主存数据库系统与技术

主存数据库管理系统充分利用当前硬件和先进体系结构所提供的物质条件，如大容量主存，大规模并行计算机体系结构、客户／服务器模型以及网络计算机环境，把所管理的数据全部存于物理内存中以获得非常高的存取速度，这使得ＭＭＤＢ技术和系统可以很好地满足某些在线或实时应用场合的需求．传统数据库中的优化措施是针对磁盘存储特性的，ＭＭＤＢ则采用不同的技术来组织数据和保持数据的可靠性．本文将讨论一些主要的技术以及这些技术在某些已设计或实现的系统中的应用．

MAIN MEMORY DATA BASE SYSTEMS AND TECHNIQUES

Main Memory Data Base Management System makes the best use of current hardware and advanced architecture benifits, eg., the emerging large volume memory,massive parallel computer architecture, Client/Server model and network computer. Storing its data in main physical memory to get very high speed access, MMDB validates its use for some on -line or real time applications. Coventional database systems are optimized for the particular characteristics of disk storage mechanisms. MMDB, on the other hand, use different optimizations to structure and organize data, as well as to make it reliable.The major techniques and their usage in some designed or implemented MMDB systems will be surveyed in this paper.