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Data Warehouse Implementation Goals

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Questions and Answers

Which function involves gathering data from multiple, heterogeneous, and external sources?

Data extraction (correct)

Load

Data cleaning

Data transformation

What are the main functions of data loading in a data warehouse system?

Sorting and summarizing

Indexing and partitioning

Consolidating and computing views

All of the above (correct)

What is the purpose of data cleaning in a data warehouse system?

To propagate updates from the data sources

To consolidate and compute views

To detect errors and rectify them (correct)

To gather data from multiple sources

Why are data cleaning and data transformation considered important in improving data quality?

They enhance the performance of data mining Signup and view all the answers

What is the primary purpose of a data warehouse?

To provide information from a historical perspective and serve as a physical implementation of a decision support data model Signup and view all the answers

Why does a data warehouse not require transaction processing and recovery mechanisms?

Because it only requires initial loading of data and access of data Signup and view all the answers

What is meant by the term 'time-variant' in the context of a data warehouse?

Data are stored to provide information from a historical perspective Signup and view all the answers

What are the key components to consider in the initial deployment of a data warehouse?

Budget allocations, number of data sources selected, and data warehouse administration Signup and view all the answers

What does data warehouse administration encompass?

Planning for disaster recovery, managing access control and security, and controlling the number of reports Signup and view all the answers

What functions do data warehouse development tools provide?

Defining and editing metadata repository contents, shipping metadata to and from relational database system catalogs, and managing access control Signup and view all the answers