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Zorluk: OrtaDatabase High Availability

A SysOps Administrator is deploying an Amazon RDS Multi-AZ DB cluster to support a business-critical application that requires high availability and read scaling. The database engine selected is PostgreSQL. Which of the following statements correctly describe the characteristics and failover behavior of this Amazon RDS Multi-AZ DB cluster? (Select TWO.)

  1. The deployment consists of one primary DB instance and two readable standby DB instances across three separate Availability Zones.Cevap
  2. During a failover event, Amazon RDS automatically promotes one of the readable standby instances to primary and updates the cluster's DNS endpoint to point to the new primary instance.Cevap
  3. C
    Read traffic is load-balanced across the standby instances by configuring an Amazon Route 53 active-active failover routing policy pointing directly to the individual DB instance endpoints.
  4. D
    The standby instances in the deployment are passive, non-readable targets, meaning a separate standalone Read Replica must be configured to offload read queries.

Cevap

The correct statements are that the deployment consists of one primary DB instance and two readable standby DB instances across three separate Availability Zones, and that Amazon RDS automatically promotes one of the readable standby instances to primary and updates the cluster's DNS endpoint to point to the new primary instance.
The correct statements are that the deployment consists of one primary DB instance and two readable standby DB instances across three separate Availability Zones, and that Amazon RDS automatically promotes one of the readable standby instances to primary and updates the cluster's DNS endpoint to point to the new primary instance. An Amazon RDS Multi-AZ DB cluster is specifically designed to provide both high availability and read scalability out of the box by using two readable standby instances across three Availability Zones. Amazon RDS manages the failover automatically by promoting a standby and modifying the DNS mapping of the cluster endpoint.

Adım Adım Çözüm

1
Analyze the architecture of an Amazon RDS Multi-AZ DB cluster.
Identify that a Multi-AZ DB cluster comprises one primary and two readable standby DB instances located across three different Availability Zones.
This sets it apart from standard Multi-AZ DB instances which have only one non-readable standby instance.
2
Examine the automated failover mechanism for RDS Multi-AZ DB clusters.
Confirm that failover is fully managed by Amazon RDS, which automatically promotes a standby and updates the cluster DNS endpoint.
This provides seamless failover without requiring Route 53 routing policy configurations or manual promotions.
3
Evaluate how read scaling is handled in this architecture.
Determine that standby instances are readable, eliminating the need to configure separate read replicas for basic read scaling, and that traffic is handled via the built-in reader endpoint.
This distinguishes it from standard Multi-AZ instances where standby instances cannot accept read connections.

Anahtar Kavram

Amazon RDS Multi-AZ DB cluster architecture provides both high availability via automated DNS-based failover to readable standby instances and read scaling via a built-in reader endpoint.
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Database High Availability

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