Description: MARIADB_PID_FILE is an environment variable that specifies the PID file for the MariaDB server. The PID file (Process ID) is a file that contains the unique identifier of the running database server process. This identifier is crucial for process management, as it allows administrators and operating systems to track the server’s status, as well as facilitate operations such as starting, stopping, and monitoring it. The MARIADB_PID_FILE variable allows users to define the location and name of the PID file, which can be useful in environments where custom configuration is required or where multiple instances of MariaDB are running. By setting this variable, administrators can avoid file conflicts and ensure that each MariaDB instance has its own PID file, improving organization and resource management. In summary, MARIADB_PID_FILE is an essential tool for the efficient administration of database servers, providing more granular control over running processes.