Which of the Following Is Not a System Database on a SQL Server System?
SQL Server is a relational database management system (RDBMS) developed by Microsoft. It utilizes various databases to store and manage data. Among these databases, there are a few that are considered system databases. The system databases play a crucial role in the functioning of SQL Server, as they provide essential services and store system information. However, one of the following databases is not classified as a system database on a SQL Server system.
The system databases in a SQL Server system include:
1. Master Database: The master database records all system-level information for SQL Server, such as logins, endpoints, and configuration settings.
2. Model Database: The model database acts as a template for all newly created databases. It provides the default settings and objects that are copied when a new database is created.
3. MSDB Database: The MSDB database is used by SQL Server Agent to store job information, alerts, and notifications. It also stores backup and restore history, as well as maintenance plans.
4. TempDB Database: The TempDB database is a temporary workspace for SQL Server. It stores temporary data, tables, and variables used during query processing or other database operations.
5. Resource Database: The Resource database is a read-only database that contains system objects and metadata required by SQL Server. It is used to support the upgrade and patching process.
Out of these databases, the Model Database is not classified as a system database. While it plays a crucial role in the creation of new databases, it does not store system-level information or provide essential services like the other system databases.
FAQs:
1. What happens if one of the system databases becomes corrupted?
If a system database becomes corrupted, it can lead to critical issues with SQL Server. It is recommended to restore the database from a backup or rebuild it using SQL Server setup.
2. Can I move the system databases to a different location?
Yes, you can move the system databases to a different location. However, it requires careful planning and execution to avoid any disruptions to SQL Server.
3. Can I delete a system database?
Deleting a system database is not recommended as it can cause significant issues with SQL Server. It is best to leave the system databases untouched unless advised by Microsoft support.
4. Can I change the name of a system database?
Changing the name of a system database is not supported by SQL Server. It is best to avoid renaming any of the system databases.
5. Can I backup and restore the system databases?
Yes, you can backup and restore the system databases. However, it is important to follow the proper procedures and ensure the backups are regularly taken to avoid data loss.
6. Can I shrink the system databases to free up disk space?
Shrinking the system databases is not recommended as it can lead to fragmentation and performance issues. It is best to manage disk space by regularly monitoring and archiving data.
7. Can I change the collation of a system database?
Changing the collation of a system database is a complex operation and is not recommended unless necessary. It can have significant implications on the functioning of SQL Server and the applications that rely on it.