[2026] Pass CompTIA DS0-001 Test Practice Test Questions Exam Dumps
Verified DS0-001 dumps Q&As - DS0-001 dumps with Correct Answers
NEW QUESTION # 17
A database administrator needs to ensure database backups are occurring on a daily basis and at scheduled times. Which of the following actions should the administrator take?
- A. Review the server logs for entries.
- B. Query the database to observe entries.
- C. Review the backup media.
- D. Check the database schema.
Answer: A
Explanation:
The action that the administrator should take is to review the server logs for entries. Server logs are files that record the events and activities that occur on a server, such as database backups, errors, warnings, or failures. By reviewing the server logs, the administrator can verify that the database backups are occurring on a daily basis and at scheduled times, and also identify any issues or anomalies that may affect the backup process or the backup quality. The other options are either not relevant or not sufficient for this task. For example, querying the database to observe entries may not show the backup status or frequency, checking the database schema may not reflect the backup schedule or policy, and reviewing the backup media may not indicate the backup time or duration. Reference: CompTIA DataSys+ Course Outline, Domain 5.0 Business Continuity, Objective 5.2 Given a scenario, implement backup and restoration of database management systems.
NEW QUESTION # 18
Which of the following types of RAID, if configured with the same number and type of disks, would provide the best write performance?
- A. RAID 3
- B. RAID 6
- C. RAID 5
- D. RAID 10
Answer: D
Explanation:
The type of RAID that would provide the best write performance if configured with the same number and type of disks is RAID 10. RAID 10, or RAID 1+0, is a type of RAID that combines mirroring and striping techniques to provide both redundancy and performance. Mirroring means that data is duplicated across two or more disks to provide fault tolerance and data protection. Striping means that data is split into blocks and distributed across two or more disks to provide faster access and throughput. RAID 10 requires at least four disks and can tolerate the failure of up to half of the disks without losing data. RAID 10 provides the best write performance among the RAID types because it can write data in parallel to multiple disks without parity calculations or overhead. The other options are either different types of RAID or not related to RAID at all.
For example, RAID 3 is a type of RAID that uses striping with a dedicated parity disk to provide redundancy and performance; RAID 5 is a type of RAID that uses striping with distributed parity to provide redundancy and performance; RAID 6 is a type of RAID that uses striping with double distributed parity to provide extra redundancy and performance. References: CompTIA DataSys+ Course Outline, Domain 3.0 Database Management and Maintenance, Objective 3.1 Given a scenario, perform common database maintenance tasks.
NEW QUESTION # 19
An on-premises application server connects to a database in the cloud. Which of the following must be considered to ensure data integrity during transmission?
- A. Encryption
- B. Masking
- C. Bandwidth
- D. Redundancy
Answer: A
Explanation:
The factor that must be considered to ensure data integrity during transmission is encryption.
Encryption is a process that transforms data into an unreadable or scrambled form using an algorithm and a key. Encryption helps protect data integrity during transmission by preventing unauthorized access or modification of data by third parties, such as hackers, eavesdroppers, or interceptors. Encryption also helps verify the identity and authenticity of the source and destination of the data using digital signatures or certificates. The other options are either not related or not sufficient for this purpose. For example, bandwidth is the amount of data that can be transmitted over a network in a given time; redundancy is the duplication of data or components to provide backup or alternative sources in case of failure; masking is a technique that replaces sensitive data with fictitious but realistic data to protect its confidentiality or compliance.
NEW QUESTION # 20
A database administrator is creating a table, which will contain customer data, for an online business. Which of the following SQL syntaxes should the administrator use to create an object?
- A.
- B.
- C.
- D.
Answer: A
Explanation:
The SQL syntax that the administrator should use to create an object is option B. This syntax uses the CREATE TABLE statement to define a new table named customer with four columns: customer_id, name, email, and phone. Each column has a data type and a constraint, such as NOT NULL or PRIMARY KEY. The other options either have syntax errors, use incorrect keywords, or do not specify the table name or columns correctly. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.1 Given a scenario, identify and apply database structure types.
NEW QUESTION # 21
Which of the following is used to document the system catalog in a database?
- A. Project plan
- B. Standard operating procedure
- C. System requirements documentation
- D. Data dictionary
Answer: D
Explanation:
A data dictionary documents the system catalog by providing metadata about database objects, their structure, and relationships within the database.
NEW QUESTION # 22
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?
