oracle进行表数据恢复
1、建表
-- Create table
create table DARCY
(
ID NUMBER,
INFO NVARCHAR2(32)
)
tablespace DATA_SGPM
pctfree 10
initrans 1
maxtrans 255
storage
(
initial 64K
minextents 1
maxextents unlimited
);
2、插入数据
insert into "SGPM"."DARCY"("ID","INFO") values ('1','aaa');
insert into "SGPM"."DARCY"("ID","INFO") values ('2','bbb');
insert into "SGPM"."DARCY"("ID","INFO") values ('3','ccc');
3、删除数据
SQL> select * from darcy;
ID INFO
---------- --------------------------------------------------------------------------------
1 aaa
2 bbb
3 ccc
SQL> delete from darcy where id = 1;
1 row deleted
SQL> commit;
Commit complete
SQL> select * from darcy;
ID INFO
---------- --------------------------------------------------------------------------------
2 bbb
3 ccc
4、恢复数据
方法1：
查询最新的系统变更number
SQL> select dbms_flashback.get_system_change_number from dual;
GET_SYSTEM_CHANGE_NUMBER
------------------------
18144344
查看此次变更后的表记录
SQL> select * from darcy as of scn 18144344;
ID INFO
---------- --------------------------------------------------------------------------------
2 bbb
3 ccc
说明这是删除数据后的表记录，我们只要找到某个scn，即删除表记录前的scn，
恢复到这个scn时的记录。
SQL> SELECT * FROM DARCY as of scn 18144252;
ID INFO
---------- --------------------------------------------------------------------------------
1 aaa
2 bbb
3 ccc
然后直接执行insert语句
方法2：
SQL> select * from flashback_transaction_query where table_name='DARCY';
XID START_SCN START_TIMESTAMP COMMIT_SCN COMMIT_TIMESTAMP LOGON_USER UNDO_CHANGE# OPERATION TABLE_NAME TABLE_OWNER ROW_ID UNDO_SQL
---------------- ---------- --------------- ---------- ---------------- ------------------------------ ------------ -------------------------------- -------------------------------------------------------------------------------- -------------------------------- ------------------- --------------------------------------------------------------------------------
07001500AB280000 18144149 2010-9-9 10:14: 18144281 2010-9-9 10:17:1 SGPM 1 DELETE DARCY SGPM AAAYQwAAcAAAKk2AAA insert into "SGPM"."DARCY"("ID","INFO") values ('1','aaa');
080018005F370000 18144244 2010-9-9 10:16: 18144252 2010-9-9 10:16:3 SGPM 1 INSERT DARCY SGPM AAAYQwAAcAAAKk2AAC delete from "SGPM"."DARCY" where ROWID = 'AAAYQwAAcAAAKk2AAC';
080018005F370000 18144244 2010-9-9 10:16: 18144252 2010-9-9 10:16:3 SGPM 2 INSERT DARCY SGPM AAAYQwAAcAAAKk2AAB delete from "SGPM"."DARCY" where ROWID = 'AAAYQwAAcAAAKk2AAB';
080018005F370000 18144244 2010-9-9 10:16: 18144252 2010-9-9 10:16:3 SGPM 3 INSERT DARCY SGPM AAAYQwAAcAAAKk2AAA delete from "SGPM"."DARCY" where ROWID = 'AAAYQwAAcAAAKk2AAA';
执行UNDO_SQL，即：insert into "SGPM"."DARCY"("ID","INFO") values ('1','aaa');即可恢复数据。
或者直接运行：
SQL> flashback table DARCY to timestamp to_timestamp('2010-9-9 10:16:3','yyyy-mm-dd hh24:mi:ss');
flashback table DARCY to timestamp to_timestamp('2010-9-9 10:16:3','yyyy-mm-dd hh24:mi:ss')
ORA-08189: 因为未启用行移动功能, 不能闪回表
SQL> alter table DARCY enable row movement;
Table altered
SQL> flashback table DARCY to timestamp to_timestamp(2010-9-9 10:17:1,'yyyy-mm-dd hh24:mi:ss');
Done
SQL> SELECT * FROM DARCY;
ID INFO
---------- --------------------------------------------------------------------------------
1 aaa
2 bbb
3 ccc
5、drop表后的恢复
SQL> drop table darcy;
Table dropped
SQL> select * from darcy;
select * from darcy
ORA-00942: 表或视图不存在
SQL> select * from recyclebin;
OBJECT_NAME ORIGINAL_NAME OPERATION TYPE TS_NAME CREATETIME DROPTIME DROPSCN PARTITION_NAME CAN_UNDROP CAN_PURGE RELATED BASE_OBJECT PURGE_OBJECT SPACE
------------------------------ -------------------------------- --------- ------------------------- ------------------------------ ------------------- ------------------- ---------- -------------------------------- ---------- --------- ---------- ----------- ------------ ----------
BIN$CrbfFp0nRTWzETrAMvbD+A==$0 DARCY DROP TABLE DATA_SGPM
SQL> SELECT * FROM USER_RECYCLEBIN;
OBJECT_NAME ORIGINAL_NAME OPERATION TYPE TS_NAME CREATETIME DROPTIME DROPSCN PARTITION_NAME CAN_UNDROP CAN_PURGE RELATED BASE_OBJECT PURGE_OBJECT SPACE
------------------------------ -------------------------------- --------- ------------------------- ------------------------------ ------------------- ------------------- ---------- -------------------------------- ---------- --------- ---------- ----------- ------------ ----------
BIN$CrbfFp0nRTWzETrAMvbD+A==$0 DARCY DROP TABLE DATA_SGPM 2010-09-09:10:15:50 2010-09-09:11:12:04 18154031 YES YES 99376 99376 99376 8
SQL> flashback table darcy to before drop;
Done
SQL> select * from darcy;
ID INFO
---------- --------------------------------------------------------------------------------
1 aaa
2 bbb
3 ccc