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What is the highest transaction isolation level that guarantees complete isolation from other transactions?

easy📝 Conceptual Q2 of 15
SQL - Transactions and Data Integrity
What is the highest transaction isolation level that guarantees complete isolation from other transactions?
ARead Committed
BRead Uncommitted
CRepeatable Read
DSerializable
Step-by-Step Solution
Solution:

  1. Step 1: Recall isolation levels hierarchy

    Serializable is the strictest isolation level, preventing all concurrency anomalies.

  2. Step 2: Confirm complete isolation

    Serializable ensures transactions behave as if executed one after another.

  3. Final Answer:

    Serializable -> Option D

  4. Quick Check:

    Highest isolation = Serializable [OK]
Quick Trick: Serializable is strictest, no concurrency anomalies [OK]
Common Mistakes:
  • Choosing Repeatable Read as highest
  • Confusing Serializable with Read Committed

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