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This article will explain in detail what the role of the SqlServer system database is, the content of the article is of high quality, so the editor will share it with you for reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

The Master Master database holds all the databases placed on the SQLSERVER entity, and it is also the glue that holds the engine together. Since SQLSERVER cannot be started without using the master database, you have to manage the database carefully. Therefore, it is necessary to make a regular backup of this database. This database includes information such as system login, configuration settings, connected SERVER, and general information about other systems and user databases used for the entity. The main database also has extended stored procedures that can access external processes, allowing you to interact with features such as disk subsystems and system API calls. These processes are generally done in modern programming languages like C++. If you unfortunately encounter a system crash and have to restore the master database, you can refer to the article published by MCSE/MCDBA Steven Warren on TechRepublic. This article is very thorough and explains some of the special steps required to restore this important database. Model Model is a template database used to create a new user database on an entity. You can put any stored procedures, views, users, etc., in the model database, so that when you create a new database, the new database will contain all the objects you put in the model database. Tempdb, as its name suggests, tempdb holds temporary objects, such as global and local temporary tables and stored procedures. The database is recreated each time SQLSERVER is restarted, and the objects it contains are created based on the objects defined in the model database. In addition to these objects, tempdb has other objects, such as table variables, result sets from table-valued functions, and temporary table variables. Because tempdb retains these object types for all databases on the SQLSERVER entity, it is important to optimize the configuration of the database. In SQL Server 2005, the tempdb database has an additional task; it is also used as a version library for features such as the new snapshot isolation layer and online index operations. For a brief description of the new isolation layer, please refer to my article on SQL Server 2005 advanced features. Distribution when your SQLSERVER entity is configured to copy and distribute SERVER, the database will be added to your system. By default, the name of the database is distribution, but you can change its name. This database is used to hold history and metadata for snapshots, merges, transactional replication, and so on. Msdb Msdb databases are used to store database backups, SQL Agent information, DTS packages, SQLSERVER tasks, and replication information such as log transfers.

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