flashback database 恢复删除的表空间
当误删除表空间，且没有备份，开启归档和闪回，可以使用flashback database恢复表空间
1.数据库版本
sys@TEST> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
2.要恢复的数据
sys@TEST> select count(*) from test.a;
COUNT(*)
13238
3.当前的scn
sys@TEST> select current_scn,to_char(sysdate,’yyyy-mm-dd hh24:mi:ss’) from v$database;
CURRENT_SCN TO_CHAR(SYSDATE,’YY
543532 2015-03-05 16:17:32
4.模拟误删除表空间
sys@TEST> drop tablespace test including contents and datafiles;
Tablespace dropped.
sys@TEST> select count(*) from test.a; –已经查找不到表了
select count(*) from test.a
*
ERROR at line 1:
ORA-00942: table or view does not exist
5.关闭数据库并启动到mount;
sys@TEST> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
sys@TEST> startup mount;
ORACLE instance started.
Total System Global Area 1068937216 bytes
Fixed Size 2235208 bytes
Variable Size 645924024 bytes
Database Buffers 415236096 bytes
Redo Buffers 5541888 bytes
Database mounted.
6.闪回数据库
sys@TEST> flashback database to scn ‘543532’;
Flashback complete.
sys@TEST> select file#,name,status from v$datafile;
FILE# NAME STATUS
1 /home/u01/app/oracle/oradata/test/system01.dbf SYSTEM
2 /home/u01/app/oracle/oradata/test/sysaux01.dbf RECOVER
3 /home/u01/app/oracle/oradata/test/undotbs01.dbf RECOVER
4 /home/u01/app/oracle/oradata/test/users01.dbf RECOVER
5 /home/u01/app/oracle/product/11.2.0/db_1/dbs/UNNAMED00005 RECOVER
6 /home/u01/app/oracle/oradata/test/example.dbf RECOVER
7 /home/u01/app/oracle/oradata/test/indx.dbf RECOVER
8 /home/u01/app/oracle/oradata/test/tool.dbf RECOVER
9 /home/u01/app/oracle/oradata/test/oltp.dbf RECOVER
flashback database 会恢复删除的表空间，但是数据文件需要自己指定
7.创建数据文件
sys@TEST> alter database create datafile 5 as ‘/home/u01/app/oracle/oradata/test/test.dbf’;
Database altered.
sys@TEST> select file#,name,status from v$datafile;
FILE# NAME STATUS
1 /home/u01/app/oracle/oradata/test/system01.dbf SYSTEM
2 /home/u01/app/oracle/oradata/test/sysaux01.dbf RECOVER
3 /home/u01/app/oracle/oradata/test/undotbs01.dbf RECOVER
4 /home/u01/app/oracle/oradata/test/users01.dbf RECOVER
5 /home/u01/app/oracle/oradata/test/test.dbf RECOVER
6 /home/u01/app/oracle/oradata/test/example.dbf RECOVER
7 /home/u01/app/oracle/oradata/test/indx.dbf RECOVER
8 /home/u01/app/oracle/oradata/test/tool.dbf RECOVER
9 /home/u01/app/oracle/oradata/test/oltp.dbf RECOVER
9 rows selected.
8.数据文件处于offline状态，修改为online；
sys@TEST> select * from v$recover_file;
FILE# ONLINE ONLINE_ ERROR CHANGE# TIME
1 ONLINE ONLINE 543533 05-MAR-15
2 ONLINE ONLINE 543533 05-MAR-15
3 ONLINE ONLINE 543533 05-MAR-15
4 ONLINE ONLINE 543533 05-MAR-15
5 OFFLINE OFFLINE UNKNOWN ERROR 540888 05-MAR-15
6 ONLINE ONLINE 543533 05-MAR-15
7 ONLINE ONLINE 543533 05-MAR-15
8 ONLINE ONLINE 543533 05-MAR-15
9 ONLINE ONLINE
sys@TEST> alter database datafile 5 online;
Database altered.
9.恢复数据库，使用rman until scn
RMAN> recover database until scn 543532;
Starting recover at 05-MAR-15
using channel ORA_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 03/05/2015 16:49:01
RMAN-06556: datafile 1 must be restored from backup older than SCN 543532
–datafile 1 当前的scn是543533晚于543532，until scn 改为543533
sys@TEST> select file#,name,status,checkpoint_change# from v$datafile;
FILE# NAME STATUS CHECKPOINT_CHANGE#
1 /home/u01/app/oracle/oradata/test/system01.dbf SYSTEM 543533
2 /home/u01/app/oracle/oradata/test/sysaux01.dbf RECOVER 543533
3 /home/u01/app/oracle/oradata/test/undotbs01.dbf RECOVER 543533
4 /home/u01/app/oracle/oradata/test/users01.dbf RECOVER 543533
5 /home/u01/app/oracle/oradata/test/test.dbf RECOVER 542863
6 /home/u01/app/oracle/oradata/test/example.dbf RECOVER 543533
7 /home/u01/app/oracle/oradata/test/indx.dbf RECOVER 543533
8 /home/u01/app/oracle/oradata/test/tool.dbf RECOVER 543533
9 /home/u01/app/oracle/oradata/test/oltp.dbf RECOVER 543533
RMAN> recover database until scn 543533;
Starting recover at 05-MAR-15
using channel ORA_DISK_1
starting media recovery
archived log for thread 1 with sequence 3 is already on disk as file /home/u01/app/oracle/archivelog/1_3_873486141.dbf
archived log for thread 1 with sequence 4 is already on disk as file /home/u01/app/oracle/archivelog/1_4_873486141.dbf
archived log for thread 1 with sequence 5 is already on disk as file /home/u01/app/oracle/archivelog/1_5_873486141.dbf
archived log for thread 1 with sequence 1 is already on disk as file /home/u01/app/oracle/oradata/test/redo01.log
archived log file name=/home/u01/app/oracle/archivelog/1_3_873486141.dbf thread=1 sequence=3
archived log file name=/home/u01/app/oracle/archivelog/1_4_873486141.dbf thread=1 sequence=4
archived log file name=/home/u01/app/oracle/archivelog/1_5_873486141.dbf thread=1 sequence=5
media recovery complete, elapsed time: 00:00:01
Finished recover at 05-MAR-15
10.打开数据库，并验证
sys@TEST> alter database open resetlogs;
Database altered.
sys@TEST> select count(*) from test.a;
COUNT(*)
13238
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