DMLlock

The purpose of a DML lock, also called a data lock, is to guarantee the integrity of data being accessed concurrently by multiple users. For example, a DML ...

DML Locks Library cache pins and the associated row cache enqueue locks protect object definitions for the duration of parse and execute calls.

A DML lock is a lock obtained on a table that is undergoing a DML operation (insert, update, delete). The DML_LOCKS value should equal the grand total of ...

The other aspects of locks are the Data Definition (DDL) and Data Manipulation (DML) locks. The views DBA_DML_LOCKS and DBA_DDL_LOCKS are both created by ...

The TM (DML enqueue lock) is a general table lock. Every time a session wants to lock a table (for an UPDATE, INSERT, or DELETE), a TM enqueue is requested.

2015年1月8日 — DML锁，也叫做数据锁（data lock），用于保证在多用户操作数据时数据的完整。DML锁防止相互冲突的DML和DDL操作同时发生。 DML锁有行锁（Row ...

2011年4月14日 — Oracle的鎖分為兩大類：資料鎖（也稱DML鎖）和字典鎖。字典鎖是Oracle DBMS內部用於對字典表的封鎖。字典鎖包括語法分析鎖和DDL鎖，由DBMS在必要的時候 ...

資料鎖定保護資料。其中包括了表格鎖定與列鎖定。表格鎖定鎖住整個表格，列鎖定鎖定了所選定的列。資料鎖定亦稱為DML鎖定(DML Lock)。

2016年3月27日 — 一、摘要Oracle的手册上关于锁的分类说明如下： 1. DML锁：Date lock。执行DML时保护数据的锁。Row Lock（TX）保护特定行，Table Lock（TM）保护整个 ...