Database Insights

MariaDB and MySQL have diverged significantly. This guide compares licensing, Galera vs Group Replication, thread pool, cloud support, and migration paths.

Systematically diagnose MySQL replication lag: single-threaded applier, large transactions, missing replica indexes. Enable parallel replication and use pt-heartbeat.

Understand InnoDB crash recovery mechanics and handle edge cases with innodb_force_recovery. Emergency dump procedures and durability settings to prevent future crashes.

Systematically diagnose and fix MySQL 'Too many connections' errors. Learn to identify connection leaks, tune wait_timeout, and implement ProxySQL pooling.

Configure ProxySQL for transparent read/write splitting, connection pooling, and replication lag monitoring. Covers query rules, hostgroups, and stats analysis.

Error 1213 fires 400 times per hour and your application retries hide it. Learn to read SHOW ENGINE INNODB STATUS deadlock output, identify lock ordering violations, and eliminate the patterns causing them.

MySQL 8.4 LTS removes variables, enforces new replication defaults, and ships changed InnoDB settings that can silently break 8.0 configurations. This production checklist covers every item to verify before upgrading.

Your MySQL instance is at 80% CPU and nobody knows which query is responsible. Learn to enable the slow query log, analyze it with pt-query-digest, and fix the top patterns causing CPU and I/O saturation.

MySQL 8.0 end-of-life is April 2026. Plan your upgrade to MySQL 8.4 LTS now. Learn migration strategies, new features, and compatibility considerations.

MySQL offers multiple replication topologies — traditional async replication, semi-sync, Group Replication, and InnoDB Cluster. Understanding the trade-offs determines whether your failover takes seconds or minutes.

MySQL transmits data in plaintext by default, exposing passwords and query results to network interception. Here's how to configure SSL/TLS for MySQL — from certificate generation to enforcing encrypted connections.

ProxySQL pools thousands of application connections into a small backend pool, splits reads to replicas automatically, and lets you change routing without touching application code or restarting MySQL.