PostgreSQL - Transactions and Concurrency
Which of the following is the correct syntax to acquire a session-level advisory lock with key 12345?
Which of the following is the correct syntax to acquire a session-level advisory lock with key 12345?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Recall advisory lock syntax
PostgreSQL uses the function pg_advisory_lock(key) to acquire a session-level advisory lock.Step 2: Evaluate options
SELECT pg_advisory_lock(12345); is the correct function call. The other options use invalid syntax or non-existent functions.Final Answer:
SELECT pg_advisory_lock(12345); -> Option AQuick Check:
pg_advisory_lock(key) = correct syntax [OK]
Quick Trick: Use SELECT pg_advisory_lock(key) to lock [OK]
Common Mistakes:
- Using LOCK TABLE instead of function call
- Calling non-existent functions like acquire_lock
- Trying to lock with BEGIN LOCK syntax
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