【摘要】 提出一种基于数据段优先级分区重装策略PRS-DSP,其考虑数据特征及与之相关的事务特点,根据数据段优先级对数据库进行分区,并为每个分区设置相应重装频率,故障恢复时按照数据分区的重装频率来分区重装数据库,系统恢复服务后,根据新事务对数据的请求及数据分区重装频率来设置剩余分区的重装优先级。模拟实验结果表明,该分区重装策略降低了系统事务超截止期比率,其重装性能明显优于完全重装策略。更多还原

【Abstract】 A partition reload strategy PRS-DSP(partition reload strategy based on data segment priority)based on the priority of data segment is presented,which partitions the database in accordance with the priorities of data segments and sets the corresponding reload frequency for each partition.It reloads the database in terms of partition reload frequency for crash recovery,which the system can serve before the entire database is reloaded.The reload priorities of the remaining partitions are set according to the requests of new transactions and reload frequency of partition after the system restores services.Simulation experiments show that,PRS-DSP reduces the system halt servicing time and improves the system availability during the recovery,demonstrating a better performance than the complete reload strategy.更多还原