2010年
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[OCA042]第八章管理一致性与并发性
数据库恢复：当出现实例故障时，联机重做日志文件把已提交和未提交的事务前滚（roll forward）到实例故障发生点之后，撤销表空间中的撤销数据用来回退未提交事务。****************...
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[OCA]042-Managing Undo Data
The process of committing entails a verification that the changes in the transaction have been written to the redo log file, which is persistent storage on the disk, as opp...
