e-Commerce Data
Data issues in electronic
commerce.
e-Commerce in 2000: $6.9b
10%
5%
32%
10%
19%
24%
Computers
Travel
Entertainment
Gifts, Flowers
Apparel
Other
Demographics
30 something years old
College educated
$50,000 - $60,000 income
Modem access over telephone lines
e-Business functions
Publish Information
Accept registrations
Execute transactions
Connect partners
B2C
Retail Storefronts
Customer sales and transaction
Limited client functionality
Public access
Poorly understood economic justification
Customer relationship management
B2B
Business to business
Business order processing
Supply chain management
100 times the retail sales volume
Business interconnection
EDI
Fat client capability
Resource Constraints
Managing critical resources
determines data architectures
Processing
Storage
Access/communication
Security
Why Use a Database
Management System?
Storing and Retrieving Data
Managing Metadata
Supporting Simultaneous Data Sharing
Providing Transaction Atomicity
Providing Authorization and Security
Services
Increasing Programmer Productivity
Using Data Effectively
Process transactions efficiently
Access warehouse data flexibly
Manage the data resource
data administration
database administration
Global issues
Data Usage
Transaction: process orders
Real Time
Volatile
Optimized for Update
Warehouse: discover opportunities
Time Stamped
Static
Optimized for Retrieval
Conventional Files: Cons
Data redundancy
Data inconsistency
Inflexibility (program/data
dependence)
Difficulty responding to ad hoc
requests
Problems in sharing data
Security problems
Definitions
Database -organized set of files
Database Management System software that organizes,
manipulates, and retrieves data
stored in a database
Databases - Pros
Reduced redundancy
Increased data integrity
Increased flexibility (program/data
independence)
Increased ability to respond to ad
hoc requests
Increased ability to share data
Improved data security
Databases - Cons
Increased complexity
Slower processing speed
Greater disk space requirements
Higher initial development costs
Increased vulnerability
Database Topology
Centralized - all related files in
one physical location
Distributed - multiple locations
External - database wholly
outside organization but
accessible by communications
Centralized Database
Centralized Databases
Database contained in a single
location
Control of data quality and security
Easier multi-user management
Not scalable
Needs substantial processing power
Requires substantial communication
Distributed Databases
Copies of a database, or portions
of one, in multiple locations
Problems with concurrency
Replicated vs. partitioned
Horizontal vs. vertical partitioning
Consider use vs. updating
Distributed Database
External Databases
Database managed by another
organization outside of the
company network
Better security
Loss of control
External Database
A commercial provider
Views of Data
Logical
Physical
In database, logical view is
separated from physical view
Databases vs Files
Relational vs Other
Legacy/Server/Client
Centralized/Distributed (horizontal &
vertical)/Replicated
Multi-tier architecture
Transaction/Warehouse