ORA-38791: flashback did not start because file string was not in a valid incarnation ORACLE 报错 故障修复

文档解释

ORA-38791: flashback did not start because file string was not in a valid incarnation

Cause: Flashback could not be started because a file was checkpointed or fuzzy at a point where the file can neither be restored nor recovered to our restore target. In order for a file to be brought to the restore target, the file has to be in one of the incarnations along the ancestral path from the current incarnation to the restore incarnation.

Action: Manually restore or recover the file to a point where it is in one of the incarnations along the ancestral path from the current incarnation to the restore incarnation.

ORA-38791的正式定义是“闪回未启动，因为文件字符串未在有效的化身中”。此错误表明flashback功能在文件字符串中没有发现有效的文件标识(incarnation ID)，因此无法启动flashback操作。

常见案例

– 尝试闪回时存在标识已���失的文件，例如使用 alter database flashback on 命令激活闪回特性时出现；

– 尝试通过flashback 命令来撤销不存在的文件；

– 尝试使用备份脚本相关的可用数据库实例恢复数据文件时出现；

此错误的正常处理方法主要有以下3步：

1.确认Oracle数据库中是否包含以上提到的文件；

2.确保其对应的化身标识是否正确；

3.恢复数据文件至正确的实例。