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;
原文：http://blog.51cto.com/3938853/2162775