Port 3306 is the default port for the MySQL Protocol, which is used by the mysql client, MySQL Connectors, and utilities such as mysqldump and mysqlpump. Port 33060 is the default port for the MySQL Database Extended Interface (the MySQL X Protocol).

出处：https://dev.mysql.com/doc/mysql-port-reference/en/mysql-ports-reference-tables.html#mysql-client-server-ports