Database Deadlocks: Causes, Detection, and Prevention
Understand database deadlocks, inspect PostgreSQL and MySQL lock waits, prevent cycles with deterministic lock order, and retry aborted transactions safely.
Database Replication Lag: Measure, Diagnose, and Reduce It
Measure replication lag correctly in PostgreSQL, MySQL, and MongoDB; diagnose network, apply, I/O, and workload bottlenecks; protect stale reads and failover.
Database Connection Pool Exhaustion: Diagnose and Fix It
Diagnose database connection pool exhaustion, distinguish client wait timeouts from server limits, size pools across replicas, and fix leaks safely.
Active Record Performance Monitoring: N+1, SQL, and Pools
Monitor Active Record query count, N+1 lazy loads, slow SQL, object instantiation, and connection pool waits using Rails instrumentation and database evidence.
PostgreSQL Monitoring: Slow Queries, Locks, Vacuum, Replication
Monitor PostgreSQL with pg_stat_statements, pg_stat_activity, WAL lag, vacuum progress, locks, I/O, and workload-based production alerts.
Database Monitoring: MySQL, PostgreSQL, and Redis
Build database monitoring for MySQL, PostgreSQL, and Redis with safe connectivity checks, query probes, saturation metrics, and actionable alerts.