锁机制并发多版本

oracle锁机制的延续——并发与多版本1

Oracle选择了多版本机制，尽管更难实现，但绝对更具并发性。丢失更新：在采用共享读锁的数据库中，REPEATABLE READ的一个常见用途是防止丢失更新。在一个采用共享读锁（而不是多版本）的数据库中，如果启用了REPEATABLE READ，则不会发生...

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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