6Steinbrunn M, Moerkotte G, Kemper A. Heuristic and Randomized Optimization for the Join Ordering Problem[ J ]. The VLDB Journal, 1997, 6(3) :8 - 17.
7Metropohs N, Rosenbluth A. Rosenbluth Metal, Equation of state calculations by fast computing machines [ J ]. Journal of Chemical Physics, 1953,56 (21) : 1087 - 1092.
8Kirkpatrick S, Jr Gelatt C D, Vecchi M P. Optimization by simulated annealing[ J ]. Science, 1983,220 ( 11 ) : 650 - 671.
