Oracle_052_lesson_p9

Posted 2020-12-31

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;