This paper describes a study of the performance of secure concurrency control schemes in Multilevel-Secure Database Management Systems(MLS/DBMSs). The secure concurrency control schemes are free from covert channels due to contention for access to the shared objects. A scheme-independent simulation model has been developed in order to support comparative studies of various secure concurrency control schemes. This paper describes the model in detail and presents performance results which were obtained for what it believe to be a representative cross-section of the many proposed secure concurrency control schemes.
Using simulation, this paper compares and evaluates the performance of the Multiversion Orderstamp Ordering(MVO2) scheme and Optimistic Orange Locking(OOL) scheme. This paper finds that in every system and application parameters this paper has simulated that the MVO2 scheme performs only marginally better than the OOL scheme. In addition, This paper finds that OOL scheme outperforms the MVO2 scheme when the contention for access to object is low. However, MVO2 scheme outperforms the OOL scheme when the system is rich in resources.
