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    STUDIA INFORMATICA - Issue no. 1 / 2003  
         
  Article:   STOCHASTIC OPTIMIZATION OF QUERYING DISTRIBUTED DATABASES I. THEORY OF FOUR RELATIONS JOIN.

Authors:  D. DUMITRESCU, V. VARGA. 		 
       
         
  Abstract:  Stochastic query optimization problem for multiple join is ad- dressed. In Part I two sites model of Drenick and Smith (1993) is extended to four relations stored at four different sites. Our model leads to a special kind of nonlinear optimization problem (P). It is proved (Theorem 5.1) that this problem has at least one solution. In Part II an ad hoc constructive model for solving problem (P) is proposed. In Part III a new evolution- ary technique is used for solving problem (P). Results obtained by the two considered optimization approaches are compared.  
         
     
         
         
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