DeeDS towards a distributed and active real-time database system
DeeDS towards a distributed and active real-time database system
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DeeDS 迈向分布式主动实时数据库系统
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
B. Eftring
中科院分区：
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作者：
S. F. Andler;J. Hansson;J. Eriksson;J. Mellin;M. Berndtsson;B. Eftring
DeeDS将主动数据库功能与关键时间约束和集成系统监控相结合。由于反应式数据库机制或规则管理系统必须满足关键的截止日期，因此我们必须采用使规则的触发和操作的执行可预测的方法。我们将专注于调度问题与动态调度的工作负载，其中触发的事务有硬，硬或软的最后期限，以及如何瞬态过载可能会解决由计算上更便宜的事务替代。松耦合的通用事件监控设施，工程紧密连接的调度，提出的理由。为了提高性能和可预测性，调度程序和事件监视器在独立于系统其余部分的CPU上执行。DeeDS中的实时数据库访问通过采用诸如主存驻留数据、完全复制、最终一致性和防止全局死锁的方法而变得可预测和高效。
DeeDS combines active database functionality with critical timing constraints and integrated system monitoring. Since the reactive database mechanisms, or rule management system, must meet critical deadlines, we must employ methods that make triggering of rules and execution of actions predictable. We will focus on the scheduling issues associated with dynamic scheduling of workloads where the triggered transactions have hard, firm or soft deadlines, and how transient overloads may be resolved by substituting transactions by computationally cheaper ones. The rationale for a loosely coupled general purpose event monitoring facility, that works in tight connection with the scheduler, is presented. For performance and predictability, the scheduler and event monitor are executing on a separate CPU from the rest of the system. Real-time database accesses in DeeDS are made predictable and efficient by employing methods such as main memory resident data, full replication, eventual consistency, and prevention of global deadlocks.