Data processing method, device and system

The invention discloses a data processing method, device and system. The method comprises the steps that an operation log, binary log, of a MySQL database main server is acquired, all operation commands of the MySQL database main server are recorded in the binary log, the binary log is further analyzed, and command data of multiple operation types are obtained; then the obtained command data of multiple operation types are stored in a client side so that the command data of the requested operation types can be sent to a terminal when the client side receives a data request sent by the terminal, and the terminal can complete corresponding data operation. Due to the fact that it is only needed to acquire the operation log from the main server, the performance of the main server cannot be influenced.