第一步：确认数据库运行在归档模式。
检查：

SQL> archive log list;Database log mode           No Archive ModeAutomatic archival           DisabledArchive destination           USE_DB_RECOVERY_FILE_DESTOldest online log sequence     4Current log sequence           5

当前运行在非归档模式.

关闭数据库，运行在mount模式

SQL> shutdown immediate;SQL> startup mount;

启用归档模式

SQL> alter database archivelog;

将配置写入spfile

SQL> alter system set log_archive_start=true scope=spfile;

重启数据库 运行在open模式

SQL> shutdown immediate;SQL> startup;

重新检查：已经运行在归档模式。

SQL> archive log list;Database log mode           Archive ModeAutomatic archival           EnabledArchive destination           USE_DB_RECOVERY_FILE_DESTOldest online log sequence     4Next log sequence to archive   5Current log sequence           5

第二步：备份数据库

运行rman：

[gateman@~]$ rman target /

将下面语句copy入终端运行：写成脚本都得，注意红色path的写权限

run{allocate channel d1 type disk;backup as compressed backupset incremental level = 0format '/home/gateman/Public/db_bak/db_%d_%s_%p_%t_%T' database;sql 'alter system archive log current';release channel d1;}

如果无error的话， 去该path睇下有无备份出来的备份文件。 备份时我部机卡到阿妈都唔认得

[gateman@Public]$ cd db_bak/[gateman@db_bak]$ ls -ltotal 173820-rw-r----- 1 oracle dba 176889856 Jul 22 23:07 db_XE_3_1_789346754_20120722-rw-r----- 1 oracle dba   1097728 Jul 22 23:07 db_XE_4_1_789347261_20120722


第三步：一些检验（非必要）

查看当前的数据文件：

RMAN> report schema;

using target database control file instead of recovery catalogReport of database schema for database with db_unique_name XE

List of Permanent Datafiles===========================File Size(MB) Tablespace           RB segs Datafile Name---- -------- -------------------- ------- ------------------------1    360      SYSTEM               ***     /u01/app/oracle/oradata/XE/system.dbf2    640      SYSAUX               ***     /u01/app/oracle/oradata/XE/sysaux.dbf3    25       UNDOTBS1             ***     /u01/app/oracle/oradata/XE/undotbs1.dbf4    100      USERS                ***     /u01/app/oracle/oradata/XE/users.dbf

List of Temporary Files=======================File Size(MB) Tablespace           Maxsize(MB) Tempfile Name---- -------- -------------------- ----------- --------------------1    20       TEMP                 32767       /u01/app/oracle/oradata/XE/temp.dbf

查看归档日志：

RMAN> list copy of archivelog all;

List of Archived Log Copies for database with db_unique_name XE=====================================================================

Key     Thrd Seq     S Low Time ------- ---- ------- - ---------1       1    5       A 17-JUL-12        Name: /u01/app/oracle/fast_recovery_area/XE/archivelog/2012_07_22/o1_mf_1_5_80r5tngg_.arc

2       1    6       A 22-JUL-12        Name: /u01/app/oracle/fast_recovery_area/XE/archivelog/2012_07_22/o1_mf_1_6_80r7q4y8_.arc

查看还原预览： 可以见到关键信息

RMAN> restore database preview;

Starting restore at 22-JUL-12allocated channel: ORA_DISK_1channel ORA_DISK_1: SID=51 device type=DISK

List of Backup Sets===================

BS Key  Type LV Size       Device Type Elapsed Time Completion Time------- ---- -- ---------- ----------- ------------ ---------------1       Incr 0  168.69M    DISK        00:08:23     22-JUL-12              BP Key: 1   Status: AVAILABLE  Compressed: YES  Tag: TAG20120722T225914        Piece Name: /home/gateman/Public/db_bak/db_XE_3_1_789346754_20120722  List of Datafiles in backup set 1  File LV Type Ckp SCN    Ckp Time  Name  ---- -- ---- ---------- --------- ----  1    0  Incr 422228     22-JUL-12 /u01/app/oracle/oradata/XE/system.dbf  2    0  Incr 422228     22-JUL-12 /u01/app/oracle/oradata/XE/sysaux.dbf  3    0  Incr 422228     22-JUL-12 /u01/app/oracle/oradata/XE/undotbs1.dbf  4    0  Incr 422228     22-JUL-12 /u01/app/oracle/oradata/XE/users.dbfusing channel ORA_DISK_1

