Sep-2026 Download Free Latest Exam DS0-001 Certified Sample Questions [Q29-Q46]

DS0-001 CompTIA

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September 24, 2026

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Sep-2026 Download Free Latest Exam DS0-001 Certified Sample Questions

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CompTIA DS0-001 Exam Syllabus Topics:

Topic	Details
Topic 1	Data and Database Security: This topic focuses on data security concepts, governance and regulatory compliance purposes, implementing authentication and authorization policies and best practices. Additionally, the topic discusses database infrastructure security, and understanding types of attacks and their effects on data systems.
Topic 2	Business Continuity: Finally, this topic covers the importance of disaster recovery techniques. Moreover, the topic explains backup and restore best practices and processes.
Topic 3	Database Fundamentals: This topic covers database structure types, SQL code development and modification based on scenarios, comparison of scripting methods and environments, and the impact of programming on database operations.
Topic 4	Database Deployment: In this topic, you’ll find discussions on database planning and design aspects. It also focuses on the implementation, testing, and deployment phases of databases.
Topic 5	Database Management and Maintenance: Here, you’ll learn about monitoring and reporting for database management and performance, common database maintenance processes, documentation production, and relevant tools usage. Lastly, the topic focuses on implementing data management tasks.

QUESTION 29
A database’s daily backup failed. Previous backups were completed successfully. Which of the following should the database administrator examine first to troubleshoot the issue?

CPU usage

Disk space

Event log

OS performance

The first thing that the database administrator should examine to troubleshoot the issue is the event log. The event log is a file that records the events and activities that occur on a system, such as database backups, errors, warnings, or failures. By examining the event log, the administrator can identify the cause and time of the backup failure, and also check for any other issues or anomalies that may affect the backup process or the backup quality. The other options are either not relevant or not the first priority for this task. For example, CPU usage, disk space, and OS performance may affect the performance or availability of the system, but not necessarily cause the backup failure; moreover, these factors can be checked after reviewing the event log for more information. References: CompTIA DataSys+ Course Outline, Domain 5.0 Business Continuity, Objective 5.2 Given a scenario, implement backup and restoration of database management systems.

QUESTION 30
Which of the following concepts applies to situations that require court files to be scanned for permanent reference and original documents be stored for ten years before they can be discarded?

Data loss prevention

Data retention policies

Data classification

Global regulations

The concept that applies to situations that require court files to be scanned for permanent reference and original documents be stored for ten years before they can be discarded is data retention policies. Data retention policies are rules or guidelines that specify how long data should be kept and when it should be deleted or archived. Data retention policies are often based on legal, regulatory, or business requirements, and help organizations manage their data lifecycle, storage, and compliance. The other options are either not related or not specific to this situation. For example, data loss prevention is a process that aims to prevent data from being leaked, stolen, or corrupted; data classification is a process that assigns labels or categories to data based on its sensitivity, value, or risk; global regulations are laws or standards that apply to data across different countries or regions. References: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.1 Given a scenario, apply security principles and best practices for databases.

QUESTION 31
A database administrator wants to remove inactive customers from a database. Which of the following statements should the administrator use?

The statement that the administrator should use to remove inactive customers from a database is option A. This statement uses the DELETE command to delete all the rows from the customer table where the status column is equal to ‘inactive’. The other options either have syntax errors, use incorrect commands, or do not specify the condition correctly.

QUESTION 32
(A financial institution is running a database that contains PII. Database administrators need to provide table access to junior developers. Which of the following is the best option?)

Role assignment

Data masking

View creation

Policy enforcement

The correct answer is C. View creation. CompTIA DataSys+ places strong emphasis on protecting personally identifiable information (PII) while still enabling developers and analysts to perform their required tasks. In environments such as financial institutions, direct access to tables containing sensitive data presents a significant security and compliance risk, especially for junior developers who do not require full visibility of production data.
Creating views is a best-practice solution that allows database administrators to expose only the necessary columns and rows while hiding or excluding sensitive fields such as Social Security numbers, account numbers, or personal contact details. Views act as a controlled abstraction layer over the underlying tables, enabling developers to work with realistic data structures without direct access to raw PII. DataSys+ highlights views as an effective method for enforcing the principle of least privilege while maintaining usability and performance.
Option A, role assignment, is important for access control but is too broad on its own. Assigning a role may still allow access to sensitive columns unless combined with views or column-level permissions. Option B, data masking, is often used for non-production environments or dynamic data protection, but it may not be the best solution when developers need structured access to table data for development or testing purposes.
Option D, policy enforcement, refers to governance and administrative controls but does not directly provide a technical mechanism for safe table access.
CompTIA DataSys+ stresses that database security should balance protection with operational efficiency.
Views allow DBAs to centrally manage what data is exposed, simplify auditing, and reduce the risk of accidental data leakage. They are especially valuable in regulated industries where compliance and data minimization are critical.
Therefore, the best option for providing junior developers with access while protecting PII is view creation, making option C the correct and fully verified answer.

