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Download Chapter 11 PowerPoint Question Solution Describe the five logical
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Transcript
Chapter 11 PowerPoint Question Solution 1. Describe the five logical data groups or categories. Logical view – data is organized into groups or categories: character, field, record, table and database. Character– basic logical data element; a single letter, number, or special character such as a punctuation mark. Field– next higher level; group of related characters; Last Name for example; a data field represents an attribute. Record – a collection of related fields; a collection of attributes. Table – a collection of related records. Database – is an integrated collection of logically related tables. 2. What is the difference between batch processing and real-time processing? Batch processing – data collected and stored over time, several hours, days, or even weeks, and then processed at once as a “batch”. Real-time processing happens “now” instead of “later”. 3. Identify and define the five parts of DBMS programs. Database management systems (DBMS) – software that enables users to create, modify, and gain access to data. Five common data models: Hierarchical database, Network database, Relational database, Multidimensional database and Object-oriented database. Hierarchical- Data structured in nodes organized like an upside-down tree; each parent node can have several children; each child node can have only one parent. Network- Like hierarchical except that each child can have several parents. Relational- Data stored in tables consisting of rows and columns. Multi-dimensional- Data stored in data cubes with three or more dimensions. Object- oriented- Organizes data using classes, objects, attributes, and methods. 4. Describe each of the five common database models. Individual: Integrated files used by just one person. Company: Common operational or commonly used files shared in an organization. Distributed: Database spread geographically and accessed using database server. Commercial: Information utilities and data banks available. 5. What are some of the benefits and limitations of databases? Why is security a concern? Strategic uses: Data warehouse and data mining. Security: Databases are valuable and protection necessary.