This document provides examples of using various Oracle Database flashback features including: 1) Flashback at the table level to before a drop, to a specific System Change Number (SCN), and to a timestamp. 2) Creating restore points and flashing back a table to a specific restore point. 3) Flashing back the entire database to a timestamp or SCN using Flashback Database.

1. Anar Godjaev
FLASHBACK (Practical test)
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 184549376 bytes
Fixed Size
1300928 bytes
Variable Size
157820480 bytes
Database Buffers
25165824 bytes
Redo Buffers
262144 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter system set DB_FLASHBACK_RETENTION_TARGET=4320;
System altered.
SQL> alter system set DB_RECOVERY_FILE_DEST_SIZE=536870912;
System altered.
SQL> alter system set DB_RECOVERY_FILE_DEST='/home/oracle/flash';
System altered.
SQL> alter database flashback on;
Database altered.

2. Anar Godjaev
SQL> alter database open;
Database altered.
SQL> select flashback_on from v$database;
FLASHBACK_ON
-----------YES
FLASHBACK (DROP TABLE)
CMD > sqlplus hr/hr
SQL> create table test_table(
id number(2),
name varchar2(30)
);
Table created.
SQL> insert into test_table values (1, 'Ben Rockwood');
1 row created.
SQL> insert into test_table values (2, 'Tamarah Rockwood');
1 row created.
SQL> insert into test_table values (3, 'Nova Rockwood');
1 row created.
SQL> insert into test_table values (4, 'Hunter Rockwood');
insert into test_table values (5, 'ddddter Rockwood');
1 row created.
SQL> select * from test_table;

3. Anar Godjaev
ID NAME
---------- -----------------------------1 Ben Rockwood
2 Tamarah Rockwood
3 Nova Rockwood
4 Hunter Rockwood
SQL> drop table test_table;
Table dropped.
SQL> select * from test_table;
select * from test_table
*
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> select * from recyclebin;
SQL> show recyclebin;
SQL> flashback table test_table to before drop;
Flashback complete.
SQL> select * from test_table;
ID NAME
---------- -----------------------------1 Ben Rockwood
2 Tamarah Rockwood
3 Nova Rockwood
4 Hunter Rockwood
SQL> drop table test_table purge;
Table dropped.
SQL> select * from test_table;

4. Anar Godjaev
select * from test_table
*
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> select * from recyclebin;
SQL> show recyclebin;
SQL> alter system set "_recyclebin"=FALSE;
FLASHBACK (SCN)
CMD > sqlplus hr/hr
SQL> CREATE TABLE flashback_table_test (
id NUMBER(10)
);
SQL> ALTER TABLE flashback_table_test ENABLE ROW MOVEMENT;
SQL> SELECT current_scn FROM v$database;
CURRENT_SCN
----------933716
SQL> INSERT INTO flashback_table_test (id) VALUES (1);
SQL> INSERT INTO flashback_table_test (id) VALUES (2);
SQL> COMMIT;
SQL> SELECT current_scn FROM v$database;
CURRENT_SCN
----------934423

5. Anar Godjaev
SQL> SELECT * FROM flashback_table_test;
ID
----------1
2
SQL> INSERT INTO flashback_table_test (id) VALUES (3);
SQL> INSERT INTO flashback_table_test (id) VALUES (4);
SQL> COMMIT;
SQL> SELECT current_scn FROM v$database;
CURRENT_SCN
----------934474
SQL> SELECT * FROM flashback_table_test;
ID
----------1
2
3
4
SQL> FLASHBACK TABLE flashback_table_test TO SCN 934423;
SQL> SELECT COUNT(*) FROM flashback_table_test;
COUNT(*)
---------2
SQL> FLASHBACK TABLE flashback_table_test TO SCN 934474;

6. Anar Godjaev
SQL> SELECT COUNT(*) FROM flashback_table_test;
COUNT(*)
---------4
SQL> FLASHBACK TABLE flashback_table_test TO SCN 933716;
SQL> SELECT COUNT(*) FROM flashback_table_test;
COUNT(*)
---------4
FLASHBACK (TIME)
CMD > sqlplus hr/hr
SQL> CREATE TABLE t3
ENABLE ROW MOVEMENT AS
SELECT owner, table_name, tablespace_name
FROM all_tables
WHERE 1=2;
SQL> desc t
SQL> SELECT table_name, row_movement
FROM user_tables;
SQL> SELECT current_scn, SYSTIMESTAMP
FROM gv$database;
CURRENT_SCN
----------SYSTIMESTAMP
--------------------------------------------------------------------------935085

