Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 175 discussion

Many applications, including those built on modern serverless architectures, can have a large number of open connections to the database server and may open and close database connections at a high rate, exhausting database memory and compute resources. Amazon RDS Proxy allows applications to pool and share connections established with the database, improving database efficiency and application scalability. https://aws.amazon.com/id/rds/proxy/

Option A (configuring provisioned concurrency and creating a global database) does not directly address the high connection utilization issue on the database, and creating a global database may introduce additional complexity without immediate benefit to solving the timeout errors. Option C (creating a read replica in a different AWS Region) introduces additional data replication and management complexity, which may not be necessary to address the timeout errors. Option D (migrating to Amazon DynamoDB) involves a significant change in the data storage technology and requires modifying the application to use DynamoDB instead of Aurora PostgreSQL. This may not be the most suitable solution when the goal is to make minimal changes to the application. Therefore, using Amazon RDS Proxy and modifying the Lambda function to use the RDS Proxy endpoint is the recommended solution to prevent timeout errors and reduce the impact on the database during peak loads.

Amazon RDS Proxy is a fully managed, highly available database proxy for Amazon Relational Database Service (RDS) that makes applications more scalable, more resilient to database failures, and more secure. B

Connection problems causing high CPU and Memory usage? Use RDS proxy!

Use Amazon RDS Proxy to create a proxy for the database. Modify the Lambda function to use the RDS Proxy endpoint instead of the database endpoint.

using Amazon RDS Proxy and modifying the Lambda function to use the RDS Proxy endpoint is the recommended solution to prevent timeout errors and reduce the impact on the database during peak loads.

I also think the answer is B. However can RDS Proxy be used with Amazon Aurora PostgreSQL database?

I expect a answer with database replica but there is not, so B is most suitable

Option B. Use Amazon RDS Proxy to create a proxy for the database. Modify the Lambda function to use the RDS Proxy endpoint instead of the database endpoint. Using Amazon RDS Proxy can help reduce the number of connections to the database and improve the performance of the application. RDS Proxy establishes a connection pool to the database and routes connections to the available connections in the pool. This can help reduce the number of open connections to the database and improve the performance of the application. The Lambda function can be modified to use the RDS Proxy endpoint instead of the database endpoint to take advantage of this improvement.

Option --- B

As it is mentioned that issue was due to high CPU and Memory due to many open corrections to DB, B is the right answer.

B Using Amazon RDS Proxy will allow the application to handle more connections and higher loads without timeouts, while making the least possible changes to the application. The RDS Proxy will enable connection pooling, allowing multiple connections from the Lambda function to be served from a single proxy connection. This will reduce the number of open connections on the database, which is causing high CPU and memory utilization

B is correct

B - Proxy to manage connections

Issue related to opening many connections and the solution requires least code changes so B satisfies the conditions

Correct B