ORACLE 利用SCN恢复误delete的表

--kf是误删除的表

SQL> select count(*) from kf;

COUNT(*)

----------

3

SQL> delete from kf;

3 rows deleted

SQL> select count(*) from kg;

COUNT(*)

----------

0

--查询此时数据库的SCN

SQL>select dbms_flashback.get_system_change_number from dual;

GET_SYSTEM_CHANGE_NUMBER

------------------------

614215

SQL> select count(*) from kf as of scn 614215;

COUNT(*)

----------

0

--创建临时表test存放数据库的SCN

SQL> create table test(count int,scn int);

Table created

SQL> DECLARE

i INT:=614200;

BEGIN

FOR i IN 614200..614217 LOOP

INSERT INTO howard( SCN) VALUES (i );

UPDATE howard SET COUNT =(SELECT COUNT(*) FROM kg AS OF SCN i) WHERE SCN= i;

END LOOP ;

END ;

/

SQL> SELECT * FROM test

SQL> /

COUNT                                     SCN

--------------------------------------- ---------------------------------------

3                               614202

3                                 614203

3                                614204

0                                 614205

0                                 614206

--得到删除前数据库的SCN，恢复表数据

SQL>  select count(*) from kf  as of scn 614204;

COUNT(*)

----------

3

SQL> select count(*) from kg  as of scn 614205;

COUNT(*)

----------

0

SQL>insert into kf select * from kf as of scn 614204;

3 rows inserted