ORA-38765: Flashed back database cannot be opened read-only.
Cause: A complete recovery was performed after a database flashback but the database was not opened for read-write access, or a FLASHBACK DATABASE command failed.
Action: If a complete recovery was performed after a database flashback, open the database for read-write access. If a FLASHBACK DATABASE command failed, fix what caused the command to fail and retry the command, or recover and open the database for read-write access.
这个Oracle数据库错误信息 ORA-38765: “Flashed back database cannot be opened read-only” 表明，当您试图将flashback database以只读模式打开时发生了一个错误。
（1）关掉警告： ALTER SYSTEM SET flashback_debug=’NOLOGGING’ SCOPE=SPFILE;
（2）检查Flashback log配置：SELECT Status, Flashback_Log_files FROM v$flashback_database_log;
（3）确保恢复文件路径(rman)：RMAN> CONFIGURE CONTROLFILE AUTOBACKUP ON;
（4）确保对应参数有效：_flashback_database_rollback_segments &_flashback_database_guarantee_timestamp &_flashback_database_high_recovery_availability;
（5）确保目录存在：ALTER DATABASE CREATE DATAFILE;
（6）检查所有文件：SELECT Log_mode, open_mode FROM V$DATABASE;
（7）尝试重新开启数据库：ALTER DATABASE OPEN READ WRITE;
（8）检查 Flashback 日志空间：SELECT * FROM V$FLASHBACK_DATABASE_LOG;
（9）打开一个新的数据库：ALTER DATABASE OPEN;
（10）启动 Flashback Database 功能：ALTER DATABASE FLASHBACK ON;