Replication lag is most relevant to which replication type?

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Multiple Choice

Replication lag is most relevant to which replication type?

Replication lag measures the time delay between when a write is committed on the primary and when that write is applied on the replica. This phenomenon is most relevant in asynchronous replication because the primary acknowledges a write without waiting for the replica to catch up. Since updates are not blocked by the follower, the replica can fall behind, and the gap between the two systems grows with load, network latency, or throughput limits. In contrast, synchronous replication waits for the replica to acknowledge the write before the operation is considered complete, so lag is effectively minimized from the perspective of the client. Snapshot-based replication introduces lag due to the interval between snapshots, but it’s a different mechanism than the ongoing delay seen in asynchronous replication.

Replication lag measures the time delay between when a write is committed on the primary and when that write is applied on the replica. This phenomenon is most relevant in asynchronous replication because the primary acknowledges a write without waiting for the replica to catch up. Since updates are not blocked by the follower, the replica can fall behind, and the gap between the two systems grows with load, network latency, or throughput limits.

In contrast, synchronous replication waits for the replica to acknowledge the write before the operation is considered complete, so lag is effectively minimized from the perspective of the client. Snapshot-based replication introduces lag due to the interval between snapshots, but it’s a different mechanism than the ongoing delay seen in asynchronous replication.

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