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What are Filegroups in SQL Server?

Contents
  1. What are Filegroups in SQL?
  2. What is the difference between files and filegroups in SQL Server?
  3. How many types of filegroups are there in SQL Server?
  4. What are MDF and NDF files in SQL Server?
Filegroups are the physical files on your disc volumes that hold SQL Server's data and can be used for backup and administrative management purposes. The first thing to know are what types of files SQL Server uses: Primary Data Files. Secondary Data Files. Log Files. 17 янв. 2017 г.


What are Filegroups in SQL?

FilegroupsThe filegroup contains the primary data file and any secondary files that aren't put into other filegroups.User-defined filegroups can be created to group data files together for administrative, data allocation, and placement purposes.Database Files and Filegroups - SQL Server | Microsoft Docs

What is the difference between files and filegroups in SQL Server?

tl;dr; Filegroups are a logical construct used to separate tables and indexes from each other, files are the physical construct used to store information (log & data) about the database.

How many types of filegroups are there in SQL Server?

There are two types of SQL Server filegroups: primary and user-defined.

What are MDF and NDF files in SQL Server?

A Microsoft SQL database consists a primary data file (mdf) a secondary data file (ndf) and a transaction log file (ldf). For this article, we will concern ourselves with the mdf and ldf files. MDF stands for Main Database File and contains all the information in a database.

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