It might not perform any write operations, because we haven't gotten to the point in the protocol where the database guarantees being able to commit or rollback (see step 12).
因为我们在协议中没有数据库保证能提交或回滚(参阅步骤12)这一点，所以数据库可以不执行任何写人操作。
Backups at each stage of your migration enable you to rollback to a specific point in time of your migration process.
通过在迁移的每个阶段都进行备份，您可以回滚到迁移过程中的任何特定时点。
Finally, the XAResource receives a commit or rollback, at which point it should harden or undo the work that has been performed.
最后，XAResource接收commit或rollback，这时它应当提交或取消已经执行的工作。
Comodo time Machine (CTM) is a powerful system rollback utility that allows users to quickly restore their computers to an earlier point in time.
魔岛时间机器(澳门电讯)是一个功能强大的系统恢复工具，允许用户，尽快恢复他们的电脑的时间到一个较早点。
However, we can also rollback the current transaction, resetting the state of our database to the last commit point.
不过，我们也可以回滚当前事务，恢复到最后一次事务提交前的状态。
However, we can also rollback the current transaction, resetting the state of our database to the last commit point.
不过，我们也可以回滚当前事务，恢复到最后一次事务提交前的状态。
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