APPLIES TO: YesSQL Server YesAzure SQL Database NoAzure Synapse Analytics (SQL DW) NoParallel Data Warehouse

A database in SQL Server is made up of a collection of tables that stores a specific set of structured data. A table contains a collection of rows, also referred to as records or tuples, and columns, also referred to as attributes. Each column in the table is designed to store a certain type of information, for example, dates, names, dollar amounts, and numbers.

Basic Information about Databases

A computer can have one or more than one instance of SQL Server installed. Each instance of SQL Server can contain one or many databases. Within a database, there are one or many object ownership groups called schemas. Within each schema there are database objects such as tables, views, and stored procedures. Some objects such as certificates and asymmetric keys are contained within the database, but are not contained within a schema. For more information about creating tables, see Tables.

SQL Server databases are stored in the file system in files. Files can be grouped into filegroups. For more information about files and filegroups, see Database Files and Filegroups.

When people gain access to an instance of SQL Server they are identified as a login. When people gain access to a database they are identified as a database user. A database user can be based on a login. If contained databases are enabled, a database user can be created that is not based on a login. For more information about users, see CREATE USER (Transact-SQL).

A user that has access to a database can be given permission to access the objects in the database. Though permissions can be granted to individual users, we recommend creating database roles, adding the database users to the roles, and then grant access permission to the roles. Granting permissions to roles instead of users makes it easier to keep permissions consistent and understandable as the number of users grow and continually change. For more information about roles permissions, see CREATE ROLE (Transact-SQL) and Principals (Database Engine).

Working with Databases

Most people who work with databases use the SQL Server Management Studio tool. The Management Studio tool has a graphical user interface for creating databases and the objects in the databases. Management Studio also has a query editor for interacting with databases by writing Transact-SQL statements. Management Studio can be installed from the SQL Server installation disk, or downloaded from MSDN. For more information about SQL Server Management Studio tool, see SQL Server Management Studio (SSMS).

In This Section

System Databases Delete Data or Log Files from a Database
Contained Databases Display Data and Log Space Information for a Database
SQL Server Data Files in Microsoft Azure Increase the Size of a Database
Database Files and Filegroups Rename a Database
Database States Set a Database to Single-user Mode
File States Shrink a Database
Estimate the Size of a Database Shrink a File
Copy Databases to Other Servers View or Change the Properties of a Database
Database Detach and Attach (SQL Server) View a List of Databases on an Instance of SQL Server
Add Data or Log Files to a Database View or Change the Compatibility Level of a Database
Change the Configuration Settings for a Database Use the Maintenance Plan Wizard
Create a Database Create a User-Defined Data Type Alias
Delete a Database Database Snapshots (SQL Server)



Stored Procedures (Database Engine)