损坏容忍的数据查询降级服务机制

Damage-tolerant Date Query Degraded Service Mechanism

传统的数据库安全机制重点关注数据的机密性,忽略了用户对数据库系统提供数据的完整性和可用性要求。为了提高系统数据的可用性和用户查询服务的满意度,提出了一种损坏容忍的数据查询降级服务机制。首先,在现有可生存性研究的基础上,引入降级服务的数据模型、数据完整度等相关概念,给出查询降级服务模型的定义;其次,根据该降级服务模型的定义给出相关的查询处理机制与具体查询算法,并从理论上证明该机制的正确性;最后,通过实验从查询执行性能的角度进一步说明该查询降级服务机制的有效性。

Traditional database security mechanism which focuses on the data confidentiality often overlooks the re- quirementd of data integrity and availability. This paper presented a Damage-Tolerant Data Query Degraded Service o（DT-DQDS） ,for improving system availability and user satisfaction of query operation. First, the model of the degraded servi-ce was given, which includes the definitions of data model and data integrity concept based on the existing study of survivability. Second, according to DT-DQDS model, data query mechanism and a concrete query algorithm were provid- ed, and the mechanism is validated theoretically. Finally, experimental results further demonstrate its good perfor-mance on the aspect of query execution efficiency.