一、锁
1、锁的介绍
2、全局锁
3、表级锁
1、表锁
2、元数据锁(meta data lock,MDL)
# 查看元数据锁
select object_type, object_schema, object_name, lock_type, lock_duration from performance_schema.metadata_locks;
3、意向锁
# 查看意向锁及行锁加锁情况
select object_schema, object_name, index_name, lock_type, lock_mode, lock_data from performance_schema.data_locks;
4、行级锁
1、行锁