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Welcome to the Scalable End User Access to Big Data MCQs Page

Dive deep into the fascinating world of Scalable End User Access to Big Data with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Scalable End User Access to Big Data, a crucial aspect of Big Data Computing. In this section, you will encounter a diverse range of MCQs that cover various aspects of Scalable End User Access to Big Data, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Big Data Computing.

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Scalable End User Access to Big Data MCQs | Page 8 of 14

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Q71.
What is one of the main aspects considered when comparing schema mappings in research?

a.

Their ability to generate source data.

b.

Their ability to transfer target data.

c.

Their logical equivalence.

d.

Their semantic indistinguishability.

Discuss
Answer: (d).Their semantic indistinguishability. Explanation:One of the main aspects considered when comparing schema mappings in research is their semantic indistinguishability, which is captured by logical equivalence.
Q72.
What is one of the challenges in mapping management within the realm of OBDA?

a.

Analyzing schema mappings.

b.

Debugging schema mappings.

c.

Developing schema mappings.

d.

Transforming schema mappings for efficient query answering.

Discuss
Answer: (d).Transforming schema mappings for efficient query answering. Explanation:One of the challenges in mapping management within the realm of OBDA is transforming schema mappings for efficient query answering.
Q73.
Why might mappings in OBDA systems become obsolete?

a.

When the ontology changes.

b.

When the sources remain static.

c.

When new sources are added.

d.

When the mappings are initially defined.

Discuss
Answer: (a).When the ontology changes. Explanation:Mappings in OBDA systems may become obsolete when the ontology changes.
Q74.
What is the goal of mapping simplification in the context of OBDA?

a.

To create complex mappings.

b.

To maximize the expressiveness of mappings.

c.

To approximate complex mappings with tractable ones.

d.

To use rich mapping languages during query answering.

Discuss
Answer: (c).To approximate complex mappings with tractable ones. Explanation:The goal of mapping simplification in the context of OBDA is to approximate complex mappings with tractable ones while maintaining their expressiveness.
Q75.
How can the problem of accommodating new vocabulary or knowledge from new data sources be addressed in OBDA?

a.

By creating a new ontology from scratch.

b.

By using a constrained ontology profile.

c.

By approximating the ontology to be as expressive as possible.

d.

By applying formal meta-models to schema mappings.

Discuss
Answer: (c).By approximating the ontology to be as expressive as possible. Explanation:The problem of accommodating new vocabulary or knowledge from new data sources in OBDA can be addressed by approximating the ontology to be as expressive as possible while still falling within the required profile.
Q76.
What is the goal of defining a specific language for querying schema mappings?

a.

To create new mappings.

b.

To analyze schema mappings freely.

c.

To define formal meta-models.

d.

To specify ontology changes.

Discuss
Answer: (b).To analyze schema mappings freely. Explanation:The goal of defining a specific language for querying schema mappings is to analyze schema mappings freely.
Q77.
What is the purpose of designing a query language over a mapping meta-model?

a.

To simplify mapping management.

b.

To ensure the scalability of query answering.

c.

To create new data sources.

d.

To define formal meta-models.

Discuss
Answer: (b).To ensure the scalability of query answering. Explanation:Designing a query language over a mapping meta-model aims to ensure the scalability of query answering.
Q78.
How can reasoning techniques based on a mapping meta-model support the evolution of schema mappings?

a.

By creating new data sources.

b.

By defining formal meta-models.

c.

By approximating ontology profiles.

d.

By specifying actions in response to update operations.

Discuss
Answer: (d).By specifying actions in response to update operations. Explanation:Reasoning techniques based on a mapping meta-model can support the evolution of schema mappings by specifying actions in response to update operations on the meta-model instances.
Q79.
What is the main goal of a reasoning system that monitors changes and reactions to them in schema mappings?

a.

To create new mappings.

b.

To define formal meta-models.

c.

To analyze schema mappings freely.

d.

To specify actions in response to changes.

Discuss
Answer: (d).To specify actions in response to changes. Explanation:The main goal of a reasoning system that monitors changes and reactions to them in schema mappings is to specify actions in response to changes in the mappings.
Q80.
What is the primary motivation for using query rewriting techniques in the context of OBDA?How do succinct query expressions, such as nonrecursive Datalog programs, compare to unions of conjunctive queries (UCQs) in terms of query rewriting speed?

a.

To separate ontology reasoning from data reasoning.They are slower.

b.

To eliminate the need for query optimization.They are equally fast.

c.

To reduce the size of the ontology.They are orders of magnitude faster.

d.

To replace ontology reasoning with data reasoning.They are about the same speed.

Discuss
Answer: (b).To separate ontology reasoning from data reasoning.They are orders of magnitude faster. Explanation:The primary motivation for using query rewriting techniques in the context of OBDA is to separate ontology reasoning from data reasoning, which can be costly, especially in the presence of Big Data.Recent results have shown that using succinct query expressions, like nonrecursive Datalog programs, can be orders of magnitude faster than approaches that produce unions of conjunctive queries (UCQs) for query rewriting.
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