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← all concepts

Strong consistency.

also: strongly consistent · strong consistency model

Every read returns the most recent write, and all clients see the same data at the same time.

the two-minute refresher

Achieved with synchronous replication or by reading from the leader only.
Costs latency (coordination) and availability (a leader failure blocks reads).
Needed when stale reads cause real harm: money, inventory, uniqueness.

Where the course teaches it

W01 · Day 2Replication Trade-offslearn it →W05 · Day 1Consistency Modelsrevisit →

Related concepts

Linearizability
Eventual consistency
Synchronous replication