QUESTION 33
A database administrator set up a connection for a SQL Server instance for a new user, but the administrator is unable to connect using the user’s workstation. Which of the following is the most likely cause of the issue?

The SQL Server codes are performing badly.

The SQL Server has not been tested properly.

The SQL Server ports to the main machine are closed.

The SQL Server has many concurrent users.

The most likely cause of the issue is that the SQL Server ports to the main machine are closed. SQL Server uses TCP/IP ports to communicate with clients and other servers. If these ports are blocked by a firewall or other network device, the connection will fail. The administrator should check the port configuration on both the server and the user’s workstation, and make sure that they are open and match the expected values. The other options are either unlikely or unrelated to the issue. For example, the SQL Server codes performing badly or having many concurrent users may affect the performance or availability of the server, but not prevent the connection entirely; the SQL Server not being tested properly may cause errors or bugs in the functionality or security of the server, but not affect the connection unless there is a configuration problem. Reference: CompTIA DataSys+ Course Outline, Domain 2.0 Database Deployment, Objective 2.3 Given a scenario, troubleshoot common database deployment issues.

QUESTION 34
Which of the following database structures is a type of NoSQL database?

Hierarchical

Key-value stores

Cloud

Object-oriented

The database structure that is a type of NoSQL database is key-value stores. Key-value stores are databases that store and manage data as pairs of keys and values. Keys are unique identifiers that locate data in the database; values are arbitrary data that can be any type or format. Key-value stores do not use any schema or structure to organize data, but rather use hash tables or indexes to enable fast and simple access to data based on keys. Key-value stores are suitable for storing large amounts of simple or unstructured data that do not require complex queries or relationships. The other options are either different types of databases or not related to database structures at all. For example, hierarchical databases are databases that store and manage data as nodes in a tree-like structure; cloud databases are databases that are hosted and accessed over the internet using cloud computing services; object-oriented databases are databases that store and manage data as objects that have attributes and methods. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.1 Given a scenario, identify common database types.

QUESTION 35
A company’s backup plan includes only running full backups for its small database. Which of the following frequencies would be most appropriate in this situation?

Daily

Monthly

Weekly

Quarterly

QUESTION 36
A DBA left the company, and the DBA’s account was removed from the system. Soon after, scheduled jobs began failing.
Which of the following would have most likely prevented this issue?

Load balancing

Business continuity plan

Service accounts

Assigning a data steward

The most likely way to prevent this issue is to use service accounts. Service accounts are special accounts that are used by applications or services to perform tasks or run jobs on behalf of users. Service accounts have limited permissions and access rights that are tailored to their specific functions. By using service accounts, the DBA can ensure that scheduled jobs can run independently of individual user accounts, and avoid failures due to account removal or changes. The other options are either not related or not effective for this issue. For example, load balancing is a technique that distributes the workload across multiple servers or resources to improve performance and availability; business continuity plan is a plan that outlines how an organization will continue its operations in the event of a disaster or disruption; assigning a data steward is a process that designates a person who is responsible for ensuring the quality and governance of data. Reference: CompTIA DataSys+ Course Outline, Domain 3.0 Database Management and Maintenance, Objective 3.3 Given a scenario, migrate data between databases.

QUESTION 37
A data scientist recently joined a company and needs to review the data before building models.
Which of the following tools can the data scientist use to find the most extensive details?

Maintenance documentation

Unified modeling language

Entity relationship diagram

Data dictionary

A data dictionary provides detailed metadata about data elements, including definitions, formats, and relationships, helping the data scientist understand the dataset comprehensively.

