三，Design Demands of Database Data Independence o Reducing redundancy ●Interface Reliability,Security, Integrity Reorganization of database ●Open-ended ability ●恢复问题 1212 三，Design Demands of Database ⚫ Data Independence ⚫ Reducing redundancy ⚫ Interface ⚫ Reliability, Security, Integrity ⚫ Reorganization of database ⚫ Open-ended ability ⚫ 恢复问题