After system restarted, mariadb failed to startup.

Issue

• After system restarted, mariadb service failed to start up. But then the mariadb service can be started manually normally.

• We can verify error messages as below:

#sudo systemctl status mariadb
● mariadb.service - MariaDB database server
   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/mariadb.service.d
           mqoverride.conf
   Active: failed (Result: exit-code) since 木 2023-11-16 12:13:35 JST; 55min ago
  Process: 1154 ExecStartPre=/usr/libexec/mariadb-prepare-db-dir %n (code=exited, status=1/FAILURE)

11月 16 12:13:35 localhost systemd[1]: Starting MariaDB database server...
11月 16 12:13:35 localhost mariadb-prepare-db-dir[1154]: Database MariaDB is not initialized, but the directory /DB/mysql-5.5.60-MariaDB ... done.
11月 16 12:13:35 localhost mariadb-prepare-db-dir[1154]: Make sure the /DB/mysql-5.5.60-MariaDB is empty before running mariadb-prepare-db-dir.
11月 16 12:13:35 localhost systemd[1]: mariadb.service: control process exited, code=exited status=1
11月 16 12:13:35 localhost systemd[1]: Failed to start MariaDB database server.
11月 16 12:13:35 localhost systemd[1]: Unit mariadb.service entered failed state.
11月 16 12:13:35 localhost systemd[1]: mariadb.service failed.