Normalization concept check: Is normalization a formal process for deciding which attributes belong together in a relation (table) to reduce redundancy and anomalies?

Difficulty: Easy

Correct Answer: Correct

Explanation:


Introduction / Context:
Normalization organizes attributes into relations based on dependencies, with the goal of minimizing redundancy and eliminating update anomalies (insertion, deletion, modification anomalies). It proceeds via well-defined normal forms (1NF, 2NF, 3NF, BCNF, and beyond).



Given Data / Assumptions:

  • Functional dependencies capture how attributes depend on keys.
  • Higher normal forms remove problematic dependencies.
  • The output is a set of tables with appropriate keys and foreign keys.



Concept / Approach:
The statement frames normalization as a formal process to decide which attributes should be grouped in a relation. That is accurate: by analyzing dependencies, we decide which attributes co-reside to maintain logical coherence and avoid redundancy.



Step-by-Step Solution:
Place data into 1NF: atomic values, no repeating groups.Check partial dependencies; decompose to achieve 2NF (no partial dependency on a composite key).Remove transitive dependencies to reach 3NF.Optionally enforce BCNF when every determinant is a candidate key.Validate decompositions for losslessness and dependency preservation.



Verification / Alternative check:
Test with sample tuples: confirm that anomalies disappear (e.g., updating a faculty office number no longer touches multiple rows when office is stored with faculty, not with each course section).



Why Other Options Are Wrong:
Incorrect: normalization is formal, not ad hoc.True only up to 2NF: higher normal forms are part of the process.OLAP only: dimensional models often denormalize; normalization is primarily an OLTP design concern.



Common Pitfalls:
Over-normalizing without considering performance; under-normalizing leading to anomalies; ignoring real query patterns and necessary denormalization in reporting systems.



Final Answer:
Correct

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