Which of the following statements is true about data warehouse integration systems and virtual data integration systems? (A) A virtual data integration system uses ETL, or extract-transform-load, tool pipelines that periodically extract data from the sources and load them an application. Both data integration architectures use a mediated schema. A data warehouse integration system leaves data in the sources and accesses them as needed at query time. In the warehousing approach, the user poses queries in terms of the warehouse schema

Principles of Information Systems (MindTap Course List)
13th Edition
ISBN:9781305971776
Author:Ralph Stair, George Reynolds
Publisher:Ralph Stair, George Reynolds
Chapter5: Database Systems And Big Data
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Which of the following statements is true about data warehouse integration systems and virtual data integration systems?

(A) A virtual data integration system uses ETL, or extract-transform-load, tool pipelines that periodically extract data from the sources and load them an application.

Both data integration architectures use a mediated schema.

A data warehouse integration system leaves data in the sources and accesses them as needed at query time.

In the warehousing approach, the user poses queries in terms of the warehouse schema

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