Quiz · 5 questions
🔒 Transactions and Concurrency
ACID, isolation, MVCC, locks, deadlocks
Level 0Schema Seedling
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Quiz
01What does ROLLBACK do?
02Why doesn't PostgreSQL have dirty reads at READ COMMITTED?
03What does SELECT ... FOR UPDATE SKIP LOCKED do?
04How do you prevent deadlocks between two transactions updating the same set of rows?
05What does ON CONFLICT (col) DO NOTHING do?
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