[Solved] What is the main purpose of the Serializable isolation level in PostgreSQL? — Ans: To ensure transactions appear to run one after another without overlap | PostgreSQL

PostgreSQL - Transactions and Concurrency

What is the main purpose of the Serializable isolation level in PostgreSQL?

ATo prevent only lost updates but allow non-repeatable reads

BTo allow dirty reads for faster performance

CTo disable all locking mechanisms during transactions

DTo ensure transactions appear to run one after another without overlap

Step-by-Step Solution

Solution:

Step 1: Understand Serializable Isolation Concept
Serializable isolation ensures transactions behave as if executed sequentially, preventing anomalies.
Step 2: Compare Other Isolation Levels
Other levels allow some anomalies like dirty reads or non-repeatable reads, but Serializable prevents all.
Final Answer:
To ensure transactions appear to run one after another without overlap -> Option D
Quick Check:
Serializable isolation = Sequential transaction appearance [OK]

Quick Trick: Serializable means transactions act like in a strict sequence [OK]

Common Mistakes:

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What is the main purpose of the Serializable isolation level in PostgreSQL?