Sql 通过闪回查询回滚更新或删除数据

我已经做了一些更改并提交，但我想通过Flashback查询回滚这些更改

你能帮我怎么做吗

我使用的是Oracle 11g版本

我已经从下表中删除了数据。现在我想还原这些记录

顾客， 住址 受雇者 对齐

非常感谢你的帮助

苏尼塔。

有两件事

1.SCN的闪回

SELECT column_list
FROM table_name
AS OF SCN scn_number;

2.按时间戳倒叙

SELECT column_list
FROM table_name
AS OF TIMESTAMP TO_TIMESTAMP('the timestamp value');

要获取当前\u scn和systimestamp，请查询：

SELECT current_scn, SYSTIMESTAMP
FROM v$database;

根据OP要求更新示例

要将表闪回到旧scn，请使用

闪回表..To scn

子句

SQL> DROP TABLE string_ex PURGE;

Table dropped.

SQL> CREATE TABLE string_ex (sl_ps_code VARCHAR2(20) );

Table created.

SQL> INSERT INTO string_ex (sl_ps_code) VALUES ('AR14ASM0002');

1 row created.

SQL> INSERT INTO string_ex (sl_ps_code) VALUES ('AR14SFT0018');

1 row created.

SQL> INSERT INTO string_ex (sl_ps_code) VALUES ('AR14SFT0019');

1 row created.

SQL> INSERT INTO string_ex (sl_ps_code) VALUES ('AR14SFT0062');

1 row created.

SQL> COMMIT;

Commit complete.

SQL> SELECT current_scn, SYSTIMESTAMP FROM v$database;

         CURRENT_SCN SYSTIMESTAMP
-------------------- --------------------------------------------
      13818123201277 29-OCT-14 03.02.17.419000 PM +05:30

SQL> SELECT current_scn, SYSTIMESTAMP FROM v$database;

         CURRENT_SCN SYSTIMESTAMP
-------------------- --------------------------------------------
      13818123201280 29-OCT-14 03.02.22.785000 PM +05:30

SQL> SELECT current_scn, SYSTIMESTAMP FROM v$database;

         CURRENT_SCN SYSTIMESTAMP
-------------------- --------------------------------------------
      13818123201282 29-OCT-14 03.02.26.781000 PM +05:30

SQL> SELECT * FROM string_ex;

SL_PS_CODE
---------------
AR14ASM0002
AR14SFT0018
AR14SFT0019
AR14SFT0062

SQL>

表中有四行

SQL> ALTER TABLE string_ex ENABLE ROW MOVEMENT;

Table altered.

SQL>

需要移动行。

SQL> DELETE FROM string_ex WHERE ROWNUM =1;

1 row deleted.

SQL>
SQL> COMMIT;

Commit complete.

SQL>
SQL> SELECT * FROM string_ex;

SL_PS_CODE
---------------
AR14SFT0018
AR14SFT0019
AR14SFT0062

SQL> FLASHBACK TABLE string_ex TO SCN 13818123201277;

Flashback complete.

我现在删除了一行并提交了更改。

SQL> DELETE FROM string_ex WHERE ROWNUM =1;

1 row deleted.

SQL>
SQL> COMMIT;

Commit complete.

SQL>
SQL> SELECT * FROM string_ex;

SL_PS_CODE
---------------
AR14SFT0018
AR14SFT0019
AR14SFT0062

SQL> FLASHBACK TABLE string_ex TO SCN 13818123201277;

Flashback complete.

闪回已完成

SQL> SELECT * FROM string_ex;

SL_PS_CODE
---------------
AR14ASM0002
AR14SFT0018
AR14SFT0019
AR14SFT0062

SQL>

---

现在我的表已恢复到旧状态，行已返回

，但这仅给出计数..以及如何恢复这些更改..非常感谢您的帮助我已更新了我的答案<代码>闪回表..TO SCN是您需要的子句。看看答案。