Databases in SQL Server 2012 span at least two, and optionally several, database files. There must always be at least one file for data and one file for the transaction log. These database files are normal operating system files created in a directory within the operating system. These files are created when the database is created or when a database is expanded.
Each database file has the following set of properties:
A logical filename—This name is used for internal reference to the file.
A physical filename—This ...