1、事务的隔离级别
2、InnoDB锁争用
【2.1】行锁查看:show status like 'innodb_row_lock'
如果锁争用比较高,比如 Innodb_row_lock_time 与 Innodb_row_lock_time_avg 比较高,可以查看【2.2】
【2.2】查看当前锁情况:select * from information_schema.innodb_locks \G
查看当前锁等待情况:select * from information_schema.innodb_lock_waits \G
【2.3】使用innodb_monitors来查看innodb情况
show engine innodb status \G