According to various aspects of the present disclosure, methods, systems, and media for data migration are provided. In some embodiments, the systems may include: at least one computer-readable storage medium including a set of instructions for migrating data records; and at least one processor in communication with the computer-readable storage medium, wherein when executing the set of instructions, the at least one processor is directed to: query data in a data storage system comprising a plurality of slave nodes; determine, from a plurality of data records in the slave nodes, at least one candidate data record that satisfies a first condition; identify, from the slave nodes, at least one candidate slave node that satisfies a second condition; and in response to determining that the number of the at least one candidate slave node is not less than a threshold value, migrate the candidate data record to a target slave node.