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NEW QUESTION # 70
Which of the following best describes a collection of data that shares the same properties or attributes?
Answer: C
Explanation:
The option that best describes a collection of data that shares the same properties or attributes is entity set. An entity set is a term used in the entity-relationship (ER) model, which is a conceptual model for designing and representing databases. An entity set is a collection of entities that have the same type or characteristics, such as students, courses, products, etc. An entity is an object or thing that can be identified and distinguished from others, such as a specific student, course, product, etc. An entity set can have one or more attributes that describe the properties or features of the entities, such as name, age, price, etc. An entity set can also have one or more relationships with other entity sets that define how the entities are associated or connected, such as enrolled, taught by, purchased by, etc. The other options are either different terms or not related to the ER model at all. For example, relation set is a term used in the relational model, which is a logical model for implementing and manipulating databases; ER model is a term used to refer to the entity-relationship model itself; tuples are rows or records in a table or relation. Reference: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.1 Given a scenario, identify common database types.
NEW QUESTION # 71
Which of the following commands when executed will rebuild statistics against user-defined tables in a database?
Answer: A
NEW QUESTION # 72
(A developer needs to integrate a trigger to execute an action in a database. Which of the following SQL snippets is a correct use of a trigger?)
Answer: D
Explanation:
Option D is the only snippet that demonstrates a valid trigger timing and event pairing as commonly tested for DataSys+ objectives around database automation and enforcing data integrity. In mainstream relational databases that support row-level triggers (for example, MySQL/MariaDB-style syntax), triggers are typically defined to fire BEFORE or AFTER a DML event such as INSERT, UPDATE, or DELETE. Option D uses BEFORE UPDATE, which is a recognized pattern: it runs automatically prior to an update operation, allowing the database to enforce business rules or modify values consistently and centrally.
By contrast, ALTER and DROP are DDL operations and are not generally supported as row-level trigger events in common SQL implementations; they are handled through DDL auditing features, event triggers (in specific platforms), or administrative logging-not through FOR EACH ROW triggers. Therefore, options A and C are incorrect for typical trigger usage patterns expected in DataSys+ scenarios. Option B is also invalid because DURING is not a standard trigger timing keyword; the standard model is BEFORE/AFTER (and in some platforms, INSTEAD OF for views).
One typing/logic note: many platforms require referencing the row being modified (for example, NEW.
column and OLD.column) rather than bare column names, and trigger bodies often use BEGIN ... END plus statement terminators. Still, among the provided choices, D correctly illustrates the concept DataSys+ emphasizes: using triggers to automate consistent rule enforcement on DML changes.
NEW QUESTION # 73
Following a security breach, a database administrator needs to ensure users cannot change data unless a request is approved by the management team. Which of the following principles addresses this issue?
Answer: B
Explanation:
The principle that addresses this issue is least privilege. Least privilege is a security principle that states that users should only have the minimum level of access or permissions required to perform their tasks or roles.
By applying this principle, the administrator can ensure that users cannot change data unless they have been authorized by the management team through a request approval process. This prevents unauthorized or accidental modifications of data that may compromise its integrity or security. The other options are either opposite or unrelated to this principle. For example, open access means that users have unrestricted access to data; least resistance means that users have the easiest or most convenient access to data; elevated privilege means that users have higher or more permissions than they need. References: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.1 Given a scenario, apply security principles and best practices for databases.
NEW QUESTION # 74
A database administrator needs to remove a redundant customer table from a database in order to streamline periodic reports. Which of the following commands is best for this task?
Answer: C
Explanation:
The DROP TABLE command permanently removes the entire customer table and its data from the database, streamlining reports and eliminating redundancy.
NEW QUESTION # 75
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