[Solved] Why must cursors in PostgreSQL be declared inside a transaction block? — Ans: Because cursors rely on a stable snapshot of data during the transaction | PostgreSQL

PostgreSQL - Advanced PL/pgSQL

Why must cursors in PostgreSQL be declared inside a transaction block?

ABecause cursors require exclusive locks on tables

BBecause cursors automatically commit changes after each fetch

CBecause cursors cannot be used with SELECT statements outside transactions

DBecause cursors rely on a stable snapshot of data during the transaction

Step-by-Step Solution

Solution:

Step 1: Understand cursor data consistency
Cursors provide a stable view of data, which requires a transaction snapshot.
Step 2: Analyze options
Only Because cursors rely on a stable snapshot of data during the transaction correctly explains the need for transaction block.
Final Answer:
Because cursors rely on a stable snapshot of data during the transaction -> Option D
Quick Check:
Transaction needed for stable cursor snapshot [OK]

Quick Trick: Transaction ensures cursor sees consistent data [OK]

Common Mistakes:

Master "Advanced PL/pgSQL" in PostgreSQL

9 interactive learning modes - each teaches the same concept differently

Why must cursors in PostgreSQL be declared inside a transaction block?