A. 排它锁(Exclusive Locks,简称X锁) B. 共享锁(Share Locks,简称S锁) C. IX锁 D. IS锁 E. SIX锁
A. 事务故障 B. 丢失修改(Lost Update) C. 不可重复读(Non-Repeatable Read) D. 读“脏”数据(Dirty Read)