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The all-or-nothing property of transactions ensuring that partial changes never persist.
DESCRIPTION
Atomicity guarantees that a transaction’s operations either all succeed and commit or all fail and roll back. It prevents partial writes that could corrupt data integrity. Databases implement atomicity via write-ahead logging, undo logs, or MVCC. In distributed systems, atomicity can be orchestrated with two-phase commit or compensated with sagas. Atomicity complements consistency, isolation, and durability to deliver reliable data operations.
ALTERNATIVE DEFINITIONS
Wikipedia
Atomicity means that each transaction is all or nothing.
Captures atomicity succinctly within the ACID framework.
PostgreSQL
Transactions are atomic: they are either applied completely or not at all.
Database-focused articulation of the atomic property.
RELATED TERMS
ACID Consistency Isolation Durability Transaction Rollback Commit Two-Phase Commit Idempotency Saga Pattern
COMPETING TERMS
KNOWLEDGE AREAS
Data Storage & Operations Data Engineering Software Engineering
TARGET AUDIENCE
Data Engineer Software Developer Data Architect Solution Architect
EXTERNAL SOURCES
- Wikipedia - ACID
- MySQL - Glossary definition of atomic transactions
- Microsoft - SQL Server transactions overview
TOP QUESTIONS
Why does atomicity matter in databases?
It prevents partial updates that can corrupt data, ensuring integrity even when failures occur mid-transaction.
Category: Relevancy
How is atomicity implemented?
Through transactional logs, write-ahead logging, and rollback mechanisms that revert changes on failure.
Category: Concept
What is a common mistake regarding atomicity?
Assuming multi-statement operations are atomic without explicit transactions; many systems require BEGIN/COMMIT blocks.
Category: Mistakes
Does eventual consistency violate atomicity?
Not necessarily, but cross-node atomicity is challenging; eventual consistency concerns visibility timing, not per-transaction all-or-nothing semantics.
Category: Misunderstanding
How do distributed systems handle atomicity?
Two-phase commit provides atomic commits across resources; sagas use compensations where strict atomicity is impractical.
Category: Guidance
What is the relationship between atomicity and durability?
Atomicity ensures all-or-nothing changes, while durability ensures committed changes persist after failures.
Category: Concept
How can I test atomicity?
Introduce failures mid-transaction and verify that no partial effects persist; chaos testing can help.
Category: Testing
Is idempotency a substitute for atomicity?
No. Idempotency mitigates retries and duplicates but does not guarantee all-or-nothing state changes.
Category: Misunderstanding
Do NoSQL databases support atomicity?
Many offer atomicity at document or partition level; cross-partition atomicity may require patterns like sagas.
Category: Comparison