DML鎖（TX、TM鎖）和DDL鎖（排他、共享、可中斷解析鎖）基礎

DML鎖 DML鎖用於確保一次只有一我的能修改一行，並且這時別人不能刪除這個表。 1.TX鎖 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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