ITM 102 Lecture Notes - Lecture 7: Extranet, Management System, Relational Database

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ITM102 - Business Driven Information Systems - Lecture 7: Databases and Warehouses
Organizational data and information
Information - data converted into meaningful text.
Information granularity - extent of detail within respective information.
Real time information - immediate, up-to-date information.
Real time system - provides real time information in response to requests.
Sources of low quality information have many features.
1. Online customers intentionally enter inaccurate information to protect their
2. Data or information from different system have different entry standards and
3. Call centre operators enter abbreviated or erroneous information by accident
or to save time.
Potential business effects resulting from low quality information have many features.
Inability to accurately track customers; inability to identify valuable customers;
marketing to nonexistent customers; tracking revenue due to inaccurate
invoices; and inability to build strong customer relationships.
Database - collection of records about various business strategies.
Operational information system such as SCM and CRM maintain access to transactional
data in databases.
Hierarchical database model - information is organized into a tree-like structure in
such a way that it cannot have too many stems.
Network database model - a flexible way of representing objects and their
Relational database model - stores information in the form of logically related
two-dimensional tables, the most common business databases today are these.
Entity class - category of a person, place or thing.
Entity - individual person, place or thing.
Attributes - characteristics of an entity class (such as data, identification, contact
information and phone number).
Data keys
Primary key - field of group that contains values that uniquely identify a given record in a
Foreign key - a primary key of one table that appears in another. Accessing both keys in
different areas will correspond to each other.
Relationships - data from one table is linked to another when computers find and
match between the two.
A well designed database has many unique features.
Handle changes quickly and easily; provide users with different views and have
multiple logical views.
Physical view - deals with physical storage of information on a device.
Logical view - focuses on how users logically access information.
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