QUESTION 38
A database administrator needs to remove a redundant customer table from a database in order to streamline periodic reports. Which of the following commands is best for this task?

DELETE TABLE CUSTOMER

UPDATE TABLE CUSTOMER

REMOVE TABLE CUSTOMER

DROP TABLE CUSTOMER

The DROP TABLE command permanently removes the entire customer table and its data from the database, streamlining reports and eliminating redundancy.

QUESTION 39
Which of the following NoSQL database types best categorizes MongoDB?

Document

Column-oriented

Graph

Key-value stores

The NoSQL database type that best categorizes MongoDB is document. Document databases are databases that store and manage data as documents, which are collections of fields and values in formats such as JSON (JavaScript Object Notation) or XML (Extensible Markup Language). Document databases do not use any schema or structure to organize data, but rather use identifiers or indexes to enable flexible and dynamic access to data based on fields or values.
Document databases are suitable for storing large amounts of complex or unstructured data that have variable attributes or nested structures. MongoDB is an example of a document database that uses JSON-like documents to store and query data. The other options are either different types of NoSQL databases or not related to NoSQL databases at all. For example, column- oriented databases are databases that store and manage data as columns rather than rows; graph databases are databases that store and manage data as nodes and edges that represent entities and relationships; key-value stores are databases that store and manage data as pairs of keys and values.

QUESTION 40
A database administrator needs a tool to document and explain the relationships between data in an organization’s database. Which of the following is the best tool to accomplish this task?

Text editor

UML editor

Word processor

SQL query

The best tool for the database administrator to document and explain the relationships between data in an organization’s database is a UML editor. A UML editor is a software application that allows users to create, edit, and visualize diagrams using the Unified Modeling Language (UML). UML is a standard language for modeling software systems and their components, such as classes, objects, relationships, behaviors, etc. UML can also be used to document and explain the relationships between data in an organization’s database by creating entity relationship diagrams (ERDs), which are graphical representations of the entities (tables), attributes (columns), and relationships (constraints) in a database. A UML editor can help the administrator to document and explain the relationships between data by providing features such as drag-and-drop, templates, symbols, validation, etc. The other options are either not suitable or not optimal for this task. For example, a text editor is a software application that allows users to create and edit plain text files; a word processor is a software application that allows users to create and edit text documents; an SQL query is a statement that performs an operation on a database using Structured Query Language (SQL). References: CompTIA DataSys+ Course Outline, Domain 2.0 Database Deployment, Objective 2.2 Given a scenario, create database objects using scripting and programming languages.

QUESTION 41
Which of the following is an attack in which an attacker hopes to profit from locking the database software?

Spear phishing

Ransomware

SQL injection

On-path

The attack in which an attacker hopes to profit from locking the database software is ransomware. Ransomware is a type of malware that encrypts the data or files on a system or network and demands a ransom from the victim to restore them. Ransomware can target database software and lock its access or functionality until the victim pays the ransom, usually in cryptocurrency. Ransomware can cause serious damage and loss to the victim, as well as expose them to further risks or threats. Ransomware can be delivered through various methods, such as phishing emails, malicious attachments, compromised websites, etc. The other options are either different types of attacks or not related to locking database software at all. For example, spear phishing is a type of phishing attack that targets a specific individual or organization with personalized or customized emails; SQL injection is a type of attack that inserts malicious SQL statements into an input field or parameter of a web application to manipulate or compromise the underlying database; on-path is a type of attack that intercepts and modifies the data in transit between two parties on a network. Reference: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.4 Given a scenario, identify common types of attacks against databases

QUESTION 42
A database administrator wants to create a database that does not have a predefined schema.
Which of the following tools should the administrator use to create this type of database?
(Choose two.)

PostgreSQL

MariaDB

MySQL

SQL Server

MongoDB

Cosmos

QUESTION 43
A database administrator needs to ensure continuous availability of a database in case the server fails. Which of the following should the administrator implement to ensure high availability of the database?

