Supported by the Natural Science Foundation of China(11101130);the Research Fund of the Heilongjiang Provincial Education Department for the Academic Backbone of the Excellent Young People(1254G044);the Science and Technology Innovation Team in Higher Education Institutions of Heilongjiang Province(2014TD005);the Heilongjiang University Science Funds for Distinguished Young Scholars(JCL201303);the Key Laboratory of Database and Parallel Computing,Heilongjiang Province(KLDP-OF-2012-06)