repeatable read

serializability

all transactions appear to execute in some total serial order, prohibiting dirty writes, dirty reads, and anti-dependency cycles

sequential consistency

operations appear in a total order consistent with each process's order but not necessarily real-time order

snapshot isolation

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

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