ETL

Replication

Database dumping

Backup and restore

The option that the administrator should implement to ensure high availability of the database is replication.
Replication is a process that copies and synchronizes data from one database server (the primary or source) to one or more database servers (the secondary or target). Replication helps ensure high availability of the database by providing redundancy, fault tolerance, and load balancing. If the primary server fails, the secondary server can take over and continue to serve the data without interruption or data loss. The other options are either not related or not suitable for this purpose. For example, ETL is a process that extracts, transforms, and loads data from one source to another for analysis or reporting purposes; database dumping is a process that exports the entire content of a database to a file for backup or migration purposes; backup and restore is a process that copies and recovers data from a backup device or media in case of a disaster or corruption. References: CompTIA DataSys+ Course Outline, Domain 5.0 Business Continuity, Objective 5.3 Given a scenario, implement replication of database management systems.

QUESTION 44
Which of the following is a reason to create a stored procedure?

To minimize storage space

To improve performance

To bypass case sensitivity requirements

To give control of the query logic to the user

A reason to create a stored procedure is to improve performance. A stored procedure is a set of SQL statements or commands that are stored and compiled in the database server, and can be executed by name or by a trigger. A stored procedure can improve performance by reducing the network traffic between the client and the server, as only the name or the parameters of the stored procedure need to be sent, rather than the entire SQL code. A stored procedure can also improve performance by reusing the same execution plan, as the stored procedure is compiled only once and cached in the server memory. The other options are either not true or not relevant for this purpose. For example, a stored procedure does not necessarily minimize storage space, as it still occupies space in the database server; a stored procedure does not bypass case sensitivity requirements, as it still follows the rules of the database system; a stored procedure does not give control of the query logic to the user, as it is defined and maintained by the database administrator or developer. Reference: CompTIA DataSys+ Course Outline, Domain 2.0 Database Deployment, Objective 2.2 Given a scenario, create database objects using scripting and programming languages.

QUESTION 45
Which of the following cloud delivery models provides users with the highest level of flexibility regarding resource provisioning and administration?

DBaaS

IaaS

SaaS

PaaS

The cloud delivery model that provides users with the highest level of flexibility regarding resource provisioning and administration is IaaS. IaaS, or Infrastructure as a Service, is a cloud delivery model that provides users with access to virtualized computing resources, such as servers, storage, network, and operating systems, over the internet. Users can provision, configure, and manage these resources according to their needs and preferences, without having to worry about the maintenance or security of the physical infrastructure. IaaS offers users the most control and customization over their cloud environment, as well as the ability to scale up or down as needed. The other options are either different cloud delivery models or not related to cloud computing at all. For example, DBaaS, or Database as a Service, is a cloud delivery model that provides users with access to database management systems and tools over the internet; SaaS, or Software as a Service, is a cloud delivery model that provides users with access to software applications and services over the internet; PaaS, or Platform as a Service, is a cloud delivery model that provides users with access to development platforms and tools over the internet.

QUESTION 46
(A company’s database was hacked. A security officer conducted an audit and discovered that an attacker used a rainbow table to break into one of the user accounts to access the database. Which of the following is the best immediate response to this attack?)

Security and awareness training

Implementation of security policies and procedures

Strong passwords

Password hash salting

The correct answer is D. Password hash salting. According to CompTIA DataSys+ objectives, rainbow table attacks specifically target hashed passwords by using precomputed hash values to quickly reverse weak or unsalted hashes back into their original plaintext passwords. If an attacker successfully used a rainbow table, it strongly indicates that the database stored password hashes without proper salting or used weak hashing algorithms.
Password salting is a defensive technique where a unique random value (the salt) is added to each password before hashing. This ensures that even if two users have the same password, their resulting hashes are different. More importantly, salting renders rainbow tables ineffective because the attacker would need to generate a separate rainbow table for every possible salt value, which is computationally impractical.
DataSys+ highlights salting as a critical immediate control to protect stored credentials once a password compromise is identified.
Option C, strong passwords, is a preventative control but not the best immediate response. Even strong passwords can be compromised if hashes are unsalted and exposed. Option A, security and awareness training, addresses user behavior but does not mitigate the technical weakness exploited in this attack. Option B, implementing security policies and procedures, is important for long-term governance but does not directly stop rainbow table attacks against existing password hashes.
CompTIA DataSys+ emphasizes that when credential storage mechanisms are compromised, administrators must prioritize cryptographic protections at the database level. This includes salting, using strong hashing algorithms, and forcing credential resets. Among the options provided, password hash salting is the most direct and effective response to prevent the same attack vector from succeeding again.
Therefore, the best immediate response is D. Password hash salting, making it the verified and correct answer aligned with CompTIA DataSys+ guidance.

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