MySQL 5.7

MySQL 5.7 key features
MySQL 5.7 JSON functions
MySQL 5.7 Optimizer Hints
Transporting tablespace from MySQL 5.6 to MySQL 5.7 (case study)
MySQL Default Configuration Changes between 5.6 and 5.7
MySQL 5.7 Performance Tuning Immediately After Installation - Percona Database Performance Blog
Learning MySQL 5.7: Q & A - Percona Database Performance Blog