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MGT300 - Chapter 7: Viewing Database and Protecting Organizational Information

Relational Database Fundamental
-Information is everywhere in an organization
-Information is stored in databases
-Database: maintains information about various types of objects(inventory), events(transactions), people(employees), and places(warehouse)
-Database models include:
l  Hierarchical database model- information is organized into a tree-like structure (using parent/child relationship)in such a way that it cannot have too many relationship


 
l  Network database model- a flexible way of representing objects and their relationship




 
l  Relational database model- stores information in the form of logically related two-dimensional tables
 
v  Entities and Attributes
l  Entities- a person, place, thing, transaction, or event about which information is stored
l  Attributes' (fields, columns)- characteristic or properties of an entity class

Keys and Relationships
-Primary keys and foreign keys identify the various entity classes (tables) in the database
l  Primary key- a field (or group of fields) that uniquely identifies a given entity in a table
l  Foreign key- a primary key of one table that appears an attribute in amother table and acts to provide a logical relationship among the tables

Relational Database Advantages
-Database advantages from a business perspective include
i.          Increased flexibility- A well-designed database should:
*Handle changes quickly and easily
*Provide users with different views
*Have only one physical view
-physical view: deals with the physical storage of information on a storage device. Eg : hard disk
-Logical view: focuses on how users logically access information
ii.        Increased Scalability and Performance- A database must scale to meet increased demand, while maintaining acceptable performance levels
-Scalability- refers to how well a system can adapt to increased demands
-Performance- measures how quickly a system performs a certain process or transaction
 
  Database Management Systems (DBMS)
  • software through which users and application programs interact with a database


DATA-DRIVEN BUSINESS INTELLIGENCE

BI in a data-driven website


INTEGRATING INFORMATION AMONG MULTIPLE DATABASES
·         Integration – allows separate systems to communicate directly with each other
·         Forward integration – takes information entered into a given system and sends it automatically to all downstream systems and processes
·         Backward integration – takes information entered into a given system and sends it automatically to all upstream systems and processes

INTEGRATING INFORMATION AMONG MULTIPLE DATABASES
Forward integration and backward integration


INTEGRATING INFORMATION AMONG MULTIPLE DATABASES
Building a central repository specifically for integrated information



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