A company needs to deploy a PostgreSQL database into Amazon RDS. The database must be highly available and fault tolerant. Which AWS solution should the company use to meet these requirements?

Question

Options

• AAmazon RDS with a single Availability Zone
• BAmazon RDS snapshots
• CAmazon RDS with multiple Availability Zones
• DAWS Database Migration Service (AWS DMS)

• B
  3% (1)
• C
  94% (31)
• D
  3% (1)

Explanation

Explanation

Deploying Amazon RDS with multiple Availability Zones (Multi-AZ) ensures high availability and fault tolerance by automatically maintaining a synchronous standby replica in a different AZ - if the primary instance fails, RDS automatically fails over to the standby with minimal downtime. Option A (single AZ) creates a single point of failure, meaning any AZ outage would cause database downtime, directly contradicting the requirements. Option B (RDS snapshots) provides backup and recovery capabilities but does not prevent downtime during a failure - it's a restore tool, not a redundancy solution. Option D (AWS DMS) is a migration service used to move databases between sources and targets, and has nothing to do with making a deployed database highly available.

Memory Tip: Think of Multi-AZ = Multiple Safety Nets - just like having a backup parachute, the standby replica in another AZ "catches you" if the primary fails. Whenever an exam question mentions "highly available" + RDS, your instinct should be Multi-AZ.

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