讀出數據先通 的英文怎麼說
中文拼音 [dòuchūshǔjùxiāntōng]
讀出數據先通
英文
read data strobe- 讀 : 讀名詞（語句中的停頓） a slight pause in reading
- 數 : 數副詞（屢次） frequently; repeatedly
- 據 : 據Ⅰ動詞1 （占據） occupy; seize 2 （憑借; 依靠） rely on; depend on Ⅱ介詞（按照; 依據） according...
- 先 : 名詞1 （時間或次序在前的） earlier; before; first; in advance 2 （祖先; 上代） elder generation; ...
- 通 : 通量詞（用於動作）
- 讀出 : read out; sense; sensing; playback; reading
- 數據 : data; record; information
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At first, in the introduct of the paper, i expatiate the develop status, deficiency and its background of one - card - system contractedly. next, in the second chapter of the paper, i expatiate the characteristic of lonworks fieldbus technology, and its net - connecting characteristic ; thirdly, the paper dwells on project design based on lonworks fieldbus technology, puts forward a new network struction. and demonstrate it ' s feasibility from system real - time, safety, expansibility and so on ; forthly, the paper gives the design of hardware and software of card reader and access controller ; at the end, namely, the fifth chapter of the paper, i give the design of the system web database in detail, according to the standardized design step
首先，在論文的緒論部分，簡要的闡述了一卡通系統的發展現狀及不足，以及課題背景等；其次，在論文的第二章，簡要介紹了lon總線技術的特點及網路特性；再次，在論文的第三章，給出了基於lon總線技術的詳細設計方案，提出了一種新穎的校園「一卡通」網路架構，並從系統實時性、安全性及擴展性等多個方面進行了論證；在論文的第四章，對讀卡機及門禁控制器進行了設計；最後，在論文的第五章，按照數據庫的規范化設計步驟，對系統web數據庫進行了設計並利用sqlserver2000數據庫管理系統進行了實施。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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