ALTER DATABASE command.
Creating a Sample Database Namely CoreDB
Let's first create a new database named CoreDB using the T-SQL below:
USE master GO IF EXISTS (SELECT name FROM sys.databases WHERE name = N'CoreDB') DROP DATABASE CoreDB GO USE master GO CREATE DATABASE [CoreDB] ON PRIMARY ( NAME = N'CoreDB', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\CoreDB.mdf' , SIZE = 2048KB , FILEGROWTH = 1024KB ) LOG ON ( NAME = N'CoreDB_log', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\CoreDB_log.ldf' , SIZE = 1024KB , FILEGROWTH = 10% ) GO
Rename CoreDB Database Using sp_renamedb System Stored Procedure
Now let's rename the CoreDB database to ProductsDB by executing the below T-SQL code.
USE master GO ALTER DATABASE CoreDB SET SINGLE_USER WITH ROLLBACK IMMEDIATE GO EXEC master..sp_renamedb 'CoreDB','ProductsDB' GO ALTER DATABASE ProductsDB SET MULTI_USER GO
Once the above T-SQL has executed successfully the database name will change however the Logical Name and File Name will not change. You can verify this by executing the T-SQL below:
USE master GO
/* Identify Database File Names */ SELECT name AS [Logical Name], physical_name AS [DB File Path], type_desc AS [File Type], state_desc AS [State] FROM sys.master_files WHERE database_id = DB_ID(N'ProductsDB') GO
Your output should look something like this from the above query.
You can see in the above snippet that the Logical Name and File Name in the DB File Path column for ProductsDB are still reflecting the old name of CoreDB. This is not a good practice to follow in a Production Environment. Below you will see the steps which a DBA can follow to rename the database and its respective files.
Steps to Rename a SQL Server Database
DBAs should follow the below steps which will not only rename the database, but at the same time will also rename the Logical Name and File Name of the database.
This first set of commands put the database in single user mode and also modifies the logical names.
/* Set Database as a Single User */ ALTER DATABASE CoreDB SET SINGLE_USER WITH ROLLBACK IMMEDIATE /* Change Logical File Name */ ALTER DATABASE [CoreDB] MODIFY FILE (NAME=N'CoreDB', NEWNAME=N'ProductsDB') GO ALTER DATABASE [CoreDB] MODIFY FILE (NAME=N'CoreDB_log', NEWNAME=N'ProductsDB_log') GO
This is the output from the above code.
Now we need to detach the database, so we can rename the physical files. If the database files are open you will not be able to rename the files.
/* Detach Current Database */ USE [master] GO EXEC master.dbo.sp_detach_db @dbname = N'CoreDB' GO
Once the CoreDB database is detached successfully then the next step will be to rename the Physical Files. This can be done either manually or by using the xp_cmdshell system stored procedure. You can enable xp_cmdshell feature using the sp_configure system stored procedure.
USE master GO sp_configure 'show advanced options' GO /* 0 = Disabled , 1 = Enabled */ sp_configure 'xp_cmdshell', 1 GO RECONFIGURE WITH OVERRIDE GO
Once xp_cmdshell is enabled you can use the below script to rename the physical files of the database.
/* Rename Physical Files */ USE [master] GO EXEC xp_cmdshell 'RENAME "C:\Program Files\Microsoft SQL ServerMSSQL10.SQL2008\
MSSQL\DATA\CoreDB.mdf", "ProductsDB.mdf"' GO EXEC xp_cmdshell 'RENAME "C:\Program Files\Microsoft SQL ServerMSSQL10.SQL2008\
MSSQL\DATA\CoreDB_log.ldf", "ProductsDB_log.ldf"' GO
Once the above step has successfully executed then the next step will be to attach the database, this can be done by executing the T-SQL below:
/* Attach Renamed ProductsDB Database Online */ USE [master] GO CREATE DATABASE ProductsDB ON ( FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\ProductsDB.mdf' ), ( FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008\MSSQL\DATA\ProductsDB_log.ldf' ) FOR ATTACH GO
Once the above step has successfully executed then the final step will be to allow multi user access for the user database by executing the below T-SQL:
/* Set Database to Multi User*/ ALTER DATABASE ProductsDB SET MULTI_USER GO
You can verify the Logical and File Names for the ProductsDB database by executing the T-SQL below:
USE master GO /* Identify Database File Names */ SELECT name AS [Logical Name], physical_name AS [DB File Path], type_desc AS [File Type], state_desc AS [State] FROM sys.master_files WHERE database_id = DB_ID(N'ProductsDB') GO
You can see in the above snippet that the Logical Name and File Name for ProductsDB are now correct.
- Once the database name is changed successfully then you need to make sure your application code is referring to the new database name.
- The steps to rename a SQL Server Database mentioned in this tip are applicable for both SQL Server 2005 and SQL Server 2008.
Last Updated: 2009-12-02
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