Oracle_052_lesson_p9

Managing Data Concurrency 管理并发 （锁）

you should be able to: Describe the locking mechanism and how Oracle manages data concurrency Monitor and resolve locking conflicts

exclusive row lock 行独占锁 table lock 表锁

deadlock 死锁，死锁能检测到ORA-00060错误 ，会中断检测到死锁语句的前一条语句，前一条语句自动执行rollback操作。 下图中9:15左边的操作会自动rollback;