HA结构HLR系统数据一致的实现

Implementation of Data Coherence for a HLR System in the HA Structure

在高性能商用数据库的管理下，以双服务器外挂同一盘阵的 ＨＡ系统模式为结构的 ＨＬＲ数据库系统具有良好的数据安全与完备性，但无法满足 ＨＬＲ系统的实时性要求。为此，引入内存缓存，以提高系统处理的实时性，但需解决内外存及主备端内存的数据一致。文章分析了 ＨＡ结构下 ＨＬＲ数据库系统的结构和数据组织，定义了修改图样，提出了实现数据一致的方法。

Under the management of high-grade commercial database system, the HLR database system posseses good data-security and data-integrity, however it can' t meet the demand of real time. In order to improve the system's performance, an EMS memory cache is used. Then, the data coherence between disk and memory and between host and backup must be solved. This article analyses the structure of HLR database system and dare orgnization, defines 'Modified Draft', and put forward a way to realize data coherence.