[oracle@ocmdb1 ~]$ sqlplus "/as sysdba"

SQL*Plus: Release 10.2.0.1.0 - Production on Wed May 18 08:46:00 2011

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> select flashback_on from v$database;

FLASHBACK_ON
------------------
NO

SQL> show parameter db_recover;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest                string
db_recovery_file_dest_size           big integer 0

SQL> show parameter db_flashback;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_flashback_retention_target integer 1440

SQL> alter system set db_recovery_file_dest='/u01/app/oracle/flash_recovery_area' scope=both;
alter system set db_recovery_file_dest='/u01/app/oracle/flash_recovery_area' scope=both
*
ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-01261: Parameter db_recovery_file_dest destination string cannot be
translated
ORA-01262: Stat failed on a file destination directory
Linux Error: 2: No such file or directory

SQL> alter system set db_recovery_file_dest='/u01/app/oracle/flash_recovery_area' scope=spfile;

System altered.

SQL> alter system set db_recovery_file_dest_size=1g scope=both;

System altered.

SQL> alter system set db_flashback_retention_target=2880 scope=both;

System altered.

SQL> show parameter db_recovery;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest                string
db_recovery_file_dest_size           big integer 1G

SQL> show parameter db_flash

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_flashback_retention_target integer 2880

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> startup mount;
ORA-01261: Parameter db_recovery_file_dest destination string cannot be translated
ORA-01262: Stat failed on a file destination directory
Linux Error: 2: No such file or directory

SQL> shutdown immediate;
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory

SQL> !

[oracle@ocmdb1 ~]$ cd /u01/app/oracle
[oracle@ocmdb1 oracle]$ ls -rtl
total 40
drwxr-xr-x 3 oracle oinstall 4096 May 15 11:29 product
drwxrwx--- 6 oracle oinstall 4096 May 15 20:36 oraInventory
drwxr-xr-x 3 oracle oinstall 4096 May 18 07:59 admin
drwxr-xr-x 3 oracle oinstall 4096 May 18 08:00 oradata
drwxr-xr-x 2 oracle oinstall 4096 May 18 08:42 rmanbak

[oracle@ocmdb1 oracle]$ mkdir flash_recovery_area
[oracle@ocmdb1 oracle]$ ls -rtl
total 48
drwxr-xr-x 3 oracle oinstall 4096 May 15 11:29 product
drwxrwx--- 6 oracle oinstall 4096 May 15 20:36 oraInventory
drwxr-xr-x 3 oracle oinstall 4096 May 18 07:59 admin
drwxr-xr-x 3 oracle oinstall 4096 May 18 08:00 oradata
drwxr-xr-x 2 oracle oinstall 4096 May 18 08:42 rmanbak
drwxr-xr-x 2 oracle oinstall 4096 May 18 08:58 flash_recovery_area

SQL> startup mount;
ORACLE instance started.

Total System Global Area 314572800 bytes
Fixed Size                  1219184 bytes
Variable Size             100664720 bytes
Database Buffers          209715200 bytes
Redo Buffers                2973696 bytes
Database mounted.

SQL> alter database flashback on;

Database altered.

SQL> alter database open;

Database altered.

SQL> select flashback_on from v$database;

FLASHBACK_ON
------------------
YES

SQL> show parameter db_recovery;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest                string      /u01/app/oracle/flash_recovery
                                                 _area
db_recovery_file_dest_size           big integer 1G

SQL> show parameter db_flash;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_flashback_retention_target integer 2880

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