How to restore/view the deleted records - Please help me on this regard

Question

Hi All,
Please help me in restore/view the deleted data.
I had removed 2 records from a table without back up and commited the same. Now I want to restore/view it, can you please guide me on this regard.
Oracle Version: 10g
OS: Windows XP
Database in Archive Mode.
With Regards,
Jamearon

Answer 1

Aman.... wrote:
<snip>
If all what you want is to view the data, you can use the Flashback's as of query which would enable you to go back either by SCN or by Timestamp. If you want to restore those rows back in the time( and losing the changes that has happened in that time ), you can use the Flashback Table option. An example of this is given below,
http://www.oracle-base.com/articles/10g/Flashback10g.php
HTH
Aman....As promised, here's one way to use flashback to restore the one deleted row without having to impact the rest of the table with a general FLASHBACK TABLE.
=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2011.01.23 15:17:56 =~=~=~=~=~=~=~=~=~=~=~=
login as: oracle
oracle@vmlnx01's password:
Last login: Sun Jan 23 15:13:10 2011 from 192.168.160.1
[oracle@vmlnx01 ~]$ sqlplus /nolog
SQL*Plus: Release 10.2.0.4.0 - Production on Sun Jan 23 15:18:11 2011
Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
SQL> @doit
SQL> col col_ts for a15
SQL> conn scott/tiger
Connected.
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod
PL/SQL Release 10.2.0.4.0 - Production
CORE10.2.0.4.0Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
5 rows selected.
SQL> --
SQL> alter session set nls_timestamp_format='hh24:mi:ss.FF';
Session altered.first we will create a test table and populate it. Pay close attention to the row identified by col_id=2
SQL> drop table flashtest;
Table dropped.
SQL> create table flashtest
  2   (col_id number(1),
  3    col_ts timestamp,
  4    col_txt varchar2(10)
  5   );
Table created.
SQL> --
SQL> insert into flashtest
  2    values (1, systimestamp, 'r1 v1');
1 row created.
SQL> commit;
Commit complete.
SQL> exec dbms_lock.sleep(5);
PL/SQL procedure successfully completed.
SQL> --
SQL> insert into flashtest
  2    values (2, systimestamp, 'r2 v1');
1 row created.
SQL> commit;
Commit complete.
SQL> exec dbms_lock.sleep(5);
PL/SQL procedure successfully completed.
SQL> --
SQL> insert into flashtest
  2    values (3, systimestamp, 'r3 v1');
1 row created.
SQL> commit;
Commit complete.
SQL> exec dbms_lock.sleep(5);
PL/SQL procedure successfully completed.
SQL> --
SQL> select * from flashtest;
    COL_ID COL_TS          COL_TXT
         1 15:18:14.896167 r1 v1
         2 15:18:21.841682 r2 v1
         3 15:18:28.772038 r3 v1
3 rows selected.
SQL> --
SQL> update flashtest
  2   set col_ts = systimestamp,
  3       col_txt = 'r2 v2'
  4   where col_id = 2;
1 row updated.
SQL> commit;
Commit complete.
SQL> select * from flashtest;
    COL_ID COL_TS          COL_TXT
         1 15:18:14.896167 r1 v1
         2 15:18:35.929847 r2 v2
         3 15:18:28.772038 r3 v1
3 rows selected.
SQL> exec dbms_lock.sleep(5);
PL/SQL procedure successfully completed.So at this point we can see that we have 3 rows, and row 2 has been modified from its original values.
Now we will delete that row.
SQL> --
SQL> delete from flashtest
  2  where col_id=2;
1 row deleted.
SQL> commit;
Commit complete.
SQL> --
SQL> select * from flashtest
  2  order by col_id;
    COL_ID COL_TS          COL_TXT
         1 15:18:14.896167 r1 v1
         3 15:18:28.772038 r3 v1
2 rows selected.Now let's do a SELECT...VERSIONS and see what flashback knows about the row.
SQL> --
SQL> select col_id,
  2         col_ts,
  3         col_txt,
  4         nvl(versions_startscn,0) START_SCN,
  5         versions_endscn END_SCN,
  6         versions_xid xid,
  7         versions_operation operation
  8  from flashtest
  9  versions between scn minvalue and maxvalue
10  where col_id=2
11  order by col_id, start_scn;
    COL_ID COL_TS          COL_TXT     START_SCN    END_SCN XID              O
         2 15:18:21.841682 r2 v1               0    2802287
         2 15:18:35.929847 r2 v2         2802287    2802292 0200260082060000 U
         2 15:18:35.929847 r2 v2         2802292            0A002300A4060000 D
3 rows selected.
SQL> --And having seen the above, we can use a more selective form to provide the values for an INSERT statement to put the row back.
SQL> insert into flashtest
  2     select col_id,
  3            col_ts,
  4            col_txt
  5     from flashtest
  6     versions between scn minvalue and maxvalue
  7     where col_id=2
  8       and versions_operation = 'D'
  9  ;
1 row created.
SQL> --
SQL> select * from flashtest
  2  order by col_id;
    COL_ID COL_TS          COL_TXT
         1 15:18:14.896167 r1 v1
         2 15:18:35.929847 r2 v2
         3 15:18:28.772038 r3 v1
3 rows selected.
SQL>One could also query FLASHBACK_TRANSACTION_QUERY to get the actual DML needed to UNDO an operation on a single table.