14 Questions
What is the primary problem that data warehouses aim to solve?
Heterogeneous information sources
Which function is NOT listed as a reason for needing data warehouses?
Real-time data processing
What are data warehouses considered to be a foundation for?
Advanced reporting and OLAP tools
Which type of customers' behavior can data warehouses help analyze?
Lowest/highest margin customers
What is the main characteristic of subject-oriented data in a data warehouse?
It is categorized and stored by business subject
What does the term 'time-variant' refer to in the context of a data warehouse?
Historical data is kept in the data warehouse
What does 'nonvolatile' mean when describing data in a data warehouse?
Data is not updated or deleted
What is the main reason for not deleting or updating data in a data warehouse?
To ensure a continuous increase in data volume
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
What distinguishes the information storage in a data warehouse from that in a traditional database?
Information is multidimensional with layers of columns and rows
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
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
In 'Extraction, transformation, and loading (ETL)', what does the 'refresh mode' refer to?
Bulk rewriting of target data at periodic intervals
What is the key feature that distinguishes 'Data Marts' from the overall data warehouse?
They provide a focused portion of the warehouse information
Learn about the role of data warehouses in modern organizations and how they solve the problem of heterogeneous information sources by providing a single, complete, and consistent store of data from different sources.
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