Why MySQL 5.6 → 5.7 Upgrades Fail and How to Prevent Rollbacks
The article recounts a legacy project that relied on MySQL 5.6, explains common pitfalls of that version such as replication lag, heavy performance_schema overhead, binlog issues, and memory limits, then details why an upgrade to 5.7 was rolled back due to syntax changes, case‑sensitivity differences, and unresolved configuration problems.
