SAA-C03 Q608 · Database

Question

A company runs a critical Amazon RDS for MySQL DB instance in a single Availability Zone. The company must improve the availability of the DB instance. Which solution will meet this requirement?

Accepted Answer

**Option C: Configure the DB instance to use a Multi-AZ DB instance deployment.**

**Requirement:** Improve the availability of an RDS MySQL DB instance currently running in a single AZ.

**How Multi-AZ solves this:**
1. **Synchronous replication:** AWS automatically provisions and maintains a synchronous standby replica in a different Availability Zone within the same Region.
2. **Automatic failover:** If the primary instance fails (hardware failure, AZ outage, patching), RDS automatically fails over to the standby — typically within 60-120 seconds.
3. **Same DNS endpoint:** The application continues to use the same DNS endpoint; RDS updates the DNS record to point to the standby, requiring no application code changes.
4. **Data durability:** Because replication is synchronous, there is z

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