List of Archived Log Copies for database with db_unique_name XE=====================================================================

Key     Thrd Seq     S Low Time ------- ---- ------- - ---------1       1    5       A 17-JUL-12        Name: /u01/app/oracle/fast_recovery_area/XE/archivelog/2012_07_22/o1_mf_1_5_80r5tngg_.arc

2       1    6       A 22-JUL-12        Name: /u01/app/oracle/fast_recovery_area/XE/archivelog/2012_07_22/o1_mf_1_6_80r7q4y8_.arc

Media recovery start SCN is 422228Recovery must be done beyond SCN 422228 to clear datafile fuzzinessFinished restore at 22-JUL-12

查看控制文件备份， 可以看到存在于刚才备份出来的文件中

RMAN> list backup of controlfile;

List of Backup Sets===================

BS Key  Type LV Size       Device Type Elapsed Time Completion Time------- ---- -- ---------- ----------- ------------ ---------------2       Incr 0  1.03M      DISK        00:00:05     22-JUL-12              BP Key: 2   Status: AVAILABLE  Compressed: YES  Tag: TAG20120722T225914        Piece Name: /home/gateman/Public/db_bak/db_XE_4_1_789347261_20120722  Control File Included: Ckp SCN: 422479       Ckp time: 22-JUL-12

RMAN>

查看spfile备份

RMAN> list backup of spfile;

List of Backup Sets===================

BS Key  Type LV Size       Device Type Elapsed Time Completion Time------- ---- -- ---------- ----------- ------------ ---------------2       Incr 0  1.03M      DISK        00:00:05     22-JUL-12              BP Key: 2   Status: AVAILABLE  Compressed: YES  Tag: TAG20120722T225914        Piece Name: /home/gateman/Public/db_bak/db_XE_4_1_789347261_20120722  SPFILE Included: Modification time: 22-JUL-12  SPFILE db_unique_name: XE

第四步：删除数据库

你们懂的

RMAN> shutdown immediate;RMAN> startup mount;

开启受限模式， 禁止闲杂人等连接。

RMAN> sql 'alter system enable restricted session';

sql statement: alter system enable restricted session

drop 掉数据库..  spfile control file 数据文件都无晒噶啦。

spfile目录：pwd

RMAN> drop database;

退出下先

RMAN> exit


第五步：还原数据库

连接rman

[gateman@~]$ rman target /

nomount模式

RMAN> startup nomount;

startup failed: ORA-01078: failure in processing system parametersLRM-00109: could not open parameter file '/u01/app/oracle/product/11.2.0/xe/dbs/initXE.ora'

starting Oracle instance without parameter file for retrieval of spfileOracle instance started

Total System Global Area     158662656 bytes

Fixed Size                     2224592 bytesVariable Size                 96472624 bytesDatabase Buffers              54525952 bytesRedo Buffers

还原spfile

RMAN> restore spfile from '/home/gateman/Public/db_bak/db_XE_4_1_789347261_20120722'2> ;

Starting restore at 23-JUL-12using target database control file instead of recovery catalogallocated channel: ORA_DISK_1channel ORA_DISK_1: SID=135 device type=DISK

channel ORA_DISK_1: restoring spfile from AUTOBACKUP /home/gateman/Public/db_bak/db_XE_4_1_789347261_20120722channel ORA_DISK_1: SPFILE restore from AUTOBACKUP completeFinished restore at 23-JUL-12

还原controlfile 控制文件

RMAN> restore controlfile from '/home/gateman/Public/db_bak/db_XE_4_1_789347261_20120722';

Starting restore at 23-JUL-12using channel ORA_DISK_1

channel ORA_DISK_1: restoring control filechannel ORA_DISK_1: restore complete, elapsed time: 00:00:03output file name=/u01/app/oracle/product/11.2.0/xe/dbs/cntrlXE.dbfFinished restore at 23-JUL-12

注意上面呢个 还原出bug了 叼

下面呢个先系正常的 不然改不了mount模式：话controlfile有问题，  所以path唔正常的命令执行多一次， controlfile 的path有记录在spfile中，对比下一唔一致。

RMAN> restore controlfile from '/home/gateman/Public/db_bak/db_XE_4_1_789347261_20120722';

