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NEW QUESTION # 18
A database administrator has been asked to assign a user the ability to view a data set. Which of the following practices best describes this request?
Answer: B
Explanation:
The practice that best describes this request is access control. Access control is a process that regulates who can access what data in a system based on predefined rules or policies. Access control helps protect data from unauthorized or inappropriate access or modification by granting or denying permissions or privileges to users or groups based on their roles or identities. By applying access control, the database administrator can assign a user the ability to view a data set without allowing them to change or delete it. The other options are either different practices or not related to this request. For example, security audit is a process that evaluates the security level of a system by identifying vulnerabilities or risks; database audit is a process that monitors and records the activities or events that occur on a database; password policy implementation is a process that defines and enforces rules or standards for creating and managing passwords. Reference: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.
NEW QUESTION # 19
A database administrator would like to address data inconsistencies, define conventions to be used across the organization, make data easier to analyze, and enforce the use of data standards. Which of the following solutions would best meet the administrator's need?
Answer: D
Explanation:
A data dictionary standardizes definitions and formats, helping enforce data consistency, conventions, and easier analysis across the organization.
NEW QUESTION # 20
A database administrator is concerned about transactions in case the system fails. Which of the following properties addresses this concern?
Answer: D
Explanation:
The property that addresses this concern is durability. Durability is one of the four properties (ACID) that ensure reliable transactions in a database system. Durability means that once a transaction has been committed, its effects are permanent and will not be lost in case of system failure, power outage, crash, etc. Durability can be achieved by using techniques such as write-ahead logging, checkpoints, backup and recovery, etc. The other options are either not related or not specific to this concern. For example, isolation means that concurrent transactions do not interfere with each other and produce consistent results; atomicity means that a transaction is either executed as a whole or not at all; consistency means that a transaction preserves the validity and integrity of the data. Reference: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.3 Given a scenario, identify common database issues.
NEW QUESTION # 21
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
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 # 22
Which of the following types of RAID, if configured with the same number and type of disks, would provide the best write performance?
Answer: C
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 # 23
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