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CompTIA Certification
DS0-001 Exam
CompTIA.DS0-001.v2026-02-12.q100 Dumps

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Question 81

Which of the following is used to hide data in a database so the data can only be read by a user who has a key?

A.Data security
B.Data masking
C.Data protection
D.Data encryption

Correct Answer: D

The option that is used to hide data in a database so the data can only be read by a user who has a key is data encryption. Data encryption is a process that transforms data into an unreadable or scrambled form using an algorithm and a key. Data encryption helps protect data from unauthorized access or modification by third parties, such as hackers, eavesdroppers, or interceptors. Data encryption also helps verify the identity and authenticity of the source and destination of the data using digital signatures or certificates. Data encryption can be applied to data at rest (stored in a database) or data in transit (transmitted over a network). To read encrypted data, a user needs to have the corresponding key to decrypt or restore the data to its original form.
The other options are either different concepts or not related to hiding data at all. For example, data security is a broad term that encompasses various methods and techniques to protect data from threats or risks; data masking is a technique that replaces sensitive data with fictitious but realistic data to protect its confidentiality or compliance; data protection is a term that refers to the legal or ethical obligations to safeguard personal or sensitive data from misuse or harm. References: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.

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Question 82

Five minutes after a power failure occurred in a data center, a CO2 system was automatically triggered. Which of the following caused the CO2 system to start?

A.High temperatures activated the fire suppression system.
B.RPO settings were configured to be applied in a short time frame.
C.A cooling system set off the CO2 system in order to protect the equipment.
D.RTO settings were configured to be applied in a short time frame.

Correct Answer: A

CO2 systems are fire suppression mechanisms that are triggered by high temperatures, which can occur after a power failure disables cooling systems and causes equipment to overheat.

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Question 83

Which of the following transaction isolation levels allows dirty reads?

A.Snapshot
B.Repeatable read
C.Serializable
D.Read uncommitted
E.Read committed

Correct Answer: D

The Read Uncommitted isolation level allows dirty reads, meaning transactions can read data that has been modified but not yet committed by other transactions.

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Question 84

A company is launching a proof-of-concept, cloud-based application. One of the requirements is to select a database engine that will allow administrators to perform quick and simple queries on unstructured data.
Which of the following would be best suited for this task?

A.MonogoDB
B.MS SQL
C.Oracle
D.Graph database

Correct Answer: A

The best suited database engine for this task is MongoDB. MongoDB is a type of non-relational database that stores data as documents in JSON-like format. MongoDB allows administrators to perform quick and simple queries on unstructured data, such as text, images, videos, or social media posts, without requiring a predefined schema or complex joins. MongoDB also supports cloud-based deployment, scalability, and high availability. The other options are either relational databases that require a fixed schema and structure for data, or specialized databases that are designed for specific purposes, such as graph databases for storing and analyzing network data. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.1 Given a scenario, identify and apply database structure types.

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Question 85

A database administrator would like to create a table named XYZ. Which of the following queries should the database administrator use to create the table?

A.
B.
C.
D.

Correct Answer: B

The query that the administrator should use to create the table is option B. This query uses the CREATE TABLE statement to define a new table named XYZ with three columns: ID, Name, and Age. Each column has a data type and a constraint, such as NOT NULL, PRIMARY KEY, or CHECK. The other options either have syntax errors, use incorrect keywords, or do not specify the table name or columns correctly. Reference: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.1 Given a scenario, identify and apply database structure types.

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