- A. Replication
- B. ETL
- C. Database dumping
- D. Backup and restore
Answer: A
Explanation:
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. Reference: CompTIA DataSys+ Course Outline, Domain 5.0 Business Continuity, Objective 5.3 Given a scenario, implement replication of database management systems.
NEW QUESTION # 23
Which of the following transaction isolation levels allows dirty reads?
- A. Snapshot
- B. Serializable
- C. Read uncommitted
- D. Read committed
- E. Repeatable read
Answer: C
Explanation:
The Read Uncommitted isolation level allows dirty reads, meaning transactions can read data that has been modified but not yet committed by other transactions.
NEW QUESTION # 24
A database administrator is migrating the information in a legacy table to a newer table. Both tables contain the same columns, and some of the data may overlap.
Which of the following SQL commands should the administrator use to ensure that records from the two tables are not duplicated?
- A. UNION
- B. JOIN
- C. CROSS JOIN
- D. IINTERSECT
Answer: A
Explanation:
The SQL command that the administrator should use to ensure that records from the two tables are not duplicated is option A. This command uses the UNION clause to combine the records from the legacy table and the newer table into a single result set. The UNION clause also eliminates any duplicate records that may exist in both tables, and sorts the result by default. The other options either do not produce the desired result or have syntax errors. For example, option B would join the records from the two tables based on a common column, but not remove any duplicates; option C would return only the records that are common to both tables, but not the ones that are unique to each table; option D would produce a Cartesian product of the records from the two tables, which would increase the number of duplicates. Reference: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.2 Given a scenario, execute database tasks using scripting and programming languages.
NEW QUESTION # 25
A database administrator needs to provide access to data from two different tables to multiple group users in order to facilitate ongoing reporting. However, some columns in each table are restricted, and users should not be able to see the values in these columns.
Which of the following is the best action for the administrator to take?
- A. Create a trigger.
- B. Create a csv export.
- C. Create a view.
- D. Create a stored procedure.
Answer: C
Explanation:
The best action for the administrator to take is to create a view. A view is a virtual table that shows a subset of data from one or more tables. The administrator can use a view to provide access to data from two different tables to multiple group users without exposing the restricted columns. The view can also simplify the queries and improve the performance of the reporting process. The other options are either not suitable for this scenario or do not address the requirement of hiding some columns from users. For example, creating a stored procedure would require additional coding and execution, creating a csv export would create a static file that may not reflect the latest data changes, and creating a trigger would perform an action in response to an event rather than provide access to data. References: CompTIA DataSys+ Course Outline, Domain 2.0 Database Deployment, Objective 2.2 Given a scenario, create database objects using scripting and programming languages.
NEW QUESTION # 26
Which of the following statements is TRUNCATEan example of?
- A. MCL statement
- B. DCL statement
- C. DDL statement
- D. DML statement
Answer: C
Explanation:
TRUNCATE is a Data Definition Language (DDL) statement because it modifies the structure of the table by quickly removing all rows without logging individual row deletions.
NEW QUESTION # 27
A new retail store employee needs to be able to authenticate to a database. Which of the following commands should a database administrator use for this task?
- A. INSERT USER
- B. ALLOW USER
- C. CREATE USER
- D. ALTER USER
Answer: C
Explanation:
The command that the database administrator should use for this task is CREATE USER. The CREATE USER command is a SQL statement that creates a new user account in a database and assigns it a username and a password. The CREATE USER command also allows the database administrator to specify other options or attributes for the user account, such as default tablespace, quota, profile, role, etc. The CREATE USER command is the first step to enable a user to authenticate to a database. The other options are either invalid or not suitable for this task. For example, INSERT USER is not a valid SQL command; ALLOW USER is not a SQL command, but a keyword used in some database systems to grant permissions to users; ALTER USER is a SQL command that modifies an existing user account, but does not create a new one. References: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.
NEW QUESTION # 28
Which of the following scripts would set the database recovery model for sys.database?
- A.
- B.
- C.
- D.
Answer: C
Explanation:
The script that would set the database recovery model for sys.database is option A. This script uses the ALTER DATABASE statement to modify the recovery model of the sys.database to full with no wait.
The other options either have syntax errors, use incorrect keywords, or do not specify the recovery model correctly. References: CompTIA DataSys+ Course Outline, Domain 3.0 Database Management and Maintenance, Objective 3.1 Given a scenario, perform common database maintenance tasks.
