满足嵌入式实时数据库系统的可预见能力

可预见能力是嵌入式实时数据库系统必须具备的特性，目前还未发现有关的研究报道，我们研制的嵌入式实时数据库系统主要从四个方面提高系统的可预见能力，存取扩展数据，使系统内部控制可见，便于透明地处理系统纠偏；基于功能替代的实时事务模型，它支持方案多选，具有丰富的可预见描述能力，支持事件驱动的主动触发机制，能对系统的瞬时发生作出应急反应，多层次的实时事务调度，能大大提高实时事务对动态实时环境的的应变能力和系统的成功率。

Satisfying Predictability for Embedded Real-time Database Sys tems

Predictability is a basic feature of embedded real-time database systems. We have not found any reports about it. Our embedded real-time database systems realize the predictability from four aspects: accessing extra-data in order to see system' control and recovery from fail status; a transaction model supporting RT-TR' function alternative characteristic, it has luxuriant semantic ; an active trigger mechanism that can meet an emergency; multi-level transaction schedule can enhance the ability of transaction suiting for real-time environment and increase systems success ratio.