DML锁（TX、TM锁）和DDL锁（排他、共享、可中断解析锁）基础

DML锁 DML锁用于确保一次只有一我的能修改一行，并且这时别人不能删除这个表。 1.TX锁 A row lock, also called a TX lock, is alock on a single row of table. A transaction acquires a row lock for each rowmodified by an INSERT, UPDATE, DELETE

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