高性能mysql的笔记

1. 锁
   共享锁，排他锁
   
2. 四种隔离级别
   
   
3. 死锁
   
4. 事务日志
   
5. 大数据量
   
6. 慢日志配置
   show variables like ‘%slow_query_log%’;
   show variables like ‘long_query_time’;
   show variables like ‘%log_output%’;
   show variables like ‘log_slow_admin_statements’;
   show global status like ‘%slow_queries%’;