查詢響應通信 的英文怎麼說
中文拼音 [zhāxúnxiǎngyīngtōngxìn]
查詢響應通信
英文
inquiry-response communication-
This paper brings forward a dynamic group cache mechanism, which fully considers data access frequency, validity and consistency of data, and which reduces the network load and improve the response speed by reducing the distance of data transmission
本文提出的組緩沖機制，充分考慮了數據訪問頻率、數據有效性和一致性，將部分數據緩沖在組內，減少了查詢時數據傳輸的距離，進而減少網路通信開銷，提高查詢響應速度。The working principle and realization of large led electric screen are introduced. on hard design, three cpu cooperate to improve the stability of communication and speed of refurbishing screen. on soft design, compiles database program with ole db ; realize the db querying program with foxpro ; improves the slow speed in communication with multi - thread ; controls the releasing of information with working - table and releasing - table, develops the information releasing columns
在控制軟體中，採用oledb方法實現了數據庫編程；應用foxpro實現了數據庫的信息查詢；採用了windows多線程方法解決由於通信速度慢對軟體其它部分或其他應用軟體的影響；實現了由作息時間表和節目播放表來控制信息發布，開發了適合高校教務管理的信息播放欄目。As the application of distributed computing is used much more widely ， distributed database becomes a significant part of information management it avoids a lot of disadvantages of conventional centralized database ， and is applicable to many situations distributed database is a set of data which is the unity logic ， but in fact these data is located on different sites it is of high availability ， easy expansibility ， high concurrency ， high efficiency and etc in distributed system ， data redundancy is a method to improve the speed of query and the availability of system distributed query should shield the lower level details of data redundancy from end users ， distributed transaction should ensure data from disaccord this paper introduces basic conceptions of distributed database firstly ， discusses distributed transaction and concurrent control ， describes the development prototype mysql ’ s characters ， architecture and executive mechanism ， then shows the skeleton model of dpsql and exposes the strategy and algorithm of distributed query and distributed transaction ， at last analyzes the extra expenses and response delay of distributed processes this paper exposes the implementation mechanism of distributed query and distributed transaction emphatically distributed query uses the strategy of “ read one ， write a11 ” s0 in such a system if user ’ s requests are read - - only for the most part and the distribution of data redundancy is plausible ， efficiency is very high distributed transaction uses two - 。 phase commit protocol to ensure the consistency of global data ， which has less communication overhead
分散式查詢需要向用戶屏蔽數據冗餘分散的底層細節，分散式事務處理要保證全局數據完整，這都是傳統集中式數據庫不曾面臨的問題。本文首先介紹了分散式數據庫的概念性問題；接著討論了分散式事務涉及的定義及演算法；然後描述了dpsql的原型mysql的特性、結構和執行機制；繼而給出了dpsql的梗概模型，闡述了實現分散式查詢和分散式事務處理的策略及演算法；最後分析了進行分散式處理給系統增加的額外開銷和客戶端的額外響應延遲。本文重點描述了分散式查詢和分散式事務處理的實現機制，分散式查詢採用」讀一個寫全部」的本地優先策略，在讀操作頻繁的系統中，只要庫的分佈合理，單機效率極高，幾乎無任何附加開銷和延遲，而以整個系統的角度看來，吞吐量就更是優于單機系統；分散式事務處理採用兩階段提交協議，通信次數較少並能確實保證副本一致。
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