Read replicas in managed relational databases
WHAT IT TESTS: scaling reads and replication basics. OUTLINE: a read replica is an async copy of the primary that serves read-only queries, offloading the primary and scaling read-heavy workloads; expect replication lag.
WHAT IT TESTS: understanding read scaling versus high availability. ANSWER OUTLINE: a read replica is an asynchronously replicated, read-only copy of the primary database; its purpose is to offload read traffic so the primary handles writes, letting read-heavy applications scale by spreading queries across replicas. Mention replication lag means replicas may be slightly stale, and that this differs from a synchronous standby used purely for failover.
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- #databases
- #read-replica
- #scaling
- #replication
- #cloud
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