[Solved] Which scenario most commonly leads to a deadlock in PostgreSQL? — Ans: Two transactions waiting on each other to release locks on resources | PostgreSQL

PostgreSQL - Transactions and Concurrency

Which scenario most commonly leads to a deadlock in PostgreSQL?

AA transaction failing to commit after acquiring a lock

BA single transaction holding a lock for too long

CTwo transactions waiting on each other to release locks on resources

DMultiple transactions reading the same data simultaneously

Step-by-Step Solution

Solution:

Step 1: Understand deadlock definition
A deadlock occurs when two or more transactions wait indefinitely for locks held by each other.
Step 2: Analyze options
Two transactions waiting on each other to release locks on resources describes this exact scenario. Options B and C describe lock issues but not deadlocks. Multiple transactions reading the same data simultaneously is normal concurrent reading.
Final Answer:
Two transactions waiting on each other to release locks on resources -> Option C
Quick Check:
Deadlock means circular wait for locks [OK]

Quick Trick: Deadlock = circular wait between transactions [OK]

Common Mistakes:

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Which scenario most commonly leads to a deadlock in PostgreSQL?