NEW QUESTION # 29
An account manager, who had employee ID number 0012, resigned from an organization. The account manager's view privileges need to be removed from the customer table. Which of the following commands would be the best option for the organization's database administrator to use to accomplish this task?
REVOKE SELECT
- A. DROP SELECT
FROM '0012' - B. ON tblCustomer
FROM '0012'
REVOKE UPDATE - C. ON tblCustomer
FROM '0012'
UPDATE TABLE tblCustomer - D. ON tblCustomer
FROM '0012'
REVOKE DELETE
Answer: D
Explanation:
The REVOKE SELECT command removes the user's (employee ID 0012) privilege to view (SELECT) data in the customer table, ensuring appropriate access control.
NEW QUESTION # 30
Which of the following computer services associates IP network addresses with text-based names in order to facilitate identification and connectivity?
- A. LDAP
- B. DHCP
- C. IDNS
- D. NTP
Answer: C
Explanation:
The computer service that associates IP network addresses with text-based names in order to facilitate identification and connectivity is IDNS. IDNS, or Internet Domain Name System (DNS), is a service that translates domain names into IP addresses and vice versa. Domain names are human-readable names that identify websites or devices on the internet, such as www.comptia.org or www.google.com. IP addresses are numerical identifiers that locate websites or devices on the internet, such as 104.18.26.46 or 142.250.72.238. IDNS helps users to access websites or devices using domain names instead of IP addresses, which are easier to remember and type. IDNS also helps administrators to manage websites or devices using domain names instead of IP addresses, which are more flexible and scalable. The other options are either different computer services or not related to IP network addresses or text-based names at all. For example, LDAP, or Lightweight Directory Access Protocol, is a service that provides access to directory information such as users, groups, or devices on a network; NTP, or Network Time Protocol, is a service that synchronizes the clocks of computers or devices on a network; DHCP, or Dynamic Host Configuration Protocol, is a service that assigns IP addresses and other network configuration parameters to computers or devices on a network. Reference: CompTIA DataSys+ Course Outline, Domain 2.0 Database Deployment, Objective 2.1 Given a scenario, select an appropriate database deployment method.
NEW QUESTION # 31
A database administrator is migrating the information in a legacy table to a newer table. Both tables contain the same columns, and some of the data may overlap.
Which of the following SQL commands should the administrator use to ensure that records from the two tables are not duplicated?
- A. INTERSECT
- B. UNION
- C. JOIN
- D. CROSS JOIN
Answer: B
Explanation:
The SQL command that the administrator should use to ensure that records from the two tables are not duplicated is option A. This command uses the UNION clause to combine the records from the legacy table and the newer table into a single result set. The UNION clause also eliminates any duplicate records that may exist in both tables, and sorts the result by default. The other options either do not produce the desired result or have syntax errors. For example, option B would join the records from the two tables based on a common column, but not remove any duplicates; option C would return only the records that are common to both tables, but not the ones that are unique to each table; option D would produce a Cartesian product of the records from the two tables, which would increase the number of duplicates.
NEW QUESTION # 32
A business wants to be notified when new clients are added to the client list that is stored in the client table. Which of the following SQL statements should the database administrator use to perform this task?
- A. CREATE TRIGGER
- B. CREATE INDEX
- C. CREATE PROCEDURE
- D. CREATE VIEW
Answer: A
Explanation:
A trigger automatically executes a specified action, such as sending a notification, in response to events like inserting new clients into a table.
NEW QUESTION # 33
Which of the following does a database administrator need to know before planning the setup of a new server for a client?
- A. The connectivity status of the server
- B. The transaction logs for the server
- C. The performance of the server
- D. The size and importance of the server
Answer: D
Explanation:
Knowing the size and importance of the server is crucial for proper planning, as it determines the required resources, configurations, and level of redundancy needed to meet the client's needs.
NEW QUESTION # 34
Which of the following offers a DBA the ability to gather important performance metrics to help optimize SQL queries and parameters for a database instance?
- A. Database monitoring
- B. Database recovery
- C. Database maintenance
- D. Database security
Answer: A
Explanation:
Database monitoring provides performance metrics and insights that help a DBA identify bottlenecks and optimize SQL queries and parameters for better performance.
NEW QUESTION # 35
A database administrator wants to remove inactive customers from a database. Which of the following statements should the administrator use?
- A.
- B.
- C.
- D.
Answer: C
Explanation:
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. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.2 Given a scenario, execute database tasks using scripting and programming languages.
NEW QUESTION # 36
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