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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA DataSys+ Certification Exam |
| Exam Number: | DS0-001 |
| Exam Price: | $246 USD |
| Passing Score: | 700 (scale 100–900) |
| Available Languages: | Japanese, English |
| Exam Format: | Multiple-choice, Performance-based |
| Real Exam Qty: | Up to 90 |
| Related Certifications: | CompTIA Security+ CompTIA Data+ |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years |
| Recommended Training: | CompTIA Official Study Guide CompTIA DataSys+ Learning Path |
| Exam Registration: | Pearson VUE Testing Center CompTIA Official Registration |
| Sample Questions: | CompTIA DS0-001 Sample Questions |
| Exam Way: | Online proctored or in-person at authorized test centers |
| Pre Condition: | No mandatory prerequisites; recommended 2–3 years of experience in database administration or related roles |
| Official Syllabus URL: | https://www.comptia.org/en/certifications/datasys/ |
>> Detailed CompTIA DS0-001 Answers <<
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NEW QUESTION # 14
(Which of the following normal forms (NFs) is considered the most preferable for relational database design?)
Answer: D
Explanation:
The correct answer is C. 3NF (Third Normal Form). According to CompTIA DataSys+, Third Normal Form is widely regarded as the most preferable and practical level of normalization for relational database design in real-world environments. It strikes an optimal balance between reducing data redundancy, maintaining data integrity, and preserving query performance.
To understand why 3NF is preferred, it is important to consider the progression of normalization. First Normal Form (1NF) ensures that tables contain atomic values and no repeating groups. Second Normal Form (2NF) builds on this by eliminating partial dependencies, ensuring that non-key attributes depend on the entire primary key. While these forms improve structure, they do not fully address all redundancy issues.
Third Normal Form (3NF) goes further by removing transitive dependencies, meaning that non-key attributes depend only on the primary key and not on other non-key attributes. This significantly reduces duplication of data and prevents common anomalies during INSERT, UPDATE, and DELETE operations.
CompTIA DataSys+ emphasizes that eliminating transitive dependencies is critical for maintaining long-term data consistency and integrity.
Although Fourth Normal Form (4NF) and higher normal forms exist, DataSys+ notes that they are typically applied only in specialized cases involving complex multi-valued dependencies. Over-normalization beyond
3NF can increase schema complexity, require excessive joins, and negatively impact performance without providing proportional benefits in most transactional systems.
As a result, 3NF is considered the industry-standard target for relational database design. It provides a clean, maintainable schema that supports scalability, reduces redundancy, and aligns well with performance expectations. CompTIA DataSys+ highlights 3NF as the most commonly implemented and recommended normalization level for operational databases.
Therefore, the most preferable normal form for relational database design is 3NF, making option C the correct and fully verified answer.
NEW QUESTION # 15
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?
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.
NEW QUESTION # 16
Which of the following does a database administrator need to know before planning the setup of a new server for a client?
Answer: B
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 # 17
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?
Answer: C
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 # 18
A database is configured to use undo management with temporary undo enabled. An UPDATE is run on the table.
Which of the following describes where the undo is stored?
Answer: B
Explanation:
When undo management with temporary undo is enabled, the undo data is stored in the temporary tablespace instead of the undo tablespace. The temporary tablespace is a tablespace that stores temporary data such as sort results or intermediate query results. The undo data is the data that records the changes made by transactions on the database. Undo data is used to roll back transactions in case of errors or failures, or to provide read consistency for concurrent queries. By storing undo data in the temporary tablespace, the database can reduce the space consumption and contention in the undo tablespace, and improve performance and scalability.
The other options are either incorrect or irrelevant for this question. For example, the system global area is a memory area that stores information shared by all sessions connected to an instance; the undo tablespace is a tablespace that stores undo data by default; the SYSAUX tablespace is a tablespace that stores auxiliary information for various database features.
NEW QUESTION # 19
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