varlibmysql

varlibmysql is a directory commonly found on Linux-based systems that host a MySQL or MariaDB database server. This directory serves as the primary location for the database's data files, also known as the data directory or datadir. The specific contents of varlibmysql are crucial for the operation of the database, housing all the tables, indexes, stored procedures, and other database objects.

Within varlibmysql, individual subdirectories typically represent different databases managed by the MySQL instance. Each of these database subdirectories contains files that correspond to the tables within that database. These files often have extensions like .frm for table structure, .ibd for InnoDB data and indexes, and .MYD/.MYI for MyISAM data and indexes respectively. The exact file structure can vary depending on the storage engine used by MySQL.

It is important to note that direct manipulation of files within varlibmysql is strongly discouraged. Modifications should always be performed through the MySQL client or administrative tools to prevent data corruption. The permissions and ownership of the varlibmysql directory are also critical and are typically set to allow the MySQL server process to read and write to it, while restricting access for other users. Backups of the varlibmysql directory are essential for disaster recovery and should be performed regularly using database-specific backup tools or methods.