Databases - SQL Server | Microsoft Docs
docs.microsoft.com › en-us › sqlApr 01, 2022 · 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.