Db2 s optimizer is the component that accomplishes this physical data independence Db2的优化器是完成该物理数据独立性的组件。
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This separation of access criteria from physical storage characteristics is called physical data independence 从物理存储特征中分离出访问标准叫作物理数据独立性。
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Physical data independence : the capacity to change the internal schema without having to change the conceptual schema 逻辑资料独立：不必改变外部纲要或应用程式，即可改变概念纲要的能力。
