PostgreSQL - Transactions and Concurrency
Which transaction isolation level in PostgreSQL prevents dirty reads but allows non-repeatable reads and phantom reads?
Which transaction isolation level in PostgreSQL prevents dirty reads but allows non-repeatable reads and phantom reads?
easy📝 Conceptual Q1 of 15
Step-by-Step Solution
Solution:
Step 1: Understand dirty reads
Dirty reads occur when a transaction reads uncommitted changes from another transaction.Step 2: Identify isolation level preventing dirty reads but allowing others
Read Committed prevents dirty reads but allows non-repeatable and phantom reads.Final Answer:
Read Committed -> Option BQuick Check:
Prevents dirty reads = Read Committed [OK]
Quick Trick: Read Committed blocks dirty reads but not phantoms [OK]
Common Mistakes:
- Confusing Read Committed with Serializable
- Thinking Read Uncommitted prevents dirty reads
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