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Welcome to the OLAP in the Data Warehouse MCQs Page

Dive deep into the fascinating world of OLAP in the Data Warehouse with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of OLAP in the Data Warehouse, a crucial aspect of Data Warehousing and OLAP. In this section, you will encounter a diverse range of MCQs that cover various aspects of OLAP in the Data Warehouse, 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 Data Warehousing and OLAP.

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Check out the MCQs below to embark on an enriching journey through OLAP in the Data Warehouse. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Data Warehousing and OLAP.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of OLAP in the Data Warehouse. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

OLAP in the Data Warehouse MCQs | Page 10 of 13

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Q91.
How does OLAP data differ from data in the data warehouse in terms of summarization?

a.

OLAP data has more summarization

b.

OLAP data has less summarization

c.

Both OLAP and data warehouse data have similar summarization levels

d.

None of the above

Discuss
Answer: (a).OLAP data has more summarization Explanation:OLAP data contains several levels of summarization, suggesting more summarization compared to data in the data warehouse.
Q92.
What should be considered when joining tables for OLAP data subsets?

a.

Data redundancy

b.

Department-specific metrics

c.

Uniformity in data structures

d.

The specific needs of the department

Discuss
Answer: (d).The specific needs of the department Explanation:When joining tables for OLAP data subsets, consideration should be given to the specific needs of the department or user group.
Q93.
What are some key considerations for administering and managing the OLAP system?

a.

Expectations on what data will be accessed and how

b.

Selection of the right business dimensions

c.

Choosing the aggregation, summarization, and precalculation

d.

All of the above

Discuss
Answer: (d).All of the above Explanation:Administration considerations for OLAP systems include expectations on data access, selection of business dimensions, and choices related to aggregation and summarization.
Q94.
In the context of the MOLAP model, what is a consideration for moving data into the OLAP system?

a.

Methods and techniques for data movement

b.

Selection of filters for data loading

c.

Development of application programs

d.

Choosing the right business dimensions

Discuss
Answer: (a).Methods and techniques for data movement Explanation:Considerations for moving data into the OLAP system in the MOLAP model include methods and techniques for data movement.
Q95.
What is a corollary of shifting complex queries to the OLAP system?

a.

Increase in data warehouse workload

b.

Decrease in overall query performance

c.

Improved query performance

d.

Slowdown in OLAP system response

Discuss
Answer: (c).Improved query performance Explanation:Shifting complex queries to the OLAP system results in improved overall query performance.
Q96.
How does the presence of an OLAP system affect the workload on the main data warehouse?

a.

Increases the workload

b.

Redistributes the workload

c.

Decreases the workload

d.

Has no impact on the workload

Discuss
Answer: (c).Decreases the workload Explanation:The presence of an OLAP system reduces the workload on the main data warehouse by redistributing some queries to the OLAP system.
Q97.
Why is the load performance of OLAP systems often longer?

a.

OLAP systems are refreshed daily

b.

Load times for precalculating and loading hypercubes are quick

c.

OLAP systems are not refreshed frequently

d.

Refresh intervals are short

Discuss
Answer: (c).OLAP systems are not refreshed frequently Explanation:The load performance of OLAP systems is often longer because loading all possible hypercubes involves time-consuming precalculations, and OLAP systems are not refreshed daily.
Q98.
What is one of the main advantages of multidimensional databases in terms of query response?

a.

Unpredictable response

b.

Slow and inconsistent response

c.

Predictable, fast, and consistent response

d.

High load times for hypercube calculations

Discuss
Answer: (c).Predictable, fast, and consistent response Explanation:Multidimensional databases provide a reasonably predictable, fast, and consistent response to complex queries by precalculating and preaggregating hypercubes.
Q99.
Why are OLAP systems typically not refreshed daily?

a.

Daily refresh results in slow query response

b.

Frequent refreshes lead to unpredictable system behavior

c.

Load times for precalculating hypercubes are exorbitant

d.

Daily refresh is unnecessary for OLAP systems

Discuss
Answer: (c).Load times for precalculating hypercubes are exorbitant Explanation:OLAP systems are typically not refreshed daily because load times for precalculating and loading all possible hypercubes are exorbitant.
Q100.
What is the purpose of precalculations and preaggregations in OLAP systems?

a.

To increase load times

b.

To decrease query performance

c.

To provide a faster response to queries

d.

To reduce the need for refresh intervals

Discuss
Answer: (c).To provide a faster response to queries Explanation:Precalculations and preaggregations in OLAP systems aim to provide a faster response to queries at any level of summarization.
Page 10 of 13

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