文档解释
ORA-38758: cannot flashback data file string; restored since last recovery
Cause: An attempt to do FLASHBACK DATABASE found that the file was restored since the last standby recovery. The file cannot be flashed back.
Action: The file must be taken offline before continuing with the FLASHBACK DATABASE command.
答：
ORA-38758: cannot flashback data file string; restored since last recovery，这是一个Oracle数据库错误。
官方解释
常见案例
一般处理方法及步骤
(1)删除数据库中无用的恢复段。
(2)执行一次完整的媒体恢复，从而为你的数据库创建一个有效的备份集。
(3)在操作系统上重新启用闪回管理服务器。
(4)根据你的自定义时间点进行闪回操作，将数据库回滚到以前的某个状态。
