Master of Science in Engineering in Computer Science (MSE-CS) DIPARTIMENTO DI INGEGNERIA INFORMATICA AUTOMATICA E GESTIONALE ANTONIO RUBERTI Seminars in Software and Services for the Information Society Umberto Nanni Introduction to 1 Seminars of Software and Services for the Information Society Umberto Nanni Introduction to Datawarehousing
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Master of Science in Engineering in Computer Science (MSE-CS)
DIPARTIMENTO DI INGEGNERIA INFORMATICA AUTOMATICA E GESTIONALE
ANTONIO RUBERTI
(MSE-CS)
Seminars in Software and Services for the Information Society
Umberto Nanni
Introduction to
1Seminars of Software and Services for the Information SocietyUmberto Nanni
Introduction to Datawarehousing
Business Intelligence Architecture
management
management
system
goals results
management
system
rep
ort
ing
OLA
P
da
ta m
inin
g
Datawarehouse
Datamart-1 Datamart-2 Datamart-3
KPI DSS MKT HRCRM …
system
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operational
system
ETL systems
external
data
sources
service
systems
ERP
systems
internet /
extranet
operational system
What is Data Warehousing
Collection of methods, technologies and tools to
assist the “knowledge worker” (manager,
analyst) to conduct data analysis aimed at
supporting decision-making and/or improving
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the management of information assets
What is a Data Warehouse
A data warehouse is a collection of data
• integrated (far beyond the organization)
• consistent (despite the heterogeneous origin)
• focused (an interest area is defined)
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• historical (over a consistent timeframe)
• permanent (never delete your data!)
Purpose of a Data Warehouse
A Data Warehouse helps (allows) you:
• to take decisions
• to identify and interpret phenomena
• to make predictions about the future
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• to make predictions about the future
• to control a complex system
Value and quantity of information
value
BD
competitors
marketing
prices
sales
logistics
value
strategic
information
reports
selected
$$$$
competitors prices
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quantity
primary
information
sources
selected
information
$$$
OLTP & OLAP
OLTP - On-Line Transaction Processing
– realm of (write and / or read) transactions, recovery,
consistencyconsistency
– many, fast and frequent operations
– high level of concurrency
– access to a small amount of data
– on-the-fly data update
OLAP - On-Line Analytical Processing
read only
7Seminars of Software and Services for the Information SocietyUmberto Nanni