The .frm file in MySQL refers to the file that stores the table definition and structure. It is based on the table name and corresponds to each MySQL table. It contains metadata information of the table, including column names, data types, Indexes, constraints, etc., when the database starts, MySQL will read the information of the .frm file to restore the structure of the table, and use this information to perform operations such as data query, insertion, update, and deletion.
Operating system for this tutorial: Windows 10 system, MySQL 8 version, Dell G3 computer.
The .frm file in MySQL refers to the file that stores the table definition and structure. It is based on the table name and corresponds to each MySQL table. The .frm file contains metadata information of the table, including column names, data types, indexes, constraints, etc.
.frm file is one of the key files used by the MySQL database engine to identify and read the table structure. When the database starts, MySQL will read the information in the .frm file to restore the table structure, and use this information to perform operations such as data query, insertion, update, and deletion.
It is important to note that the .frm file only contains the structure definition of the table and does not contain the actual data. The actual data is stored in other files used by the storage engine, such as .ibd files (InnoDB storage engine) or .MYD and .MYI files (MyISAM storage engine).
In a MySQL database, if the .frm file is missing or damaged, the structure of the table cannot be read correctly. Therefore, it is very important to protect the .frm file and ensure data security by regularly backing up the database.
It should be noted that when performing database migration, backup recovery or cross-version upgrade, the compatibility of .frm files also needs to be considered. Different versions of MySQL may have changes in the structure definition of the .frm file, so you need to ensure that you use the same or compatible MySQL version to use the .frm file.
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