多版本调度器的分析

MULTIVERSION SCHEDULER ANALYSIS

本文针对目前许多多版本调度器算法在实际运行中性能不佳的情况,从理论上研究了多版本调度器的能力,并在此基础上提出了改善多版本调度器性能的方法。文中指出:1)多版本调度器可以对事务中的只读和只写操作做特殊处理;2)实际的多版本调度器除了必须满足可串行性原则外还应该满足合理性原则;3)采用保守方式对多版本调度器具有特别重要的意义。

The power of MV scheduler is studied theoretically first, and then the way to improve MV scheduler's performance is discussed. We point out that: 1) MV scheduler can do special processes on read-only or write-only operations; 2) a real MV scheduler should satisfy not only serializability rule but also rationality rule; 3) using conservative approach in MV scheduler has special significance.