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Data Mining - Chapter 4 Data Warehousing and OLAP questions and answers
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Data Mining - Chapter 4 Data Warehousing and OLAP questions and answers
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Data Mining - Chapter 4: DataWarehousing and OLAP
questions and answers
Data Warehouse - answer A logical collection of information -
gathered from many different operational databases - that supports
business analysis activities and decision-making tasks
What are the four keywords use to describe a data warehouse? -
answer subject-oriented, integrated, time-variant, nonvolatile
Data Warehousing - answer the process of constructing and using
data warehouses
Query-Driven Approach - answer query is posed, metadata
dictionary is used to translate the query into an appropriate
language, results returned are integrated into a global answer set;
inefficient and potentially expensive for frequent queries
Update-Driven Approach - answer information from multiple
heterogeneous sources is integrated in advance and stored in a
warehouse for direct querying and analysis
Online Transaction Processing (OLTP) - answer Capturing of
transaction and event information using technology to process,
store, and update
Online Analytical Processing (OLAP) - answer Manipulation of
information to create business intelligence in support of strategic
decision making
, Is an OLAP system customer-oriented or market-oriented? - answer
market-oriented
What type of database design does an OLAP system typically have?
- answer a star or snowflake model and a subject-oriented design
Accesses to OLAP systems are mostly _____________ operations -
answer read-only
What are the three tiers in the three-tier architecture for data
warehouses? - answer Bottom tier: Data warehouse server
Middle tier: OLAP server
Top tier: Front-end tools
Relational OLAP (ROLAP) - answer extended relational DBMS that
maps operations on multidimensional data to standard relational
operators
Multidimensional OLAP (MOLAP) - answer special-purpose server
that directly implements multidimensional data and operations
Enterprise Warehouse - answer a data warehouse model that
collects all of the information about subjects spanning the entire
organization
Data Mart - answer contains a subset of corporate-wide data that is
of value to a specific group of users
Virtual Warehouse - answer A set of views over operational
databases. Only some of the possible summary views may be
materialized
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