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Data Warehouse Definition Quiz

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Questions and Answers

What is a data warehouse?

A database containing integrated, aggregated, and structured data from multiple operational systems (correct)

A database containing data from a single operational system

A database containing unstructured data from multiple operational systems

A database containing randomly collected data from various sources

According to William Inmon, what are the characteristics of a data warehouse?

Subject-oriented, isolated, static, and volatile

Real-time, static, non-integrated, and dynamic

Real-time, non-integrated, variable, and volatile

Subject-oriented, integrated, time-variant, and nonvolatile (correct)

How is a data warehouse organized according to subject orientation?

Focused on collecting unstructured data for reports

Organized around random subjects without any specific focus

Organized around daily operations and transaction processing

Focused on modeling and analysis of data for decision-makers (correct)

What is the characteristic of a data warehouse being 'integrated'?

Constructed by integrating multiple, heterogeneous data sources Signup and view all the answers

What is the purpose of a subject-oriented data warehouse?

To focus on the modeling and analysis of data for decision-makers Signup and view all the answers

Why is consistency in naming conventions and encoding structures important in a data warehouse?

To ensure consistency among different data sources Signup and view all the answers

What is the key difference in the time horizon between operational systems and data warehouse data?

Operational systems have a shorter time horizon compared to data warehouse data Signup and view all the answers

What is a characteristic of the key structure in the data warehouse when it comes to time?

It may or may not contain a time element Signup and view all the answers

What is a characteristic of data warehouse environment in terms of operational update of data?

No operational update of data occurs in the data warehouse environment Signup and view all the answers

What are the minimal operations required for data accessing in the data warehouse environment?

Only initial loading of data and access of data are required Signup and view all the answers

Why does decision support require historical data which operational databases do not typically maintain?

To provide insights from a historical perspective Signup and view all the answers

What is the main reason for requiring consolidation (aggregation, summarization) of data from heterogeneous sources in decision support systems?

To reconcile inconsistent data representations from different sources Signup and view all the answers

What is an example of an Online Analytical Processing (OLAP) server type that directly implements multidimensional data and operations?

Multidimensional OLAP (MOLAP) Signup and view all the answers

What is the primary purpose of a Data Mart within an organization?

To focus on selected subjects within an organization Signup and view all the answers

What type of server is almost always a relational DBMS, rarely flat files, in the Three-Tier Decision Support Systems architecture?

Three Warehouse database server Signup and view all the answers