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。
2
It not only used pre-image computation to avoid false negative, but also incorporated reachable states and unreachable states in the verification process.
除了利用原像计算避免误判之外，该算法还将可达状态和不可达状态引入到验证过程中。
3
As mentioned earlier, you can either use a pre-installed disk image or prepare a disk image for a fresh installation.