Point-in-time rollback 基于时间点回滚
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。
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