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
exclusiverowlock行独占锁
tablelock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;
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