A database expansion system, equipment, and a method of expanding a database. The method includes: receiving modification information instructing to modify a mapping relationship between a virtual database and a database; reconfiguring according to the modification information the mapping relationship; receiving a database access request and analyzing the database access request to obtain information about a target virtual database; acquiring, according to the reconfigured mapping relationship, target database related information corresponding to the target virtual database; transmitting to a target database the database access request; and acquiring from the target database data corresponding to the database access request. The database expansion system, the equipment, and the method of expanding the database implement flexible capacity expansion of a database by mapping a virtual database to an expanded database, reducing an expansion cost, and maximally utilizing resources of a database server.