LessThanDot - SQL Server Filegroups: The What, The Why and ...
https://blogs.lessthandot.com/index.php/DataMgmt/DBAdmin/sql-server-filegroups-the-what
What is a Filegroup? A filegroup is a logical structure to group objects in a database. Don’t confuse filegroups with actual files (.mdf, .ddf, .ndf, .ldf, etc.). You can have multiple filegroups per database. One filegroup will be the primary, and all system tables are stored on it. Then, you add additional filegroups.
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