are presented to the DBMS. Assume that the concurrency control mechanism is Strict 2PL with timestamps used for “Wait-Die” (i.e., if Ti occurs before Tj, then Ti waits; otherwise Ti aborts). Describe how the concurrency control mechanism handles the sequence of actions. T1: R(X), T2: W(X), T2: W(Y), T3: W(Y), T1: W(Y), T1: Commit, T2: Commit, T3: Commit Assume that the timestamp of transaction Ti is i. Add appropriate lock and unlock requests to the sequence of actions. The DBMS processes actions in
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Management Information System 2 Marks UNIT 1 MIS Introduction 1. Data: Raw facts such as an employee’s name and number of hours worked in a week, inventory part numbers or sales orders. Information: A collection of facts organized in such a way that they have additional value beyond the value of the facts themselves. Data Information Salesperson: J. Jones Sales Territory: Western Region. Current Sales: $147,000 Units = 147 Salesperson: J. Jones Sales Territory: Western Region.
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669 Database Design and Implementation for Business SQL Lab 4 Instructions: Procedural SQL Objective The objective of this lab is to teach you how to develop and use basic stored procedures and triggers the procedural language of your chosen DBMS. Prerequisites Before attempting this lab, it is best to read the textbook and lecture material covering the objectives listed above. While this lab shows you how to create and use these constructs in SQL, the lab does not explain in full the theory behind the
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資料庫系統概論 第一章 問題回顧 1.1 請定義下列的術語：資料、資料庫、DBMS、資料庫系統、資料庫目錄、程 式資料獨立、使用者景觀 、DBA、終端使用者、固定交易、演繹資料庫系統、 永久物件、中繼資料、交易處理應用程式。 資料：已經紀錄的事實。 資料庫：一群相關資料的集合。 DBMS：一種能讓使用者有能力去建立與維護資料庫的程式所組成的集合。 資料庫系統：電腦化的資料儲存系統包含資料庫與資料庫管理系統軟體。 程式資料獨立：在 DBMS 目錄裡，資料檔案的結構和存取程式是分開的。 使用者視界：資料庫的子集合或是由資料庫檔案所衍生出來的虛擬資料。 DBA：負責管理資料庫以及 DBMS 與其他相關軟體。 終端使用者：使用資料庫來查詢、更新以及產生報表的使用者。 固定交易：查詢與更新已經經過嚴謹程式化和測試過的資料庫。 演繹資料庫系統：提供定義演繹規則的能力，能從已儲存的資料庫事實中推論出新資訊。 永久物件：程式語言的複雜物件可以永久儲存在物件導向的 DBMS 中。 中繼資料：儲存在目錄裡的資訊，描述主要資料庫的結構。 交易處理應用程式：執行一個牽涉資料庫存取的程式或一個處理動作，確保一個或是多個交易能
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INSTRUCTIONS: 1. Form a group – consist of FOUR (4) students 2. Answer all the questions below. FORMAT of YOUR REPORT: 1. Cover – consist of your name and student id 2. Content – * Separate the answer for Chapter 5 and Chapter 6 * PART A: Answer all the questions and please include all the questions as well. * PART B: Discuss the case studies and answer all the questions given. 3. References – include the link or your references Due of Submission: 10th May 2016 (Tuesday) before
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means easy administration for the DBMS but poor throughput. A low level of control granularity means difficult administration for the DBMS, but better throughput. 8. Atomicity states that database modifications must follow an all or nothing rule. Each transaction is said to be atomic. If one part of the transaction fails, the entire transaction fails. It is critical that the database management system maintain the atomic nature of transactions in spite of any DBMS, operating system or hardware failure
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Introduction to SQL * What is SQL: SQL environment, the three types of commands (DDL, DML, DCL) * SQL * Structured Query Language * High level declarative language for relational database * De facto standard in the database world * Is now an official standard too, accepted by * American National Standards Institute (ANSI) * International Organization for Standardization (ISO) * The first standard (1986): SQL/86 * Several
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an implicit meaning. Database: a collection of related data. DBMS: a program/software package that manages a database. Database system: DBMS software together with the data itself. Sometimes, the applications are also included. Database catalog: provide a list of all databases on a server. You use the server Catalog task to create a database catalog. Meta-data: The database definition of descriptive information is also stored by the DBMS in the form of a database catalog or dictionary. Program-data
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Introduction to Data base Relational Model Database design Structured Query Language (SQL) 22 Let’s begin the journey !! …. in to fascinating world of databases 23 Today’s outline Database Management System (DBMS) Entity-Relationship (ER) Model 24 What is a database? Many people would like to call it organization… 25 What is a database? Database is a structured collection of related data. Many name it efficiency… 26 A database
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Define the term database. Ans. Database is a collection of data in an organized form which allows a user for fast storage and retrieval of required data. 1.27 Is Microsoft Access a DBMS? Why or why not? Ans. Microsoft Access is not just a DBMS it is also an Application Generator. Although Microsoft Access contains a DBMS engine that creates, processes, and administers the database, it also contains form, report, and query components that are the Microsoft Access application Generator. 1.33 Name the
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