snapshot isolation

snapshot isolation

🔧 Distributed Systems Reliability

each transaction receives an isolated snapshot of the database; it commits only if no concurrent writes exist to the same keys

snapshot isolation in a sentence

“Snapshot isolation prevents most anomalies but still allows write skew.”

Related Words

strong consistency

a broad term covering models including sequential, linearizable, and serializable consistency

strong serializability

strengthens serializability by requiring the apparent transaction order to match real-time order

strong session serializability

strengthens serializability by additionally prohibiting session phenomena within each process

strong snapshot isolation

strengthens snapshot isolation by additionally prohibiting real-time phenomena

writes follow reads

reading a value seals the past; later writes must take effect after the writes that were observed

high availability

an inconsistently defined term meaning either majority availability or total availability depending on context