consistent whole database backup 一致性数据库完全备份
A consistent backup is achieved when no data is changed between the start and the end of the backup process.
如果在备份过程期间数据没有发生变化，那么就能够获得一致的备份。
Furthermore, every change to any session also creates work for every node, because it has to process an incoming update message and make its backup copy of the session consistent with the changes.
而且，对会话的每次变化都会形成对每个节点的操作，因为节点必须处理进来的消息更新，让会话的备份拷贝与变化一致。
Finally, online backup images of databases and table Spaces will include the set of log files necessary to restore and recover the backup image to a consistent point in time.
最后，数据库和表空间的在线备份镜像将包括一组日志文件，在将备份镜像恢复到某个一致的时间点时，这些文件是必需的。
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