Suggest an editImprove this articleRefine the answer for “Why do transactions guarantee atomicity?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)Transactions guarantee **atomicity** because the database executes them as **a single unit** - a set of actions that can't be split into parts: if even one step of the transaction fails, the system **rolls back everything**, using logging mechanisms (a transaction log). **Key point:** for example, when transferring money from one account to another, the debit and credit operations either both run or both get undone - achieving the "all or nothing" principle, so the database stays consistent regardless of errors, failures, or outages.Shown above the full answer for quick recall.Answer (EN)ImageTransactions guarantee **atomicity** because the database executes them as **a single unit** - a set of actions that can't be split into parts. If even one step of a transaction fails, the system **rolls back everything**, using logging mechanisms (a transaction log). That means no intermediate changes ever make it into the database. For example, when transferring money from one account to another, the debit and credit operations either both run, or both get undone. This achieves the **"all or nothing"** principle, and the database stays consistent regardless of errors, failures, or outages.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.