5. The data query system of claim 4 , 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.
4. The data query system of claim 3 , 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.