7. The data query system of claim 6 , wherein, the load balance controller is configured to send the starting instruction to the query component in the following way: sending the starting instruction to the query component according to a received control command of a user, or the load balance controller is further configured to set a starting threshold according to a running index of the data query system; and the load balance controller is configured to send the starting instruction to the query component in the following way: the load balance controller monitoring a running state of the data query system, and sending the starting instruction to the query component if the running index of the data query system reaches the starting threshold.
8. The data query system of claim 7 , wherein, the running index of the data query system is one or more of a use scale of the data query system, responsiveness to the client request, a number of the client request, an amount of calculation of the client request supported by the system, time consumption and occupied resources of a CPU for processing the request.