[Solved] If you run VACUUM ANALYZE orders; on a table, what will happen? — Ans: Dead rows are removed and statistics updated for query planning | PostgreSQL

PostgreSQL - Transactions and Concurrency

If you run VACUUM ANALYZE orders; on a table, what will happen?

AOnly dead rows are removed, no statistics updated

BThe table is locked exclusively during the operation

COnly statistics are updated, no dead rows removed

DDead rows are removed and statistics updated for query planning

Step-by-Step Solution

Solution:

Step 1: Understand combined VACUUM ANALYZE
This command removes dead rows and updates statistics for the query planner.
Step 2: Eliminate partial effects
Options that mention only one effect or locking exclusively are incorrect.
Final Answer:
Dead rows are removed and statistics updated for query planning -> Option D
Quick Check:
VACUUM ANALYZE = Clean + stats update [OK]

Quick Trick: VACUUM ANALYZE cleans and updates stats together [OK]

Common Mistakes:

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If you run VACUUM ANALYZE orders; on a table, what will happen?