Delta Academy 64-26 Practice Test

Durability is about permanence. It guarantees that once a transaction is committed, its changes are permanent and will survive a system crash or power failure. This relies on mechanisms like write-ahead logging and storing committed updates on non-volatile storage (disks or replicated backups) so the system can recover and replay those changes after a failure. Atomicity is about all-or-nothing behavior for a single transaction, not whether its results survive a crash. Isolation controls how transactions appear to each other during concurrent execution. Consistency ensures the database rules and constraints are preserved, but it doesn’t by itself ensure that committed data won’t be lost after a failure.