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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Database Support, Maintenance & Optimization | 20% | - Index Management - Database Security (Users, Roles, Permissions) - Query Optimization - Performance Monitoring - Patch Management - Backup and Recovery Procedures |
| Topic 2: Data Analytics & Engineering | 19% | - Data Warehousing Concepts - Reporting Concepts - Data Governance - Data Visualization Basics - ETL Processes - Data Quality |
| Topic 3: Database Deployment & Planning | 19% | - High Availability Architecture - Capacity Planning - Database Clustering - Disaster Recovery Planning - Replication Strategies - Database Server Requirements |
| Topic 4: Database Fundamentals | 20% | - ACID Properties - CAP Theorem - Database Design Principles - Data Normalization - Data Models (Relational, NoSQL, etc.) - Database Concepts and Architecture |
| Topic 5: Database Implementation | 22% | - Database Objects (Tables, Views, Indexes) - Triggers - Data Import/Export - SQL DDL Statements - Data Types and Constraints - Stored Procedures and Functions |
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NEW QUESTION # 72
Which of the following is an advantage of creating indexes?
Answer: D
Explanation:
The advantage of creating indexes is to provide quick and efficient access to data. An index is a data structure that stores the values of one or more columns of a table in a sorted order, along with pointers to the corresponding rows in the table. An index helps to speed up queries that search, filter, sort, or join data based on the indexed columns, as it reduces the number of disk accesses or scans required to locate the desired data. An index also helps to enforce uniqueness or referential integrity constraints on the indexed columns. The other options are either not true or not relevant for this purpose. For example, an index does not help with space allocation, as it consumes additional space in the database; an index does not reduce memory, as it may use memory for caching or buffering purposes; an index does not update the query plan, as it is an input or a factor for the query optimizer to generate the query plan.
NEW QUESTION # 73
Which of the following refers to the correctness and completeness of data in a database?
Answer: B
Explanation:
Data integrity ensures that data in the database is accurate, consistent, and complete over its lifecycle.
NEW QUESTION # 74
A business analyst is using a client table and an invoice table to create a database view that shows clients who have not made purchases yet. Which of the following joins is most appropriate for the analyst to use to create this database view?
Answer: D
Explanation:
The join that is most appropriate for the analyst to use to create this database view is option D. This join uses the LEFT JOIN clause to combine the client table and the invoice table based on the matching values in the Key column. The WHERE clause filters out the rows where the Invoice.Key column is not null, meaning that the client has made a purchase. The result is a view that shows only the clients who have not made any purchases yet. The other options either do not produce the desired result or have syntax errors. For example, option A would show only the clients who have made purchases, option B would show only the invoices that do not have a matching client, and option C would show all the clients regardless of their purchase status. 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 # 75
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?
Answer: D
Explanation:
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.
NEW QUESTION # 76
Which of the following database structures is designed to store images, records, video, and audio in a single repository?
Answer: A
Explanation:
NoSQL databases are designed to store and manage diverse data types such as images, video, audio, and records in a flexible, single repository without fixed schemas.
NEW QUESTION # 77
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