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Which of the following is a direct benefit of using an index on a large table?

easy📝 Conceptual Q2 of 15
SQL - Indexes and Query Performance
Which of the following is a direct benefit of using an index on a large table?
AFaster query execution for searches on indexed columns.
BAutomatic data encryption for security.
CReduced disk space usage for the table.
DPrevents duplicate rows from being inserted.
Step-by-Step Solution
Solution:

  1. Step 1: Identify what indexes improve

    Indexes improve speed of queries that search on the indexed columns.

  2. Step 2: Eliminate unrelated options

    Encryption, disk space reduction, and duplicate prevention are not direct benefits of indexes.

  3. Final Answer:

    Faster query execution for searches on indexed columns. -> Option A

  4. Quick Check:

    Index benefit = Faster queries [OK]
Quick Trick: Indexes speed up searches but don't encrypt or reduce space [OK]
Common Mistakes:
  • Confusing indexes with encryption features
  • Thinking indexes save disk space
  • Assuming indexes prevent duplicates

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