[Solved] How do you correctly initiate a transaction with REPEATABLE READ isolation level in PostgreSQL? — Ans: SET TRANSACTION ISOLATION LEVEL REPEATABLE READ; BEGIN; | PostgreSQL

PostgreSQL - Transactions and Concurrency

How do you correctly initiate a transaction with REPEATABLE READ isolation level in PostgreSQL?

ASTART TRANSACTION ISOLATION LEVEL REPEATABLE READ;

BSET TRANSACTION ISOLATION LEVEL REPEATABLE READ; BEGIN;

CBEGIN ISOLATION LEVEL REPEATABLE READ;

DBEGIN TRANSACTION REPEATABLE READ;

Step-by-Step Solution

Solution:

Step 1: Recall PostgreSQL syntax
PostgreSQL requires setting the isolation level before beginning the transaction or within the BEGIN statement.
Step 2: Evaluate options
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ; BEGIN; correctly sets the isolation level first, then begins the transaction. Options A and B are invalid syntax. BEGIN ISOLATION LEVEL REPEATABLE READ; is close but not valid in PostgreSQL.
Final Answer:
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ; BEGIN; -> Option B
Quick Check:
Set isolation level before BEGIN [OK]

Quick Trick: Set isolation level before BEGIN [OK]

Common Mistakes:

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How do you correctly initiate a transaction with REPEATABLE READ isolation level in PostgreSQL?