SQL Governance Middleware on AWS Multi-AZ implements a comprehensive query control plane spanning two availability zones with WAF, ALB, and API Gateway ingress protecting a governance engine that extracts query plans, estimates costs, and enforces policies before execution. Data flows through Query Submission Interface, Query Plan Extraction, Cost Estimation Engine, and Governance Engine, with execution monitoring and learning modules feeding metrics into RDS Aurora and DynamoDB policy stores. The architecture uses Step Functions for orchestration, SNS for alerts, SQS for async queuing, and integrates Snowflake, S3 query logs, Secrets Manager, and CloudTrail for comprehensive audit and compliance. This multi-AZ design ensures high availability and disaster recovery for mission-critical SQL governance, solving the challenge of preventing runaway queries, enforcing cost controls, and maintaining audit trails across distributed data platforms. Fork this diagram on Diagrams.so to customize subnets, add additional data sources, or adjust instance types for your governance requirements.