====== RDS (Relational Database Service) ======

**What it is:** A managed relational database service (MySQL, PostgreSQL, MariaDB, Oracle, SQL Server).

**What it’s for:**
  * Run relational databases without managing OS-level database operations.
  * Get managed backups, patching, monitoring, and HA options.

**Key ideas:**
  * HA option: [[aws:database:rds:multi-az|Multi-AZ]] (standby in another AZ, automatic failover).
  * Scale reads: [[aws:database:rds:read-replica|Read Replicas]].
  * Automated backups and snapshots.

**Exam cues:**
  * “relational DB, managed, automatic backups” → RDS.
  * “survive AZ outage, same endpoint” → RDS Multi-AZ.

**Hard words (English + IPA + Vietnamese meaning):**
  * *relational* /rɪˈleɪʃənl/: quan hệ (SQL)
  * *patching* /ˈpætʃɪŋ/: vá/cập nhật
  * *high availability (HA)* /haɪ əˌveɪləˈbɪləti/: tính sẵn sàng cao
  * *endpoint* /ˈendpɔɪnt/: điểm truy cập (host/URL)