Question 1

A ____ runs Bitcoin software that verifies (using a hash function)that the blockchain has not been altered in any way since the previous transaction, and for this service, the miner is rewarded with new bitcoins.

Accepted Answer

A Bitcoin miner runs Bitcoin software to verify transactions on the blockchain using a hash function. They are rewarded with new bitcoins for this service, ensuring the integrity and security of the blockchain.

Question 2

Each category of information in a database is called a(n)____.

Accepted Answer

An attribute refers to a category of information in a database, representing a property or characteristic of an entity or object.

Question 3

Related records are kept in a _________.

Accepted Answer

Related records are kept in a data file. A data file is a collection of related records.

Question 4

A database management system can relate information between various tables through ____ values.

Accepted Answer

Key values are used in database management systems to establish relationships between different tables, allowing for the association and retrieval of related data across those tables.

Question 5

The term __________ expresses that we now have huge amounts of data available.

Accepted Answer

The term "big data" is used to express the concept of having vast amounts of data available, highlighting the challenges and opportunities in processing, analyzing, and extracting value from very large datasets.

Question 6

____________________ is an online payment service, an alternative to a customer paying an online merchant by credit card.

Accepted Answer

The answer of ____________________ is an online payment service, an...

Question 7

In general, issues of personal privacy and public safety are magnified enormously by the capabilities of ____________________ databases.

Accepted Answer

The answer of In general, issues of personal privacy and...

Question 8

A(n)____________________ is a graphical ad, often with animation, placed in a prominent position on a webpage.

Accepted Answer

The answer of A(n)____________________ is a graphical ad, often with...

Question 9

____ allow the physical data to reside at separate and independent locations that are electronically networked together.

Accepted Answer

Distributed databases are designed to allow the storage of data across multiple physical locations, yet these locations are interconnected through a network, enabling the system to operate as a single database from the user's perspective.

Question 10

A ____ is an attribute or combination of attributes that uniquely identifies a tuple.

Accepted Answer

A primary key is an attribute or a combination of attributes that uniquely identifies a tuple in a relation. It ensures that no two rows have the same value in the primary key column(s) and that a primary key value cannot be NULL.

Question 11

Services such as Apple Pay and PayPal are examples of __________.

Accepted Answer

These services are electronic payment systems because they allow users to make transactions digitally without the need for physical cash or checks.

Question 12

As of April 2017, ____ had almost 169 million active registered users, and there were over 800 million listings of items for sale.

Accepted Answer

eBay is the correct answer because it is a well-known online auction and shopping website that allows people and businesses to buy and sell a wide variety of goods and services worldwide. The numbers mentioned match eBay's user and listing statistics around that time frame.

Question 13

A ____ is a collection of databases that contain current and archived data used for research and analysis purposes rather than to manage day-to-day business transactions such as inventory control or payroll data.

Accepted Answer

A data warehouse is specifically designed to store large amounts of data for query and analysis purposes, rather than for the processing of transactional business operations.

Question 14

Using multiple ____________________ in a single database minimizes the amount of work required to maintain consistency in the data.

Accepted Answer

The answer of Using multiple ____________________ in a single database...

Question 15

__________ is the basis of Bitcoin cybercurrency.

Accepted Answer

Blockchain technology is the foundation of Bitcoin, providing a decentralized ledger that records all transactions across a network.

Question 16

A good DBMS incorporates the services of a ____ to organize the disk files in an optimal way, in order to minimize access time to the records.

Accepted Answer

A sophisticated file manager is part of a good DBMS to efficiently organize disk files, aiming to reduce the time it takes to access records.

Question 17

A ____ gives the user, or the user's application software, the ability to combine and manipulate data easily in ways that would be very difficult if the data were kept in separate and unrelated files.

Accepted Answer

A database is designed to allow users or their applications to combine and manipulate data easily, unlike separate and unrelated files which would make such tasks difficult.

Question 18

A program written in ____________________ asks for something to be done, but it does not contain a specific sequence of instructions on how it is to be done.

Accepted Answer

The answer of A program written in ____________________ asks for...

Question 19

A ____ is one where multiple keys are needed to identify a tuple uniquely.

Accepted Answer

A composite primary key is formed by combining two or more columns in a table to create a unique identifier for each record. This is necessary when a single column is not enough to uniquely identify a record.

Question 20

____ is the process of automatically analyzing large amounts of data to discover and interpret previously hidden patterns contained therein.

Accepted Answer

Data mining is the computational process of discovering patterns in large data sets involving methods at the intersection of machine learning, statistics, and database systems. It's aimed at extracting information from a data set and transforming it into an understandable structure for further use.

Quiz 14: Ecommerce, Databases, and Data Science

A ____ runs Bitcoin software that verifies (using a hash function) that the blockchain has not been altered in any way since the previous transaction, and for this service, the miner is rewarded with new bitcoins.

Each category of information in a database is called a(n) ____.