However, in order to optimize the query operation, Some Database middleware such as MOCHA ship part of codes to the distant sites which are close by the database.

• 然而,某种数据库中间件(如:MOCHA)为了减少网络数据传输量,实现查询优化,就把部分代码类迁移到近数据库站点进行数据缩减运算。