Research on method of distributed query optimization based on equivalent transformation
Chen Lai-jie · Jisuanji gongcheng yu sheji · 2006
Query rule of distributed database,expense estimate and hierarchy of distributed query was analyzed.And distributed query could transfer relational algebra expression by using consistency of relational operation and SQL description,and realize query optimi-zation by equivalent transformation of relational algebra expression.Finally,the method of query optimization of distributed query op-timization based on equivalent transformation was proved to be feasible with an example.