7. The method according to claim 6 , wherein after determining whether the reduction subgraph changes, the method further comprises: storing the start query node in the query node and the start graph node into the storage space again, and adjusting a value of the dynamic reduction parameter to a second preset value when the reduction subgraph changes; and performing step C.
7. The method according to claim 6 , wherein after determining whether the reduction subgraph changes, the method further comprises: storing the start query node in the query node and the start graph node into the storage space again, and adjusting a value of the dynamic reduction parameter to a second preset value when the reduction subgraph changes; and performing step C. 8. The method according to claim 7 , further comprising ending the filtering out process in order to obtain the reduction subgraph when the resource occupied by the reduction subgraph exceeds the preset available resource condition.