当前位置：首页 > news >正文

flashback使用记录

news 来源：原创 2024/5/18 23:18:59

作者：gtlions 【转载时请以超链接心事标明文章出处和作者信息,谢谢.】

链接：http://blog.csdn.net/gtlions/archive/2010/03/29/5430076.aspx

今天中午同事误操作了一个动作，导致生产环境的550多条的业务数据丢失，折腾了10-15分钟把数据给恢复了。

晚上回到酒店在本机稍微小结和还原下操作过程，在此记录下。

Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.1.0
Connected as crmii

SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production

SQL> create table flashback_table_test1 (id number(4),name varchar2(10));

Table created

SQL> create table flashback_table_test2 as select * from flashback_table_test1 where 1=0;

Table created

SQL> insert into flashback_table_test1 values(1,'张三');

1 row inserted

SQL> insert into flashback_table_test1 values(2,'李四');

1 row inserted

SQL> insert into flashback_table_test1 values(3,'王五');

1 row inserted

SQL> insert into flashback_table_test2 select * from flashback_table_test1;

3 rows inserted

SQL> commit;

Commit complete

SQL> select sysdate from dual;

SYSDATE
-----------
2010/3/29 2

SQL> show parameter undo;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string AUTO
undo_retention integer 1800
undo_tablespace string UNDOTBS1

SQL>
SQL> select * from flashback_table_test1;

ID NAME
----- ----------
1 张三
2 李四
3 王五

SQL> select * from flashback_table_test2;

ID NAME
----- ----------
1 张三
2 李四
3 王五

SQL>

1、DELETE情况下的恢复

SQL> delete from flashback_table_test1;

3 rows deleted

SQL> commit;

Commit complete

SQL> select * from flashback_table_test1;

ID NAME
----- ----------

SQL> select * from flashback_table_test1 as of timestamp (sysdate-3/1440);

ID NAME
----- ----------
1 张三
2 李四
3 王五

SQL> insert into flashback_table_test1 select * from flashback_table_test1 as of timestamp (sysdate-3/1440);

3 rows inserted

SQL> commit;

Commit complete

SQL> select * from flashback_table_test1;

ID NAME
----- ----------
1 张三
2 李四
3 王五

SQL>

数据成功恢复。

2、Truncate情况下的恢复

SQL> truncate table flashback_table_test2;

Table truncated

SQL> select * from flashback_table_test2 as of timestamp (sysdate-3/1440);

select * from flashback_table_test2 as of timestamp (sysdate-3/1440)

ORA-01466: 无法读取数据 - 表定义已更改

SQL> select * from flashback_table_test2 as of timestamp (sysdate-2/1440);

select * from flashback_table_test2 as of timestamp (sysdate-2/1440)

ORA-01466: 无法读取数据 - 表定义已更改

SQL> select * from flashback_table_test2 as of timestamp (sysdate-1/1440);

select * from flashback_table_test2 as of timestamp (sysdate-1/1440)

ORA-01466: 无法读取数据 - 表定义已更改

SQL> flashback table flashback_table_test2 to before drop rename to test2_r;

Done

SQL> select * from test2_r;

ID NAME
---------- --------------------
2 test 2

SQL> drop table flashback_table_test2;

Table dropped

SQL> flashback table flashback_table_test2 to before drop rename to test2_r_2;

Done

SQL> select * from test2_r_2;

ID NAME
----- ----------

SQL>

恢复以失败告终；

3、Drop情况下恢复

SQL> select * from flashback_table_test1;

ID NAME
----- ----------
1 张三
2 李四
3 王五

SQL> drop table flashback_table_test1;

Table dropped

SQL> select * from flashback_table_test1;

select * from flashback_table_test1

ORA-00942: 表或视图不存在

SQL> flashback table flashback_table_test1 to before drop to rename flashback_table_test1_r;

flashback table flashback_table_test1 to before drop to rename flashback_table_test1_r

ORA-00933: SQL 命令未正确结束

SQL> flashback table flashback_table_test1 to before drop rename to flashback_table_test1_r;

Done

SQL> select * from flashback_table_test1_r;

ID NAME
----- ----------
1 张三
2 李四
3 王五

SQL>
数据也成功恢复。