诊断：ORA-38760: This database instance failed to turn on flashback database

$ oerr ora 38760

38760, 00000, "This database instance failed to turn on flashback database"

// *Cause: Database flashback is on but this instance failed to

//         start generating flashback data. Look in alert log for more

//         specific errors.

// *Action: Correct the error or turn off database flashback.

 

 

 

Solution A:

 

 

To Enable flashback:

 

 

1.Shutdown the database either in immediate or normal mode.

 

 

2.Mount the database.

 

 

3.Enable flashback.

 

 

SQL>Alter database flashback on;

 

 

4.Open the database.

 

 

Sometimes even after solution A you are still getting errors:

 

 

SQL> startup mount;

ORACLE instance started.

 

 

Total System Global Area 1.4798E+10 bytes

Fixed Size 2046472 bytes

Variable Size 671090168 bytes

Database Buffers 1.4110E+10 bytes

Redo Buffers 14729216 bytes

Database mounted.

SQL> alter database flashback off;

 

 

Database altered.

 

 

SQL> alter database open;

alter database open

*

ERROR at line 1:

ORA-38760: This database instance failed to turn on flashback database

 

 

SQL>

 

 

此时可以尝试方案B。

 

Solution B:

 

1. Startup mount.

 

 

2. Check db_recovery_file_dest parameter and ensure this directory exists.

 

 

3. Check restore points:

 

 

select NAME,SCN,GUARANTEE_FLASHBACK_DATABASE,DATABASE_INCARNATION# from v$restore_point;

 

 

4. Drop restore point:

 

 

drop restore point <restore point>;

 

 

5. alter database flashback off;

 

 

6. Shutdown immediate;

 

 

7. Startup