随着便携式移动计算机的越来越广泛的应用，移动实时数据库应用也越来越普遍。
With the popularity of portable computer, the application of mobile real-time database becomes more and more common.
尤其就资源的有限性而言，它导致系统不可能完全满足移动实时数据库系统性能多方面的要求。
The unpredictable system workload and even possible overloading, the limited system resources are the problems which must be resolved in mobile real-time applications.
而且，由于移动实时数据库系统中大多数事务都是复杂的嵌套事务，传统调度策略都已不太适用。
Moreover, conventional concurrency control and scheduling methods for update transactions are not suitable in that mobile real-time transactions are complicated and nested.
而且，由于移动实时数据库系统中大多数事务都是复杂的嵌套事务，传统调度策略都已不太适用。
Moreover, conventional concurrency control and scheduling methods for update transactions are not suitable in that mobile real-time transactions are complicated and nested.
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