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| Section | Weight | Objectives |
|---|---|---|
| Database Deployment & Planning | 19% | - Replication Strategies - Database Clustering - High Availability Architecture - Database Server Requirements - Disaster Recovery Planning - Capacity Planning |
| Data Analytics & Engineering | 19% | - ETL Processes - Data Quality - Data Warehousing Concepts - Data Visualization Basics - Reporting Concepts - Data Governance |
| Database Fundamentals | 20% | - Data Models (Relational, NoSQL, etc.) - ACID Properties - CAP Theorem - Database Concepts and Architecture - Database Design Principles - Data Normalization |
| Database Support, Maintenance & Optimization | 20% | - Index Management - Performance Monitoring - Backup and Recovery Procedures - Query Optimization - Patch Management - Database Security (Users, Roles, Permissions) |
| Database Implementation | 22% | - Data Types and Constraints - Stored Procedures and Functions - Triggers - Database Objects (Tables, Views, Indexes) - Data Import/Export - SQL DDL Statements |
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問題 #94
A server administrator wants to analyze a database server's disk throughput. Which of the following should the administrator measure?
答案：C
解題說明：
The factor that the administrator should measure to analyze a database server's disk throughput is IOPS.
IOPS, or Input/Output Operations Per Second, is a metric that measures the number of read and write operations that a disk can perform in one second. IOPS indicates the performance or speed of a disk and how well it can handle multiple requests or transactions. Higher IOPS means higher disk throughput and lower latency. IOPS can be affected by various factors, such as disk type, size, speed, cache, RAID level, etc. The other options are either not related or not sufficient for this purpose. For example, RPfvl is not a valid acronym or metric; latency is the time delay between a request and a response; reads are the number of read operations performed by a disk. References: CompTIA DataSys+ Course Outline, Domain 3.0 Database Management and Maintenance, Objective 3.2 Given a scenario, monitor database performance.
問題 #95
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?
答案：A
解題說明：
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. Reference: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.
問題 #96
A database administrator must grant a manager access to all employee data but only grant employees access to their own information. Which of the following would best enable this requirement?
答案：B
解題說明：
Row-based access control restricts users' access to specific rows in a database, allowing the manager to see all employee data while ensuring each employee can only access their own information.
問題 #97
A database administrator manages a database server that is running low on disk space. A lot of backup files are stored on the server's disks.
Which of the following is the best action for the administrator to take?
答案：B
解題說明：
The best action for the administrator to take is to delete all the backup files that are not required by the backup retention policy. This will free up disk space on the server and also comply with the best practices for data backup and recovery. The backup retention policy defines how long the backup files should be kept and when they should be deleted or archived. The other options are either risky, inefficient, or impractical. For example, moving all the backup files to external disks would require additional hardware and time, deleting all the backup files containing data that is rated as classified would compromise data security and compliance, and deleting all the backup files except for the most recent one would limit the recovery options in case of a disaster. Reference: CompTIA DataSys+ Course Outline, Domain 5.0 Business Continuity, Objective 5.2 Given a scenario, implement backup and restoration of database management systems.
問題 #98
Which of the following scripts would set the database recovery model for sys.database?
答案：C
解題說明：
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.
問題 #99
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