Oracle10g的Flashback version Query

原创 eygle 2005-03-30

411

Oracle10g通过Flashback Version Query提供查看对数据库事务级改变的方法.

当闪回事务处理查询与闪回版本查询同时使用时，我们可以轻易地从用户或者应用程序错误恢复。

以下是闪回版本查询的示例:

1.执行DML操作



EYGLE  on 30-MAR-05 >create table t as select username,user_id from dba_users;
Table created.
EYGLE  on 30-MAR-05 >select * from t;
USERNAME                          USER_ID
------------------------------ ----------
SYSTEM                                  5
SYS                                     0
TEST                                   25
EYGLE                                  26
SCOTT                                  29
DIP                                    19
TRANS                                  27
TEST1                                  28
OPERATOR                               31
WMSYS                                  23
DBSNMP                                 22
USERNAME                          USER_ID
------------------------------ ----------
OUTLN                                  11
12 rows selected.
EYGLE  on 30-MAR-05 >delete from t where username='OUTLN';
1 row deleted.
EYGLE  on 30-MAR-05 >commit;
Commit complete.
EYGLE  on 30-MAR-05 >delete from t where username='TEST1';
1 row deleted.
EYGLE  on 30-MAR-05 >commit;
Commit complete.
EYGLE  on 30-MAR-05 >select * from t;
USERNAME                          USER_ID
------------------------------ ----------
SYSTEM                                  5
SYS                                     0
TEST                                   25
EYGLE                                  26
SCOTT                                  29
DIP                                    19
TRANS                                  27
OPERATOR                               31
WMSYS                                  23
DBSNMP                                 22
10 rows selected.
EYGLE  on 30-MAR-05 >update t set user_id=1 where username='EYGLE';
1 row updated.
EYGLE  on 30-MAR-05 >commit;
Commit complete.
EYGLE  on 30-MAR-05 >delete from t where user_id >10;
7 rows deleted.
EYGLE  on 30-MAR-05 >commit;
Commit complete.
EYGLE  on 30-MAR-05 >select * from t;
USERNAME                          USER_ID
------------------------------ ----------
SYSTEM                                  5
SYS                                     0
EYGLE                                   1
EYGLE  on 30-MAR-05 >insert into t values('PENNY',2); 
1 row created.
EYGLE  on 30-MAR-05 >commit;
Commit complete.
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Oracle10g的Flashback version Query

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