ORA-38788: More standby database recovery is needed
Cause: An attempt was made to create a restore point or a guaranteed while a physical standby database is not cleanly checkpointed.
Action: Perform more standby database recovery via managed standby database recovery. Cancel managed recovery and retry the command.
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1.收集错误日志，了解更多字段以及数据库当前的恢复状态。
2.确定需要的日志文件的类型、大小、存放位置，并将其拷贝回standby服务器。
3.使用recover standby database命令，将日志文件继续恢复回standby服务器。
4.最后使用alternate的recover managed standby database命令，来开启standby恢复。