7. Anar Godjaev
10-MAR-12 10.30.40.360096 AM +02:00
SQL> INSERT INTO t3
SELECT owner, table_name, tablespace_name
FROM all_tables
WHERE owner = 'SYS';
SQL> COMMIT;
SQL> SELECT current_scn, SYSTIMESTAMP
FROM gv$database;
CURRENT_SCN
----------SYSTIMESTAMP
--------------------------------------------------------------------------935177
10-MAR-12 10.32.18.675106 AM +02:00
SQL> INSERT INTO t3
SELECT owner, table_name, tablespace_name
FROM all_tables
WHERE owner = 'HR';
SQL> COMMIT;
SQL> SELECT current_scn, SYSTIMESTAMP
FROM gv$database;
CURRENT_SCN
----------SYSTIMESTAMP
--------------------------------------------------------------------------935196
10-MAR-12 10.32.57.849132 AM +02:00
SQL> INSERT INTO t3
SELECT owner, table_name, tablespace_name
FROM all_tables
WHERE owner = 'CTXSYS';
SQL> COMMIT;

8. Anar Godjaev
SQL> SELECT current_scn, SYSTIMESTAMP
FROM gv$database;
CURRENT_SCN
----------SYSTIMESTAMP
--------------------------------------------------------------------------935239
10-MAR-12 10.33.36.687213 AM +02:00
SQL> SELECT owner, COUNT(*)
FROM t3
GROUP BY owner;
OWNER
COUNT(*)
------------------------------ ---------HR
10
CTXSYS
5
SYS
27
SQL> FLASHBACK TABLE t3 TO TIMESTAMP
TO_TIMESTAMP('10/03/2012 10:40:00','dd/mm/yyyy hh24:mi:ss');
SQL> SELECT owner, COUNT(*)
FROM t3
GROUP BY owner;
SQL> FLASHBACK TABLE t3 TO TIMESTAMP
TO_TIMESTAMP('07/02/2011 19:31:22','dd/mm/yyyy hh24:mi:ss');
SQL> SELECT owner, COUNT(*)
FROM t3
GROUP BY owner;
SQL> FLASHBACK TABLE t3 TO TIMESTAMP
TO_TIMESTAMP('07/02/2011 19:33:55','dd/mm/yyyy hh24:mi:ss');
SQL> SELECT owner, COUNT(*)
FROM t3
GROUP BY owner;
FLASHBACK (POINT)
CMD > sqlplus hr/hr
SQL> CREATE TABLE t2
ENABLE ROW MOVEMENT AS
SELECT owner, table_name, tablespace_name

9. Anar Godjaev
FROM all_tables
WHERE 1=2;
SQL> desc t2
SQL> SELECT table_name, row_movement
FROM user_tables;
SQL> CREATE RESTORE POINT zero;
SQL> INSERT INTO t2
SELECT owner, table_name, tablespace_name
FROM all_tables
WHERE owner = 'SYS';
SQL> COMMIT;
SQL> CREATE RESTORE POINT one;
SQL> INSERT INTO t2
SELECT owner, table_name, tablespace_name
FROM all_tables
WHERE owner = 'WMSYS';
SQL> COMMIT;
SQL> CREATE RESTORE POINT two;
SQL> INSERT INTO t2
SELECT owner, table_name, tablespace_name
FROM all_tables
WHERE owner = 'CTXSYS';
SQL> COMMIT;
SQL> SELECT owner, COUNT(*)
FROM t2
GROUP BY owner;

10. Anar Godjaev
SQL> SELECT scn, time, name
FROM gv$restore_point;
SQL> FLASHBACK TABLE t2 TO RESTORE POINT two;
SQL> SELECT owner, COUNT(*)
FROM t2
GROUP BY owner;
SQL> FLASHBACK TABLE t2 TO RESTORE POINT one;
SQL> SELECT owner, COUNT(*)
FROM t2
GROUP BY owner;
SQL> FLASHBACK TABLE t2 TO RESTORE POINT zero;
SQL> SELECT owner, COUNT(*)
FROM t2
GROUP BY owner;
FLASHBACK (DATABASE)
CMD > sqlplus hr/hr
SQL> create table test_table2(
id number(2),
name varchar2(30)
);
Table created.
SQL> insert into test_table values (1, 'Ben Rockwood');
1 row created.
SQL> insert into test_table values (2, 'Tamarah Rockwood');
1 row created.

11. Anar Godjaev
SQL> insert into test_table values (3, 'Nova Rockwood');
1 row created.
SQL> insert into test_table values (4, 'Hunter Rockwood');
1 row created.
SQL> select * from test_table;
ID NAME
---------- -----------------------------1 Ben Rockwood
2 Tamarah Rockwood
3 Nova Rockwood
4 Hunter Rockwood
SQL> CONN sys/password AS SYSDBA;
SQL> SHUTDOWN IMMEDIATE;
SQL> STARTUP MOUNT EXCLUSIVE;
SQL> FLASHBACK DATABASE TO TIMESTAMP SYSDATE-(1/24/12); // 5 minutes earlier to
SQL> ALTER DATABASE OPEN RESETLOGS;
SQL> CONN hr/hr
SQL> select * from test_table;
FLASHBACK DATABASE TO TIMESTAMP my_date;
FLASHBACK DATABASE TO BEFORE TIMESTAMP my_date;
FLASHBACK DATABASE TO SCN my_scn;
FLASHBACK DATABASE TO BEFORE SCN my_scn;