This article explains how to use Amazon RDS Enhanced Monitoring to capture real-time OS metrics with granular precision for better database performance troubleshooting.

• Enhanced Monitoring provides sub-minute granularity (1-60 seconds) versus CloudWatch's standard 1-minute intervals
• Captures detailed OS-level metrics: CPU Nice, memory, disk I/O, network, swap, and process lists
• Stores metrics in CloudWatch Logs as JSON for integration with other AWS services
• Available for MySQL, MariaDB, PostgreSQL, Oracle, SQL Server, and Aurora databases
• Requires IAM role to send OS metrics to CloudWatch Logs; configurable via RDS console
• Demonstration showed Enhanced Monitoring detected 1,600 WriteIOPS versus CloudWatch's 530 IOPS
• Provides physical device metrics showing data striping across multiple volumes
• Complements CloudWatch and Performance Insights for comprehensive RDS monitoring

Enhanced Monitoring enables detection of sub-minute performance spikes missed by standard CloudWatch metrics, making it essential for detailed troubleshooting and performance analysis.