Which of the following best describes the purpose of requirement checks in…
2025
Which of the following best describes the purpose of requirement checks in maintaining data validity within a database system?
- A.
To optimize query execution and indexing
- B.
To ensure that data backup and recovery processes run efficiently
- C.
To allow users to input data without constraint for rapid prototyping
- D.
To restrict data input to values that meet defined conditions
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Correct answer: D
In database management systems (DBMS), maintaining Data Integrity is essential to ensure that the data remains accurate, consistent, and reliable over its lifecycle.
Requirement checks (such as CHECK constraints) are declarative rules defined on columns to restrict the values that can be stored in them.
For example, a constraint like CHECK (Age >= 18) or CHECK (Salary > 0) forces the database engine to evaluate every incoming record. If an application or user attempts to enter a negative salary or an age under 18, the database system will block the transaction and throw an error. By restricting input strictly to values that meet these predefined conditions, the database automatically prevents bad or nonsensical data from corrupting the system.