[Solved] How does PostgreSQL handle vacuuming in relation to MVCC to maintain database health? — Ans: It removes old row versions that are no longer visible to any transaction | PostgreSQL

PostgreSQL - Transactions and Concurrency

How does PostgreSQL handle vacuuming in relation to MVCC to maintain database health?

AIt removes old row versions that are no longer visible to any transaction

BIt compresses all data to save space

CIt locks tables to prevent concurrent access during cleanup

DIt backs up the database automatically

Step-by-Step Solution

Solution:

Step 1: Understand vacuum's role in MVCC
Vacuum cleans up old row versions (dead tuples) that no active transaction can see.
Step 2: Why vacuum is needed
This prevents table bloat and keeps queries efficient.
Final Answer:
It removes old row versions that are no longer visible to any transaction -> Option A
Quick Check:
Vacuum removes dead tuples for MVCC health [OK]

Quick Trick: Vacuum cleans old invisible row versions [OK]

Common Mistakes:

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How does PostgreSQL handle vacuuming in relation to MVCC to maintain database health?