What should a solutions architect do to improve the application’s performance?
Serve read traffic from the Multi-AZ standby replica.
Configure the DB instance to use Transfer Acceleration.
Create a read replica from the source DB instance. Serve read traffic from the read replica.
Use Amazon Kinesis Data Firehose between the application and Amazon RDS to increase the concurrency of database requests.
Explanations:
Serving read traffic from the Multi-AZ standby replica is not possible, as Multi-AZ deployments are designed for failover and high availability rather than for scaling read traffic. The standby replica cannot be used for read operations in a Multi-AZ configuration.
Configuring the DB instance to use Transfer Acceleration is not applicable to Amazon RDS for PostgreSQL. Transfer Acceleration is a feature for Amazon S3 that speeds up uploads to S3 but does not enhance database query performance.
Creating a read replica from the source DB instance allows the application to offload read traffic from the primary instance, thus improving performance by distributing the load. Read replicas can handle read queries, reducing contention on the primary instance.
Using Amazon Kinesis Data Firehose does not directly improve database performance. Kinesis is typically used for streaming data ingestion and processing, and while it can increase concurrency for data processing, it does not optimize database query performance or manage direct database traffic effectively.
I strategize that the answer is:
Create a read replica from the source DB instance. Serve read traffic from the read replica.