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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA DataSys+ Certification Exam |
| Exam Number: | DS0-001 |
| Passing Score: | 700 (on a scale of 100–900) |
| Certificate Validity Period: | 3 years |
| Exam Price: | $390 USD (approximate; may vary by region) |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | Up to 90 questions |
| Available Languages: | English, Japanese |
| Related Certifications: | CompTIA Security+ CompTIA Data+ CompTIA Server+ |
| Exam Format: | Performance-based questions, Multiple-choice |
| Recommended Training: | Official DataSys+ Study Guide (DS0-001) CompTIA CertMaster Learn DataSys+ |
| Exam Registration: | CompTIA Official Certification Page Pearson VUE Exam Registration |
| Sample Questions: | CompTIA DS0-001 Sample Questions |
| Exam Way: | Online proctored or in-person testing via Pearson VUE authorized test centers |
| Pre Condition: | No formal prerequisites; 2–3 years of experience in database administration is recommended. |
| Official Syllabus URL: | https://www.comptia.org/certifications/datasys |
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질문 # 11
(A database administrator realizes that certain data was not captured correctly when it was imported. Which of the following commands should the administrator use to fix the issue?)
정답：A
설명：
The correct answer is A. UPDATE. CompTIA DataSys+ classifies the UPDATE command as a Data Manipulation Language (DML) statement used to modify existing data within a table. When data is imported incorrectly-such as having wrong values, missing fields, or improperly formatted entries-the appropriate corrective action is to update the affected records rather than removing data structures or deleting records outright.
The UPDATE command allows a database administrator to correct specific columns or rows by setting them to the proper values while preserving the rest of the dataset. This aligns with DataSys+ best practices, which emphasize data integrity, minimal disruption, and precision when fixing data-related issues. By using a WHERE clause, the administrator can target only the incorrect records, reducing risk and avoiding unnecessary data loss.
Option B, DROP TABLE, is a DDL command that completely removes a table and all its data and structure.
This is an extreme action and would not be appropriate when only certain data values are incorrect. Option C, DELETE, removes rows from a table, which may result in loss of valid data rather than correcting it. Deletion is only appropriate when data should no longer exist, not when it needs correction. Option D, ALTER TABLE, is also a DDL command used to modify table structure (such as adding or changing columns), not to fix incorrect row-level data.
CompTIA DataSys+ stresses the importance of choosing the least destructive and most targeted command when resolving data issues. Correcting imported data typically involves adjusting values rather than altering schema or removing data entirely.
Therefore, to fix incorrectly captured imported data while maintaining database integrity and availability, the administrator should use the UPDATE command, making option A the correct and fully verified answer.
질문 # 12
Which of the following types of RAID, if configured with the same number and type of disks, would provide the best write performance?
정답：D
설명：
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.
질문 # 13
Which of the following indexes stores records in a tabular format?
정답：A
설명：
The index that stores records in a tabular format is columnstore. A columnstore index is a type of index that stores and compresses data by columns rather than by rows. A columnstore index can improve the performance and efficiency of queries that perform aggregations, calculations, or analysis on large amounts of data, such as data warehouse or business intelligence applications. A columnstore index can also reduce the storage space required for data by applying various compression techniques, such as dictionary encoding, run-length encoding, bit packing, etc. The other options are either different types of indexes or not related to indexes at all. For example, a non-clustered index is a type of index that stores the values of one or more columns in a sorted order along with pointers to the corresponding rows in the table; a unique index is a type of index that enforces uniqueness on one or more columns in a table; a secondary index is an alternative term for a non-clustered index. Reference: CompTIA DataSys+ Course Outline, Domain 3.0 Database Management and Maintenance, Objective 3.1 Given a scenario, perform common database maintenance tasks.
질문 # 14
Which of the following NFs is considered the most preferable for relational database design?
정답：A
설명：
The NF (normal form) that is considered the most preferable for relational database design is 3 NF. 3 NF, or Third Normal Form, is a level of normalization that organizes data into tables and columns to reduce redundancy and improve consistency. Normalization is a process that applies a set of rules or criteria to eliminate or minimize the anomalies or problems that may arise from inserting, updating, or deleting data in a database. 3 NF is achieved when a table satisfies the following conditions: - It is in 2 NF (Second Normal Form), which means that every non-key column depends on the whole primary key and not on any subset of it - It has no transitive dependencies, which means that every non-key column depends directly on the primary key and not on any other non-key column 3 NF is considered the most preferable for relational database design because it ensures that each table has only one purpose or theme and that each column has only one value or meaning. This helps avoid data duplication, inconsistency, and update anomalies. The other options are either lower or higher levels of normalization that are either less preferable or less practical for relational database design. For example, 1 NF (First Normal Form) is the lowest level of normalization that requires each column to have atomic values and each row to have a unique identifier; 4 NF (Fourth Normal Form) is a higher level of normalization that requires each table to have no multi-valued dependencies, which means that there are no columns that can have more than one value for the same primary key value; 2 NF (Second Normal Form) is an intermediate level of normalization that requires each non-key column to depend on the whole primary key and not on any subset of it.
질문 # 15
Which of the following cloud delivery models provides users with the highest level of flexibility regarding resource provisioning and administration?
정답：A
설명：
The cloud delivery model that provides users with the highest level of flexibility regarding resource provisioning and administration is IaaS. IaaS, or Infrastructure as a Service, is a cloud delivery model that provides users with access to virtualized computing resources, such as servers, storage, network, and operating systems, over the internet. Users can provision, configure, and manage these resources according to their needs and preferences, without having to worry about the maintenance or security of the physical infrastructure. IaaS offers users the most control and customization over their cloud environment, as well as the ability to scale up or down as needed. The other options are either different cloud delivery models or not related to cloud computing at all. For example, DBaaS, or Database as a Service, is a cloud delivery model that provides users with access to database management systems and tools over the internet; SaaS, or Software as a Service, is a cloud delivery model that provides users with access to software applications and services over the internet; PaaS, or Platform as a Service, is a cloud delivery model that provides users with access to development platforms and tools over the internet.
질문 # 16
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DS0-001퍼펙트 인증공부: https://www.itcertkr.com/DS0-001_exam.html
2026 Itcertkr 최신 DS0-001 PDF 버전 시험 문제집과 DS0-001 시험 문제 및 답변 무료 공유: https://drive.google.com/open?id=1L85mZe6fiu_ziDmJiSJ560WXL4artWWP