What is SQL filegroup?

What is difference between file and filegroup 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 do I find the filegroup in SQL Server?

How to check SQL Server Filegroup file sizes1SELECT sdf. name AS [File_Name],2sdf. size /128 AS [Size_MB],3fg. name AS [FileGroup_Name],4sdf.physical_name as [File_physical_name]5FROM sys.database_files sdf.6INNER JOIN.7sys.filegroups fg.8ON sdf.data_space_id=fg.data_space_id.How to check SQL Server Filegroup file sizes

What is filegroup backup in SQL Server?

Overview. In addition to doing "File" backups you can also do "Filegroup" backups which allows you to backup all files that are in a particular filegroup. By default each database has a PRIMARY filegroup which is tied to the one data file that is created.

What is SQL Server log file?

Every SQL Server database has a transaction log that records all transactions and the database modifications made by each transaction. The transaction log is a critical component of the database. If there is a system failure, you will need that log to bring your database back to a consistent state.