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    STUDIA INFORMATICA - Issue no. 1 / 2004  
         
  Article:   STOCHASTIC OPTIMIZATION OF QUERYING DISTRIBUTED DATABASES III. EVOLUTIONARY METHOD VERSUS CONSTRUCTIVE METHOD.

Authors:  D. DUMITRESCU, V. VARGA.
 
       
         
  Abstract:  The stochastic query optimization problem for multiple join - join of p relations, stored at p different sites - leads to a special nonlinear programming problem. General optimization problem can be solved by using evolutionary methods. The problem of four joins is a particular case of the general query optimization problem. This particular problem is solved applying the Constructive Algorithm from Part II and the Adaptive Representation Evolutionary Algorithm. The results obtained by applying these two methods are compared. Two sets of constant values are used in this comparison.  
         
     
         
         
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