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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA DataSys+ Certification Exam |
| Exam Number: | DS0-001 |
| Available Languages: | Japanese, English |
| Exam Duration: | 90 minutes |
| Passing Score: | 700 (scale 100–900) |
| Exam Format: | Multiple-choice, Performance-based |
| Real Exam Qty: | Up to 90 |
| Exam Price: | $246 USD |
| Certificate Validity Period: | 3 years |
| Related Certifications: | CompTIA Data+ CompTIA Security+ |
| Recommended Training: | CompTIA DataSys+ Learning Path CompTIA Official Study Guide |
| 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/ |
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54. Frage
(Which of the following indexes stores records in a tabular format?)
Antwort: B
Begründung:
The correct answer is A. Columnstore. According to CompTIA DataSys+, a columnstore index stores data in a column-oriented, tabular structure, where each column of a table is stored separately rather than storing entire rows together. This design is particularly optimized for analytical and reporting workloads, which commonly scan large datasets and perform aggregations on specific columns.
In a columnstore index, data is logically still represented in a table-like (tabular) format, but physically organized by columns instead of rows. This allows the database engine to read only the required columns for a query, significantly reducing disk I/O and improving query performance. DataSys+ highlights columnstore indexes as a best practice for data warehousing, business intelligence, and read-heavy analytical queries.
Option B, a non-clustered index, stores a separate index structure that contains indexed column values and pointers to the underlying table rows. While it improves lookup performance, it does not store data in a tabular columnar format. Option C, a unique index, is a constraint-based index that enforces uniqueness on column values but does not define how data is physically stored. Option D, a secondary index, is a general term for indexes that are not primary and does not specifically describe column-based tabular storage.
Sys+ emphasizes understanding different index types and their appropriate use cases. Columnstore indexes are distinct because they physically reorganize data by columns, compress data efficiently, and support high-performance analytics. This makes them especially effective in scenarios involving large datasets and complex queries.
Therefore, the index type that stores records in a tabular, column-oriented format is the columnstore index
, making option A the correct and fully verified answer aligned with CompTIA DataSys+ objectives.
55. Frage
An automated script is using common passwords to gain access to a remote system. Which of the following attacks is being performed?
Antwort: A
Begründung:
The attack that is being performed is brute-force. A brute-force attack is a type of attack that tries to guess a password or a key by systematically trying all possible combinations of characters or values until the correct one is found. A brute-force attack can use common passwords, such as
"123456", "password", or "qwerty", as well as dictionaries, word lists, or patterns to speed up the process. A brute-force attack can target a remote system, such as a web server, an email account, or a network device, and gain unauthorized access to its data or resources. The other options are either different types of attacks or not related to password guessing. For example, a DoS, or Denial-of-Service, attack is a type of attack that floods a system with requests or traffic to overwhelm its capacity and prevent legitimate users from accessing it; an SQL injection attack is a type of attack that inserts malicious SQL statements into an input field or parameter of a web application to manipulate or compromise the underlying database; a phishing attack is a type of attack that sends fraudulent emails or messages that appear to come from a trusted source to trick users into revealing their personal or financial information.
56. Frage
Which of the following NFs is considered the most preferable for relational database design?
Antwort: D
Begründung:
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.
57. Frage
(New users at a company are reporting that the system is not accepting new credentials when the users are asked to change the credentials for the first time. Which of the following is the reason the credentials are being rejected?)
Antwort: A
Begründung:
The correct answer is D. Password policies. CompTIA DataSys+ emphasizes that password policies are a core component of authentication and security controls within database systems and enterprise environments.
When new users are required to change their credentials for the first time, the system typically enforces predefined password rules. If the new credentials do not meet these rules, the system will reject them automatically.
Password policies define specific requirements such as minimum password length, complexity (use of uppercase letters, lowercase letters, numbers, and special characters), password history, expiration intervals, and restrictions against using previously compromised or common passwords. In many environments, first- time password changes are subject to the strictest enforcement of these rules to ensure strong baseline security from the start of a user's lifecycle.
Option A, identity management, focuses on the creation, provisioning, and lifecycle management of user identities across systems. While identity management systems initiate the credential change process, they do not usually enforce the detailed rules that cause a password to be rejected. Option B, access controls, govern what resources a user can access after authentication, not whether a password itself is valid. Option C, service accounts, are non-interactive accounts used by applications or services and are unrelated to new end-user credential changes.
DataSys+ documentation highlights that authentication failures during credential updates are most commonly tied to policy enforcement, not permissions or account type. This includes scenarios where users unknowingly violate complexity rules or reuse default or temporary passwords that are explicitly disallowed.
Therefore, the rejection of new credentials during a first-time password change is best explained by password policies, making option D the most accurate and verified answer according to CompTIA DataSys+ principles.
58. Frage
Which of the following describes the purpose of a snapshot?
Antwort: C
Begründung:
The purpose of a snapshot is to create an image of a database. A snapshot is a copy of the state and content of a database at a specific point in time. A snapshot can be used for various purposes, such as backup and recovery, testing and development, reporting and analysis, etc. A snapshot can be created using various techniques, such as full copy, incremental copy, differential copy, etc. A snapshot can also be created using various tools or commands provided by the database system or software.
59. Frage
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