Database Deadlocks Explained: Causes, Detection, and Prevention
What a database deadlock is, why transactions lock each other out, how to detect deadlocks, and how to prevent them with lock ordering, timeouts, and retry.
Database Replication Lag: Causes, Monitoring, and Fixes
What database replication lag is, why it happens, and how to monitor and reduce it so replicas don't serve stale data or break your reads during failover.
Database Connection Pool Exhaustion: Causes and Fixes
Why apps hit 'too many connections', how connection pool exhaustion happens, and how to diagnose, size, and fix it before it takes your database down.
ActiveRecord Monitoring: N+1, Slow Queries & Pool Exhaustion
Detect ActiveRecord N+1 queries, slow SQL and pool exhaustion in Rails. Bullet, Prosopite, pg slow logs, Sidekiq pool sizing, and HTTP latency as canary.
PostgreSQL Production Monitoring: Slow Queries & Replication
Monitor PostgreSQL in production. pg_stat_statements, replication lag, autovacuum bloat, lock trees, connection pools, and alert thresholds.
Database Monitoring Guide: MySQL, PostgreSQL & Redis
Database downtime brings your entire application down. Learn how to monitor MySQL, PostgreSQL, and Redis uptime, connectivity, and performance from outside.