...7.4.3 数据库恢复（Database Recovery）7.4.4 闪回查询（Flashback Query）7.4.5 事务和回滚数据（Transactionsand Ulndo Data）7.4.6 回滚段（Undo Segment）7.4.7 回滚表空间（Undo Tablespace）7.4.8 回滚表空间的操作本章总结……
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原子事务、回滚和其它关键的数据库主题背后的理论非常类似于学生在操作系统中学习的问题。
The theory behind atomic transactions, rollbacks, and other critical database topics are very similar to the issues students study in operating systems.
这使得 DB2 的行为和预期的一样：扫描器一直等到 INSERT 事务提交或回滚，然后返回数据 —— 这和平常一样。
This makes DB2 behave as one would expect: the scanner waits until the INSERT transaction commits or rolls back and then return the data - business as usual.
WebSphere Application Server 3.0 中的企业 bean 现在支持具有跨多个 DB2 数据源完全两阶段提交和回滚能力的多个并发事务。
Enterprise beans in WebSphere Application Server 3.0 now support multiple concurrent transactions with full two-phase commit and rollback capabilities across multiple DB2 data sources.
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