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Data Warehouse and Mining Lecture Overview

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Data Warehouse and Mining Lecture Overview

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Questions and Answers

Which of the following best defines a data warehouse?

A database that supports decision-making by providing consolidated historical data (correct)

A database used for operational processes

A database that is integrated with the organization's operational database

A collection of unorganized and volatile data

What does it mean for a data warehouse to be subject-oriented?

It focuses only on real-time data

It integrates data from various operational databases

It excludes data that are not useful in the decision-support process (correct)

It includes all types of data, whether relevant to decision-making or not

What is the main purpose of a data warehouse in relation to information processing?

To provide a platform for consolidated, historical data for analysis (correct)

To manage real-time data from operational databases

To support transactional processing

To store unorganized and volatile data

In the context of data warehousing, what does 'time-variant' refer to?

The ability to change data over time Signup and view all the answers

What is the key feature that distinguishes a data warehouse from an operational database?

Separation from the organization's operational database Signup and view all the answers

What is the primary focus of data warehouse?

Data modeling and analysis for decision-makers Signup and view all the answers

Which type of data sources can be integrated into a data warehouse?

Multiple, heterogeneous data sources Signup and view all the answers

What distinguishes data warehouse data from operational database data in terms of time horizon?

Data warehouse data provides information from a historical perspective Signup and view all the answers

What is a characteristic of the key structure in the data warehouse?

Contains an element of time, explicitly or implicitly Signup and view all the answers

How does traditional heterogeneous DB integration differ from data warehouses?

Query-driven approach vs. update-driven, high performance Signup and view all the answers