oracle锁机制并发多版本

oracle锁机制的延续——并发与多版本1

锁（lock）是Oracle管理共享数据库资源并发访问并防止并发数据库事务之间“相互干涉”的核心机制之一。总结一下，Oracle使用了多种锁，包括：TX锁：修改数据的事务在执行期间会获得这种锁。TM锁和DDL锁：在你修改一个对象的内容（对于TM锁...

oracle锁机制的延续——并发与多版本2

5、一致性读和当前读的深入理解：在CSDN里经常会遇到一些特别有学习劲头的朋友，有这样一个朋友，在学习Tom的经典书《oracle 9i/10g编程艺术》人民邮电出版的 P244-7.4 写一致在一致性读这里遇到些困惑，如下引用:create table t(x int,...

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