Transactions & ConcurrencyTransactions & ConcurrencyIsolation levels, locks, and what blocks what.Copy MarkdownOpenIsolation levels, locks, and what blocks what. Sections5.1Transactions & IsolationBEGIN/COMMIT/ROLLBACK, savepoints, isolation levels5.2Locks & DeadlocksRow/table locks, lock modes, advisory locksMVCCxmin/xmax, snapshots, and visibility rulesTransactions & IsolationBEGIN/COMMIT/ROLLBACK, savepoints, isolation levels