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Read replica

A copy of the database that serves reads; writes go to the primary.

Taught in Chapter 16: Replication.

More from the same chapter

• Eventual consistency: Copies catch up eventually; right after a write, a read can return the old value.
• Primary: The database node that takes every write and copies it to the replicas.
• Read your writes: A promise that a user always sees their own changes.
• Replication lag: The delay before a replica has a write the primary already has.