Full Access Amazon Web Services SAP-C02 Tutorials

There are three core requirements: reduce/manage active database connections, keep communication private without internet exposure, and scale to many consumer accounts over time.

To manage and pool database connections to an Amazon RDS for PostgreSQL DB instance, the AWS-managed service designed for this purpose is Amazon RDS Proxy. RDS Proxy maintains a pool of database connections and multiplexes application connections onto fewer database connections. This reduces connection overhead on the database, improves resiliency during failovers, and helps control the number of active connections that reach the DB instance.

Next, the connectivity must be private across accounts and scalable as more consumer accounts are added. AWS PrivateLink provides scalable, private connectivity between VPCs and services across accounts without requiring VPC peering, transitive routing, or exposing traffic to the public internet. With PrivateLink, the database account can publish an endpoint service backed by a Network Load Balancer, and consumer accounts create interface endpoints in their VPCs to connect privately to that service. This is operationally scalable because adding new consumer accounts does not require managing a growing mesh of VPC peering relationships or complex route propagation; each consumer adds an interface endpoint.

Option B is the only option that addresses connection management by introducing RDS Proxy and uses PrivateLink to provide private, cross-account, scalable connectivity. The proxy endpoint being in private subnets aligns with the requirement that traffic stays private.

Option A is incorrect because a NAT gateway in a public subnet is used for outbound internet access from private subnets. It is not needed for private cross-account database access and introduces unnecessary public subnet components. Also, NAT gateways do not manage database connections. Transit gateway can provide private connectivity, but it does not address connection pooling, and the NAT gateway component is not appropriate for the stated requirement of avoiding internet exposure.

Option C is incorrect because an Application Load Balancer is not used to proxy raw PostgreSQL database traffic. PostgreSQL uses TCP, and ALB is primarily for HTTP/HTTPS and higher-layer routing. Also, VPC peering to each consumer VPC does not scale well as the number of accounts grows, and it creates operational overhead to manage many peering connections and route tables. It also does not manage DB connections.

Option D is incorrect because it uses VPC peering and NAT gateway. NAT gateway is again not the correct mechanism for private database access and does not provide connection pooling. VPC peering per consumer is not scalable and increases operational overhead.

Therefore, using RDS Proxy to manage connections and AWS PrivateLink (via an NLB-backed endpoint service) to provide private, scalable cross-account access is the correct solution.

Configuring the Aurora MySQL DB cluster to publish slow query and error logs to AmazonCloudWatch Logs will allow the solutions architect to monitor and troubleshoot the database performance by identifying slow or problematic queries1. CloudWatch Logs also provides features such as metric filters, alarms, and dashboards to analyze and visualize the log data2.

Implementing the AWS X-Ray SDK to trace incoming HTTP requests on the EC2 instances and implement tracing of SQL queries with the X-Ray SDK for Java will allow the solutions architect to measure and map the end-to-end latency and performance of the web application3. X-Ray traces show how requests travel through the application components, such as web servers, load balancers, microservices, and databases4. X-Ray also provides features such as service maps, annotations, histograms, and error rates to analyze and optimize the application performance.

Installing and configuring an Amazon CloudWatch Logs agent on the EC2 instances to send the Apache logs to CloudWatch Logs will allow the solutions architect to monitor and troubleshoot the web server performance by collecting and storing the Apache access and error logs. CloudWatch Logs also provides features such as metric filters, alarms, and dashboards to analyze and visualize the log data2.

Publishing Aurora MySQL logs to Amazon CloudWatch Logs

Working with log data in CloudWatch Logs

Instrumenting your application with the X-Ray SDK for Java

Tracing requests with AWS X-Ray

[Analyzing application performance with AWS X-Ray]

[Using CloudWatch Logs with your Apache web server]

Comprehensive and Detailed in Depth Explanation:

C is correct because Amazon EFS offers a scalable, elastic file system that can be mounted on both on-premises servers (via AWS Direct Connect or VPN) and EC2 instances. This allows real-time access to shared content with no migration downtime.

D is correct because AWS Snowball Edge Storage Optimized devices are designed for transferring petabyte-scale data (up to 80 TB per device). It’s a best practice for moving 200 TB of archival data when speed and bandwidth are constraints.