航天实时内存数据库存取机制MCacheTree的研究  

Research on access mechanism of real-time memory database systems for space: MCacheTree

作　　者：甘杉[1] 郭丽丽[1] 

机构地区：[1]中国科学院光电研究院,北京100190

出　　处：《计算机工程与设计》2010年第17期3827-3830,共4页Computer Engineering and Design

摘　　要：考虑到空间环境探测、空间科学实验所产生的数据时效性比较强,为了对它们进行有效的管理,研究了提高实时性能的索引技术。由于IO速度较慢、外存延迟时间难以预测,实时数据库系统通常采取内存数据库技术。基于此,提出了一种新的适合航天实时内存数据库系统的索引结构:MCacheTree,它将内存缓存和检索树有机地结合起来,并应用延迟写和延迟删除的优化技术,有效地降低了查询时间,提高了实时性能。最后通过实验验证了该设计的高效性。In order to effectively manage the real-time data generated by the space environment exploration and the space science experiments,the technology of index to raise real-time performance is researched.The speed of IO is too slow,and it is also difficult to predict the delay time of the secondary storage,so real-time database systems（RTDBS） is often use memory database technology.Based on this,a new index structure（MCache Tree） is proposed,which applicable to RTDBS.It combines memory cache with index tree,adopts the optimization of delayed write and delayed delete strategy to reduce the query time and to improve real-time performance.At lase a experiment shows the efficiency of the design.

关 键 词：航天数据库 实时数据库 内存数据库 存取机制 索引 HASH缓存 

分 类 号：TP311.131[自动化与计算机技术—计算机软件与理论]