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SQL Server series: database composition and System database

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1. Database composition

The storage structure of the database is divided into logical storage structure and physical storage structure.

◊ Logical Storage structure: A description of the nature of the database is composed of information. SQL Server's database is more than just storage of data, and all information related to data processing operations is stored in the database.

◊ Physical storage structure: the database is stored on disk in files, consisting of database files and transaction log files, and a database should contain at least one database file and one transaction log file.

The database files in the SQL Server database system are composed of data files and log files, and the data files are stored in storage in extents.

1.1> Data files

SQL Server series: database composition and System database

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