Circuit Breaking at the Database Layer: Stopping SQL Cascades Before They Spread

A single slow SQL query can trigger a cascading failure across an entire service by exhausting the connection pool. Traditional circuit breakers like Resilience4j operate at the endpoint level and cannot detect SQL-level faults, leaving services vulnerable to query-driven outages. Implementing circuit breaking at the MyBatis interceptor layer, keyed by SQL type and fingerprint, enables fine-grained fault isolation that protects the database before the entire service collapses.