Data copying method and system based on different database

The application discloses a data copying method and system based on different databases; the method and system build a shared memory area with a preset size in advance in an application server memory, and the memory area serves as a data transfer channel (or channel file) between a source database and a target database for data copying; the channel is employed to carry out data transfer between the source database and the target database in a dataflow mode, thus copying data between the source and target databases; the method and system need not to make to-be copied data as local files on the application server, so intermediate data needs not to be localized, thus solving the overloading problems of an application server disk; the method and system use the channel file to copy data, the channel file hardly occupies space, and the dataflow mode is used to transfer the to-be copied data, thus realizing high concurrency massive data copying.