移动事务的数据收集与存储

数据收集是移动数据库中的一个关键问题,将数据收集到移动客户机的缓存中,使客户机在断接期间使用本地数据自主操作,提高了数据的可用性。文章提出了根据移动事务相关图的事务序列进行收集和淘汰的收集方法,以属性—事务片段存取集和元组—事务片段存取集组成收集单元,以此为收集粒度,方便收集,并节省空间。解决了数据收集中收集内容与收集单元的问题。

Data Hording and Storing for Mobile Transaction

Data Hoarding is a key issue in mobile database.It will support the autonomy operation of mobile hosts when they are disconnected from servers by prefetching important data into local cache.In this paper a hoarding method is proposed,in which data is hoarded according to the transaction sequence in the transaction relation graph.An at-tribute-transaction access segment and a tuple—transaction access segment are used in this method as hoarding unit,and this will help the hoardings and save storage room.Problems about hoarding content and hoarding unit are solved in this paper.