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Data Warehouses in Management Information Systems

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Data Warehouses in Management Information Systems

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Questions and Answers

What is the primary problem that data warehouses aim to solve?

Lack of digital libraries

Heterogeneous information sources (correct)

Inconsistent data representations

Duplicate scientific databases

Which function is NOT listed as a reason for needing data warehouses?

Improved query performance

Separating research and decision support functions from operational systems

Consolidation of information resources

Real-time data processing (correct)

What are data warehouses considered to be a foundation for?

Inventory management systems

Social media marketing

Telecommunications infrastructure

Advanced reporting and OLAP tools (correct)

Which type of customers' behavior can data warehouses help analyze?

Lowest/highest margin customers Signup and view all the answers

What is the main characteristic of subject-oriented data in a data warehouse?

It is categorized and stored by business subject Signup and view all the answers

What does the term 'time-variant' refer to in the context of a data warehouse?

Historical data is kept in the data warehouse Signup and view all the answers

What does 'nonvolatile' mean when describing data in a data warehouse?

Data is not updated or deleted Signup and view all the answers

What is the main reason for not deleting or updating data in a data warehouse?

To ensure a continuous increase in data volume Signup and view all the answers

What is the significance of integrating different types of data into a single environment in a data warehouse?

It enhances the accuracy and integrity of the data Signup and view all the answers

What distinguishes the information storage in a data warehouse from that in a traditional database?

Information is multidimensional with layers of columns and rows Signup and view all the answers

What is the purpose of the process known as 'Extraction, transformation, and loading (ETL)'?

To convert data from the format of operational systems to the data warehouse format Signup and view all the answers

What is the function of a 'data mart' in the context of a data warehouse system?

It provides a snapshot of chosen subsets of source data Signup and view all the answers

In 'Extraction, transformation, and loading (ETL)', what does the 'refresh mode' refer to?

Bulk rewriting of target data at periodic intervals Signup and view all the answers

What is the key feature that distinguishes 'Data Marts' from the overall data warehouse?

They provide a focused portion of the warehouse information Signup and view all the answers