Which statement accurately distinguishes the roles of the wrapper and source description in a mediated schema? The wrapper requests and parses data from the sources, while the source description converts data from the source schemas and values into the global representation. The source description requests and parses data from the sources, while the wrapper converts data from the source schemas and values into the global representation. (C) The wrapper abstracts source data, while the source description requests and parses data from the sources. D The source description abstracts source data, while the wrapper requests and parses data from the sources.
Which statement accurately distinguishes the roles of the wrapper and source description in a mediated schema? The wrapper requests and parses data from the sources, while the source description converts data from the source schemas and values into the global representation. The source description requests and parses data from the sources, while the wrapper converts data from the source schemas and values into the global representation. (C) The wrapper abstracts source data, while the source description requests and parses data from the sources. D The source description abstracts source data, while the wrapper requests and parses data from the sources.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Which statement accurately distinguishes the roles of the wrapper and source description in a mediated schema?
The wrapper requests and parses data from the sources, while the source description converts data from the source schemas and values into the global representation.
The source description requests and parses data from the sources, while the wrapper converts data from the source schemas and values into the global representation.
(C) The wrapper abstracts source data, while the source description requests and parses data from the sources.
D The source description abstracts source data, while the wrapper requests and parses data from the sources.
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