1 / 9

CIS 429—Chapter 7

CIS 429—Chapter 7. Storing Organizational Information—Databases. Storing Organizational Information. Information is everywhere in an organization Information is stored in databases Database – maintains information about various types of objects (inventory) events (transactions)

nuwa
Télécharger la présentation

CIS 429—Chapter 7

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CIS 429—Chapter 7 Storing Organizational Information—Databases

  2. Storing Organizational Information • Information is everywhere in an organization • Information is stored in databases • Database – maintains information about various types of • objects (inventory) • events (transactions) • people (employees) • places (warehouses)

  3. Relational Database Fundamentals • Database • ___________ information • Database models • Hierarchical • Rigid tree-like model • Used in early DB management systems • Network • Lattice structure • Child records can have many parent records • ____________ • Uses logically related two-dimensional tables

  4. Relational Database Fundamentals (2) • Entities, Entity Classes, and Attributes • Entity • person, place, thing, transaction, event • Entity class • a ________, a collection of similar entities • Attributes • fields or columns in a table, characteristics of entities • Keys and Relationships • Primary key • A field or group of fields that uniquely identify an entity • _________ key • A primary key of one table that is a field of another table

  5. Relational Database Advantages • Increased Flexibility • Physical view • Physical storage of information on a device • _________ view • How users logically access the information • Different users have different logical view to meet their needs • Increased Scalability and Performance • Scalability • How well a system can adapt to __________________ • Performance • How quickly a system performs a process or transaction

  6. Relational Database Advantages (2) • Reduced Information Redundancy • Redundancy • __________ duplication of information • Increased Information Integrity (Quality) • Information integrity • Measure of the quality of information • Integrity constraints • _________ to ensure the quality of information • Relational integrity constraints ensure basic and fundamental quality • Business-critical integrity constraints enforce business rules • Increased Information Security (passwords, etc.)

  7. Database Management Systems • A database management system (DBMS) is software that allows users to interact w/ a DB. • A DBMS has several components • Data ____________ Component • Creates and maintains the data dictionary and DB structure • Data dictionary stores definitions of information types • Data Manipulation Component • Allows users to do ________ • Create, read, update, and delete information • A view allows users to see the contents of a DB • Report generators are used to define reports from the DB • QBE (________ by example) tools define answers to questions • SQL (structured query language) is a language to query the DB

  8. Database Management Systems (2) • A DBMS has several components (continued) • Application Generation Component • Contains tools for creating easy-to-use applications, such as SCM or CRM • Data Administration Components • Contains tools for managing the overall database environment • Backup, recovery, _________, and performance

  9. Integrating Information among Multiple Databases An integration allows separate systems to communicate directly with each other A __________integration takes new information and sends it to all downstream systems and processes A backward integration takes processed information and sends it automatically to all upstream systems and processes

More Related