Transactions & Locking Quiz

Sample questions

1. A signup inserts a user, then a team, then a membership, each with its own commit. The pod is killed after the team insert. What is left in the database?
2. In Spring, checkout() calls this.placeOrder(), which is annotated @Transactional. What happens?
3. A Spring @Transactional method throws a checked exception. By default, the transaction is…
4. Your checkout calls a payment API inside a transaction that holds a row lock on the event's inventory. The API slows to 8 s. What happens to other checkouts for that event?
5. Pool throughput is roughly…