Inquiry optimization in distributed data base 分布式數據庫中的查詢優化
At the same time , the development and application of spatial technology , of measuring and control technology , of information technology and of 3s technology also enable man gain more data and information timely and efficiently . now , data and information ' s process , transfer and storage can be dealt with network , moreover , distributed data base and interactive operating system on computer have already been exploited 空間技術、測控技術、信息技術、 3s技術的開發與應用使人們能夠及時、有效地獲取更多的資料和信息;資料、信息處理、傳輸、存儲的網絡化以及分布式數據庫和交互式操作系統的開發,使水文學及水資源學科研究得以迅速發展。
The agent technology was originated from the field , the mobile agent technology is the result of the ai technology combined with network technology , it has proved that introduce agent technology in distributed data base administration , can make the dbb more autonomy , transparency and sharing , and it can reduce the network width occupancy and time prolong Agent技術起源于人工智能領域,移動agent技術是人工智能與網絡技術結合的產物,把agent引入分布式數據庫管理之中,能更好地解決分布式數據庫的自治性、透明性、共享性等問題,并且能夠減少網絡的帶寬占用和時延。
On the bases of discussing the advantages and key technology to access ddb through the mobile agent technology , the writer has utilized mobile agent technology design distributed data base system in the subsystem of information management of military supplies of some armed division , and has realized mobile agent visit to distributed data base under ibm aglet development environment 簡要介紹了分布式數據庫的系統結構模型,討論了移動agent技術實現分布式數據庫訪問的優點和關鍵技術,并且在武警某師軍需信息管理子系統中利用移動agent技術設計分布式數據庫系統,在ibmaglet開發環境下實現了移動agent對分布式數據庫的訪問。