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.

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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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