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Microsoft SQL Server 2008 Internals
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Although a database isn t the same thing as an operating system le, it always exists in two or more such les. These les are known as SQL Server database les and are speci ed either at the time the database is created, using the CREATE DATABASE command, or afterward, using the ALTER DATABASE command.
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System Databases
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A new SQL Server 2008 installation always includes four databases: master, model, tempdb, and msdb. It also contains a fth, hidden database that you never see using any of the normal SQL commands that list all your databases. This database is referred to as the resource database, but its actual name is mssqlsystemresource.
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The master database is composed of system tables that keep track of the server installation as a whole and all other databases that are subsequently created. Although every database has a set of system catalogs that maintain information about objects that the database contains, the master database has system catalogs that keep information about disk space, le allocations and usage, system-wide con guration settings, endpoints, login accounts, databases on the current instance, and the existence of other servers running SQL Server (for distributed operations). The master database is critical to your system, so always keep a current backup copy of it. Operations such as creating another database, changing con guration values, and modifying login accounts all make modi cations to master, so you should always back up master after performing such actions.
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The model database is simply a template database. Every time you create a new database, SQL Server makes a copy of model to form the basis of the new database. If you d like every new database to start out with certain objects or permissions, you can put them in model, and all new databases inherit them. You can also change most properties of the model database by using the ALTER DATABASE command, and those property values then are used by any new database you create.
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The tempdb database is used as a workspace. It is unique among SQL Server databases because it s re-created not recovered every time SQL Server is restarted. It s used for temporary tables explicitly created by users, for worktables that hold intermediate results created internally by SQL Server during query processing and sorting, for maintaining row versions used in snapshot
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3
Databases and Database Files
isolation and certain other operations, and for materializing static cursors and the keys of keyset cursors. Because the tempdb database is re-created, any objects or permissions that you create in the database are lost the next time you start your SQL Server instance. An alternative is to create the object in the model database, from which tempdb is copied. (Keep in mind that any objects that you create in the model database also are added to any new databases you create subsequently. If you want objects to exist only in tempdb, you can create a startup stored procedure that creates the objects every time your SQL Server instance starts.) The tempdb database sizing and con guration is critical for optimal functioning and performance of SQL Server, so I ll discuss tempdb in more detail in its own section later in this chapter.
The Resource Database
As mentioned, the mssqlsystemresource database is a hidden database and is usually referred to as the resource database. Executable system objects, such as system stored procedures and functions, are stored here. Microsoft created this database to allow very fast and safe upgrades. If no one can get to this database, no one can change it, and you can upgrade to a new service pack that introduces new system objects by simply replacing the resource database with a new one. Keep in mind that you can t see this database using any of the normal means for viewing databases, such as selecting from sys.databases or executing sp_helpdb. It also won t show up in the system databases tree in the Object Explorer pane of SQL Server Management Studio, and it does not appear in the drop-down list of databases accessible from your query windows. However, this database still needs disk space. You can see the les in your default binn directory by using Microsoft Windows Explorer. My data directory is at C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\ MSSQL\Binn; I can see a le called mssqlsystemresource.mdf, which is 60.2 MB in size, and mssqlsystemresource.ldf, which is 0.5 MB. The created and modi ed date for both of these les is the date that the code for the current build was frozen. It should be the same date that you see when you run SELECT @@version. For SQL Server 2008, the RTM build, this is 10.0.1600.22. If you have a burning need to see the contents of mssqlsystemresource, a couple of methods are available. The easiest, if you just want to see what s there, is to stop SQL Server, make copies of the two les for the resource database, restart SQL Server, and then attach the copied les to create a database with a new name. You can do this by using Object Explorer in Management Studio or by using the CREATE DATABASE FOR ATTACH syntax to create a clone database, as shown here:
CREATE DATABASE resource_COPY ON (NAME = data, FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\binn \mssqlsystemresource_COPY.mdf'), (NAME = log, FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\binn\mssqlsystemresource_COPY.ldf') FOR ATTACH;
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