CompTIA DS0-001 Online Practice Questions and Exam Preparation

CompTIA DS0-001 Online Questions & Answers

• Question 31:

  A database administrator would like for users to be able to access resources remotely from home. Which of the following best describes how the administrator can enable this access without compromising the security of the stored data?

  A. Implement a virtual private network.
  B. Implement strong passwords polices.
  C. Configure and deploy a firewall.
  D. Implement a parameter network for internet-facing database applications.
  A. Implement a virtual private network.

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  Explanation/Reference:

• Question 32:

  Which of the following commands when executed will rebuild statistics against user-defined tables in a database?

  A. sp_autostats
  B. sp_updatestats
  C. DBCC UPDATEUSAGE
  D. DBCC SHOW_STATISTICS
  B. sp_updatestats

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  Explanation/Reference:

• Question 33:

  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?

  A. Load balancing
  B. Business continuity plan
  C. Service accounts
  D. Assigning a data steward
  C. Service accounts

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  Explanation/Reference:

  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. References: CompTIA DataSys+ Course Outline, Domain 3.0 Database Management and Maintenance, Objective 3.3 Given a scenario, migrate data between databases.

• Question 34:

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

  A. Spear phishing
  B. Ransomware
  C. SQL injection
  D. On-path
  B. Ransomware

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  Explanation/Reference:

  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. References: 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 35:

  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. IINTERSECT
  D. CROSS JOIN
  A. UNION

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  Explanation/Reference:

  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. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.2 Given a scenario, execute

  database tasks using scripting and programming languages.

• Question 36:

  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?

  A. Data loss prevention
  B. Data retention policies
  C. Data classification
  D. Global regulations
  B. Data retention policies

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  Explanation/Reference:

  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 37:

  A database administrator would like to extract a sales performance report from more than one database instance. Which of the following keywords should the database administrator use?

  A. UNION ON
  B. UNION AND
  C. JOIN ON
  D. WITH
  C. JOIN ON

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  Explanation/Reference:

• Question 38:

  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 thebestaction for the administrator to take?

  A. Create a stored procedure.
  B. Create a view.
  C. Create a csv export.
  D. Create a trigger.
  B. Create a view.

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  Explanation/Reference:

  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.

• Question 39:

  Which of the following statements contains an error?

  A. Select EmpId from employee where EmpId=90030
  B. Select EmpId where EmpId=90030 and DeptId=34
  C. Select* from employee where EmpId=90030
  D. Select EmpId from employee
  B. Select EmpId where EmpId=90030 and DeptId=34

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  Explanation/Reference:

  The statement that contains an error is option B. This statement is missing the FROM clause, which specifies the table or tables from which to retrieve data. The FROM clause is a mandatory clause in a SELECT statement, unless the

  statement uses a subquery or a set operator. The correct syntax for option B would be:

  SELECT EmpId FROM employee WHERE EmpId=90030 AND DeptId=34 Copy

  The other options are either correct or valid SQL statements. For example, option A selects the employee ID from the employee table where the employee ID is equal to 90030; option C selects all columns from the employee table where the

  employee ID is equal to 90030; option D selects the employee ID from the employee table without any filter condition. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.2 Given a scenario,

  execute database tasks using scripting and programming languages.

• Question 40:

  Which of the following is a characteristic of all non-relational databases?

  A. Columns with the same data type
  B. Unstructured data
  C. Logical record groupings
  D. Tabular schema
  B. Unstructured data

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  Explanation/Reference:

  The characteristic of all non-relational databases is unstructured data. Unstructured data is data that does not have a predefined or fixed format, schema, or structure. Unstructured data can include various types of data, such as text, images, audio, video, etc. Non-relational databases, also known as NoSQL databases, are databases that store and manage unstructured data using different models, such as key-value, document, graph, columnar, etc. Non-relational databases are suitable for handling large volumes, variety, and velocity of data that do not fit well in the relational model. The other options are either characteristics of relational databases or not related to database types at all. For example, columns with the same data type, logical record groupings, and tabular schema are characteristics of relational databases, which are databases that store and manage structured data using tables, rows, columns, and constraints. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.1 Given a scenario, identify common database types.