PostgreSQL - Transactions and Concurrency
You want to ensure that a critical section of your application runs only once at a time across all sessions. Which advisory lock type should you use?
You want to ensure that a critical section of your application runs only once at a time across all sessions. Which advisory lock type should you use?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the requirement for critical section locking
The critical section must be locked so only one session can run it at a time, and the lock should release automatically after transaction ends.Step 2: Choose the appropriate lock type
Transaction-level exclusive advisory locks ensure mutual exclusion during the transaction and release automatically, preventing deadlocks or stale locks.Final Answer:
Transaction-level exclusive advisory lock -> Option DQuick Check:
Critical section lock = transaction-level exclusive [OK]
Quick Trick: Use transaction-level exclusive locks for critical sections [OK]
Common Mistakes:
- Using session-level locks that persist beyond transaction
- Choosing shared locks which allow concurrent access
- Confusing session and transaction lock scopes
Master "Transactions and Concurrency" in PostgreSQL
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore PostgreSQL Quizzes