移动实时数据库系统多版本数据广播

结合多版本乐观并发控制协议(MVOCC)提出了带失效报告多版本-有效性检查信息 (Multiversion- Validation Information, MV-VI) 广播机制，并给出了多种多版本广播磁盘组织。MV-VI广播机制支持移动主机(MHs)与网络断接。在广播周期中广播事务全局有效性检查信息VI，IR广播后插入多个快速失效报告(Fast Invalidation Report, FIR)，广播快速更新的数据。通过模拟仿真，对MV-IV 广播机制进行了性能测试，实验结果表明，MV-IV 广播机制性能明显好于其它广播机制。

Multiversion Data Broadcast in Mobile Real-time Database Systems

The multiversion-validation information(MV-VI)data broadcast mechanism with invalidation report is proposed that combinesmultiversion optimistic concurrency control protocol(MVOCC). Various multiversion broadcast disk organizations are introduced. The MI-VI databroadcast mechanism supports disconnection. During broadcast cycle, the global validation information(VI)of transactions is broadcasted. The fastinvalidation reports(FIRs)are inserted after the IR to broadcast frequently updated data. Detailed simulation experiments are carried out to evaluatethe proposed multiversion data broadcast mechanism. The results reveal that the performance of the MV-IV data broadcast mechanism issignificantly better than other methods.