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Exam 14: Big Data and Nosql

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Question 31

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​When using MapReduce, a _______ function takes a collection and data and sorts and filters it into a set of key-value pairs.

A) ​reduce
B) ​map
C) ​data
D) ​block

E) B) and D)
F) All of the above

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Question 32

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______databases simply store data with no attempt to understand the contents of the value component or its meaning.

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Question 33

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A reduce function takes a collection of key-value pairs with the same key value and summarizes them into a single result.

​​​Under the HDFS system, using a write-one, ready-many model simplifies concurrency issues.

______ ​refers to traditional, relational database technologies that use column-centric, not row-centric storage.

When using a HDFS, a heartbeat is sent every ______ to notify the name node that the data mode is still available.

When using MapReduce,best practices suggest that the number of mappers on a given node should be ______.

​______ isthe coexistence of a variety of data storage and data management technologies within an organization's infrastructure.

Hive is a good choice for jobs that require a small subset of data to be returned very quickly.​

Define the four key assumptions of the Hadoop Distributed File System (HDFS).

Which of the following is NOT one of the standard NoSQL categories?

Which of the following is NOT a key assumption of the Hadoop Distributed File System?

​A(n) ______ is a process or set of operations in a calculation.

Graph theory is a mathematical and computer science field that models relationships, or edges, between objects called ______.

______ is keeping the same number of systems, but migrating each system to a larger system.

_____ are like attributes; they are the data that we need to store about the node.

Modeling and storing data about relationships is the focus of ______ databases.

______ is used to extract knowledge from sources of data-NoSQL databases, Hadoop data stores, and data warehouses-to provide decision support to all organizational users.

Discuss the 3 Vs of Big Data. How has the definition of Big Data regarding these items changed over time?

Key-value and document databases are structurally similar.