... Commited Oracle: Read Commited MySQL : Repeatable Read 附录一：Oracle的锁 Oracle锁分为两大类：数据锁（DML锁）和字典锁。字典锁包括语法分析锁和DDL锁，有DBMS控制，用户无权控制。
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在一个数据锁存如果LE是低，时钟是在高或低的逻辑电平举行。
The a data is latched if le is low and clock is held at a high or low logic level.
译码电路接收测量端模拟信号，转化为7段显示的数字信号，发送到数据锁存器上。
The A/D decoding circuit received simulation signal form measurement port and converted the signals into data signals which displayed by 7-segment, then signals were sent to data latch.
分析了处理并发事务时现有XML数据锁机制的问题，并提出了自己的XML数据上锁规则。
Analyze the current problems of using lock mechanism when deal with concurrency transactions of XML data.
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