Commit the changes

Question

hi,
SQL> select *from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for IBM/AIX RISC System/6000: Version 10.2.0.4.0 - Productio
NLSRTL Version 10.2.0.4.0 - Production
SQL>
i have two session,
in session 1 i updated the table
SQL session1> select *from t;
         X
         1
         2
         3
         4
         5
SQL session1> update  t set x=x+10;
5 rows updated.
SQL> commit;
Commit complete.
SQL>  select *from t;
         X
        11
        12
        13
        14
        15
after that in session 2 , can i view the old records.even though the session 1 is commited the changes.
SQL> select *from t;
         X
         1
         2
         3
         4
         5
is it possible ??
thanks in advance.

Answer 1

Oracle uses undo to rollback transactions and supports flashback queries. To use the feature you must have the EXECUTE previlige on the DBMS_FLASHBACK package.
When you execute flashback query, only the state of the data is chagned. The current system time is used and the current data dictionary is used. If the structure of the table has changed, the query fail.
select *from t as of timestamp;