实时内存数据库的内外存交换

The Data Swapping in the Real-Time Main Memory Database

实时数据库系统(RTDBS)的高性能要求以内存数据库(MMDB)作为其底层支持,为了保证MMDB在事务的执行过程中没有内外存的I/O,必须设计合理的存贮结构,提供合适的数据安置策略,给出合理的内外存交换算法。本文给出了适合实时应用要求的四层存贮体系结构,详细讨论了实时应用环境下的数据及事务特征,然后针对它们的特征,给出了一个内外存交换算法。

The high performance of Real - Time Database System (RTDBS) requires that the Main Memory Database (MMDB) be the base for it. To ensure that there is no data I/O during the execution of transaction, we must plan a reasonable storage architecture and a proper data allocation policy and give a good algorithm for data swapping, In this paper, we give a four- leveled storage architecture which is suitable for the reai-time environment, and then discuss the property of the data and transactions in the real- time application,and finally based on this,we give an algorithm for the dada swapping.