【正文】
cture stored in the data dictionary. Various data manipulation database (such as search, modify, insert and delete) and the maintenance of database management is a database model based on. ( 2) Application: the pilation contains applications to access the database statement, piled under the support of DBMS can run the program. ( 3) Interactive query: to provide interactive query language is easy to use, such as is responsible for executing the query mand, and query results are displayed on the screen. ( 4) Organize and access data: data storage device on the physical organization and access method in the periphery. ( 5) Transaction management: provide transaction management and operation of the transaction log, security monitoring and data integrity checks, concurrency control and transaction system recovery function. ( 6) The maintenance of the database: provide software support for database administrators, including data security, integrity and security, database backup, database reorganization and performance monitoring and maintenance tools. According to the thus summarizes the technical characteristics of the database, there are 5 characteristics: (1) the data model to represent plex data structures, data redundancy small, easy to expand, to achieve data sharing. (2) data and the independence of procedure has higher, independent database physical and logical independence. (3) the database system provides a convenient user interface for the user. (4) the database system to provide 4 aspects of data control function, respectively is the concurrency control, recovery, integrity and security. The use of the various application data in the database by the database system in accordance with the provisions, establish a certain data model to organize and, by the unified management and centralized control system. (5) increased the flexibility of the system. Select the database management system, the following aspects should be considered: (1) the difficult easy degree structure database. Needs analysis database management system has no paradigm, namely whether the real world must analysis required by the data model of the system, the establishment of the corresponding model。它對數據庫進行統(tǒng)一的管理和控制,以保證數據庫的安全性和完整性。 數據庫是通過數據庫管理系統(tǒng) (DBMSDATA BASE MANAGEMENT SYSTEM)軟件來實現數據的存儲、管理與使用的 dBASELL 就是一種數據庫管理系統(tǒng)軟件。到目前為止,在進行人工計算機化時,仍然缺乏設計經驗和 (或 )缺少信息服務人員與用戶之間的交流。多數聯(lián)機信息系統(tǒng)也有成批處理的要求。 語言翻譯處理層 語言翻譯處理層是對數據庫語言的各類語句進行語言分析、視圖轉換、授權檢查、完整性檢查等。數據庫的各種數據操作 (如查找、修改、插入和刪除等 )和數據庫的維護管理都是以數據庫模式為依據的。 ( 3)數據庫系統(tǒng)為用戶提供了方便的用戶接口。有無第四代語言的開發(fā)平臺 —— 第四代語言 具有非過程語言的設計方法,用戶不需編寫復雜的過程性代碼,易學、易懂、易維護。數據庫管理系統(tǒng)自動將數據包轉換成相應的協(xié)議數據。 對于分布式數據庫管理系統(tǒng),并發(fā)控制功能是必不可少的。 。 數據完整性指數據的正確性和一致性保護,包括實體完整性、參照完整性、復雜的事務規(guī)則。 包括數據透明與網絡透明程度。 (2) 程序開發(fā)的難易程度。 根據從而總結出數據庫的 技術特點,共有 5 個特點: ( 1)采用復雜的數據模型表示數據結構,數據冗余小,易擴充,實現了數據共享。用它書寫的數據庫模式被翻譯為內部表示。 根據處理對象的不同,數據庫管理系統(tǒng)的層次結構由高級到低級依次為應用層、語言翻譯處理層、數據存取層、數據存儲層、操作系統(tǒng)。例如,銀行將大量的支票編碼,然后在一天結束時,將所在支票分批、排序并進行處理。系統(tǒng)利用一個資源共享的數據庫來達到綜合的目的。特別是近年來推出的微型計算機關系數據庫管理系統(tǒng) dBASELL,操作直觀,使用靈活,編程方便,環(huán)境適應廣泛 (一般的十六位機,如 IBM/PC/XT,國產長城 0520 等均可運行種軟件 ),數據處理能力極強。當某個系統(tǒng)中存在結構上完全分開的若干個數據庫時,則該系統(tǒng)包含一個“數據庫集合”。 中文 3647 字 畢 業(yè) 設 計 ( 論 文 ) 英 文 翻 譯 課題名稱 系 部 電氣與信息工程學院電信系 專 業(yè) 電子信息工程 班 級 學 號 姓 名 指導教師 時 間 2 0 1 4 年 3 月 29 日 Introduction to database information management system The database is stored together a collection of the relevant data, the data is structured, nonharmful or unnecessary redundancy, and for a variety of app