The lowest isolation level , read uncommitted , may retrieve data that has been modified but not committed by other transactions 最低隔离级别（未提交读）可以检索其他事务已经修改、但未提交的数据。
Saving of data - partially completed return can be saved and retrieved for amendment and further completion within 1 month 储存资料-系统暂存未提交的报税表资料，市民可在一个月内作出修改和继续填报。
The new principal server rolls back any uncommitted transactions and brings its copy of the database online as the principal database 新的主体服务器回滚所有未提交的事务并使其数据库副本作为主体数据库在线。
The undo phase , which is the first part of recovery , rolls back any uncommitted transactions and makes the database available to users 撤消阶段（恢复的第一部分）将回滚任何未提交的事务并使数据库可供用户使用。
This is possible because the transactions that were uncommitted when the crash occurred reacquire any locks they held before the crash 这是可能的，因为崩溃发生时未提交的事务重新获得它们在崩溃前所持有的所有锁。
Fast recovery is possible because transactions that were uncommitted when the crash occurred reacquire whatever locks they held before the crash 出现这种情况是因为发生崩溃时未提交的事务重新获得了崩溃前持有的锁。
At this point , it is guaranteed that there are no transactions that appear as committed in one log , but not committed in another log 此点保证不存在这样的事务：在一个日志中显示为已提交，在另一个日志中显示为未提交。
This generally occurs when the valid values or the default value of a parameter is query - based and dependencies exist that have not been submitted to the 这通常出现在参数的有效值或默认值是基于查询的，且存在未提交到
