Concurrency Control Strategy Distinguishing Real-time Transaction Criticality

In mobile real-time database system,the criticality in real-time transaction is on behalf of the urgency of the time.Due to the urgency of realtime transaction in varying degrees,in order to ensure the time accuracy of the transaction,it is necessary to distinguish criticality of transaction and propose corresponding concurrency control strategy.tuY the real-time transaction which is divided into software and hardware transaction by the importance of meeting the deadline.Based on this,propose three priority concurrency control strategies to distinguish the criticality of transaction,compare the performance of three strategies and propose improved method.The results show that classifying real-time transaction is in favor of the designing strategy in transaction priority assignment and scheduling.