Transactions & Concurrency

1. 🚧 Transactions & Savepoints — BEGIN/COMMIT/ROLLBACK, savepoints.
2. 🚧 Isolation Levels — RC, RCSI, RR, SR, SI — phenomena and trade-offs.
3. 🚧 Deadlock Basics — Reproducing and diagnosing deadlocks.
4. 🚧 Locking Hints — WITH (NOLOCK) and other hints — risks and uses.