====== Aurora Replicas ======

**What it is:** Read-only instances in an Aurora cluster that replicate from the writer (primary).

**What it’s for:**
  * Scale read traffic (read-heavy workloads).
  * Improve availability (replicas can be promoted during failover).

**Key ideas:**
  * Applications can use a reader endpoint to spread reads across replicas.
  * During failover, a replica can be promoted to become the writer.

**Exam cues:**
  * “read scaling for Aurora” → Aurora Replicas + reader endpoint.
  * “improve availability with replicas” → Aurora replicas (promotion on failover).

**Hard words:**
  * *read-only* /ˌriːd ˈoʊnli/: chỉ đọc
  * *replicate* /ˈreplɪkeɪt/: sao chép
  * *promoted* /prəˈmoʊtɪd/: được nâng lên
  * *failover* /ˈfeɪlˌoʊvər/: chuyển dự phòng