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.

• 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。