flashback database（drop tablespace）

1、首先记录时间

select to_char(systimestamp,'yyyy-mm-dd HH24:MI:SS') from dual;--2014-04-25 13:55:48

查看表
select * from test1

删除表空间
drop tablespace test1 including contents and datafiles

2、开始flashback database

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.

Total System Global Area 935329792 bytes
Fixed Size 1222696 bytes
Variable Size 272631768 bytes
Database Buffers 654311424 bytes
Redo Buffers 7163904 bytes
Database mounted.
SQL> flashback database to timestamp to_timestamp('2014-04-25 13:55:48','yyyy-mm-dd HH24:MI:SS');
flashback database to timestamp to_timestamp('2014-04-25 13:55:48','yyyy-mm-dd HH24:MI:SS')
*
ERROR at line 1:
ORA-38795: warning: FLASHBACK succeeded but OPEN RESETLOGS would get error
below
ORA-01245: offline file 7 will be lost if RESETLOGS is done
ORA-01111: name for data file 7 is unknown - rename to correct file
ORA-01110: data file 7: '/u01/app/oracle/product/10.2/db_1/dbs/UNNAMED00007'

恢复的时候报错

SQL> alter database create datafile 7 as '/u01/app/oracle/test11.dbf';      #创建数据文件

Database altered.

SQL> recover datafile 7;                                            #按道理是要recover一次
ORA-00283: recovery session canceled due to errors
ORA-38798: Cannot perform partial database recovery
ORA-38797: Full database recovery required after a database has been flashed
back

再次flashback databae直接成功了
SQL> flashback database to timestamp to_timestamp('2014-04-25 13:55:48','yyyy-mm-dd HH24:MI:SS');

Flashback complete.

SQL> alter database open resetlogs;

Database altered.

其实正常表空间删除后，flashback database正常情况下不行，必须要利用日志来恢复表空间。

如果有问题欢迎大家补充指正。