When a transaction containing DML on a tracked table commits, this process stores the pre-image of the rows into the Flashback Data Archive.

当在被追踪的表上面发生了dml事务的时候，这个进程存储行的前镜像到闪回数据归档里面。

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This data initializes the transaction table, dirty pages table, and open file table so they can be used in the recovery process.

这些数据将初始化事务表、脏页表和打开文件表，以便它们能够用于恢复过程。

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In transactions, the middleware USES 3-step handshake method, asynchronous process and confirm procedure (not the previous reverse table) to ensure the completeness of the transaction.

记账交易采用三次握于，使用确认过程，取消原来应用中的待冲正表，交易完整性由此中间件保证，记账程序采用异步处理方式。

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