Starting restore at 23-JUL-12using channel ORA_DISK_1

channel ORA_DISK_1: restoring control filechannel ORA_DISK_1: restore complete, elapsed time: 00:00:03output file name=/u01/app/oracle/oradata/XE/control.dbfFinished restore at 23-JUL-12

改成mount 模式

RMAN> alter database mount;

database mountedreleased channel: ORA_DISK_1

check下backup文件

RMAN> crosscheck backup;

Starting implicit crosscheck backup at 23-JUL-12allocated channel: ORA_DISK_1channel ORA_DISK_1: SID=5 device type=DISKCrosschecked 1 objectsFinished implicit crosscheck backup at 23-JUL-12

Starting implicit crosscheck copy at 23-JUL-12using channel ORA_DISK_1Finished implicit crosscheck copy at 23-JUL-12

searching for all files in the recovery areacataloging files...cataloging done

List of Cataloged Files=======================File Name: /u01/app/oracle/fast_recovery_area/XE/archivelog/2012_07_22/o1_mf_1_6_80r7q4y8_.arcFile Name: /u01/app/oracle/fast_recovery_area/XE/archivelog/2012_07_22/o1_mf_1_5_80r5tngg_.arc

using channel ORA_DISK_1crosschecked backup piece: found to be 'AVAILABLE'backup piece handle=/home/gateman/Public/db_bak/db_XE_3_1_789346754_20120722 RECID=1 STAMP=789346754Crosschecked 1 objects

再check下预览 因为恢复了controlfile 预览应该会正常。

RMAN> restore database preview;

开始真正还原数据文件

RMAN> restore database;

Starting restore at 23-JUL-12using channel ORA_DISK_1

channel ORA_DISK_1: starting datafile backup set restorechannel ORA_DISK_1: specifying datafile(s) to restore from backup setchannel ORA_DISK_1: restoring datafile 00001 to /u01/app/oracle/oradata/XE/system.dbfchannel ORA_DISK_1: restoring datafile 00002 to /u01/app/oracle/oradata/XE/sysaux.dbfchannel ORA_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/XE/undotbs1.dbfchannel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/XE/users.dbfchannel ORA_DISK_1: reading from backup piece /home/gateman/Public/db_bak/db_XE_3_1_789346754_20120722channel ORA_DISK_1: piece handle=/home/gateman/Public/db_bak/db_XE_3_1_789346754_20120722 tag=TAG20120722T225914channel ORA_DISK_1: restored backup piece 1channel ORA_DISK_1: restore complete, elapsed time: 00:01:45Finished restore at 23-JUL-12

貌似成功了

第六步：检验完整性

有问题

RMAN> alter database open resetlogs;

RMAN-00571: ===========================================================RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============RMAN-00571: ===========================================================RMAN-03002: failure of alter db command at 07/23/2012 00:57:12ORA-01152: file 1 was not restored from a sufficiently old backup ORA-01110: data file 1: '/u01/app/oracle/oradata/XE/system.dbf'
recover 虽然报错话找不到归档日志， 因为drop database 时被删除了。 但是 执行这个命令后就可以open

RMAN> recover database;

Starting recover at 23-JUL-12using channel ORA_DISK_1

starting media recovery

archived log for thread 1 with sequence 5 is already on disk as file /u01/app/oracle/fast_recovery_area/XE/archivelog/2012_07_22/o1_mf_1_5_80r5tngg_.arcarchived log for thread 1 with sequence 6 is already on disk as file /u01/app/oracle/fast_recovery_area/XE/archivelog/2012_07_22/o1_mf_1_6_80r7q4y8_.arcarchived log file name=/u01/app/oracle/fast_recovery_area/XE/archivelog/2012_07_22/o1_mf_1_5_80r5tngg_.arc thread=1 sequence=5archived log file name=/u01/app/oracle/fast_recovery_area/XE/archivelog/2012_07_22/o1_mf_1_6_80r7q4y8_.arc thread=1 sequence=6unable to find archived logarchived log thread=1 sequence=7RMAN-00571: ===========================================================RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============RMAN-00571: ===========================================================RMAN-03002: failure of recover command at 07/23/2012 00:57:50RMAN-06054: media recovery requesting unknown archived log for thread 1 with sequence 7 and starting SCN of 442570

呢次终于可以open了

RMAN> alter database open resetlogs;

database opened

最后， 禁止返受限模式，其他人又可以连接了

RMAN> sql 'alter system disable restricted session'; 

 sql statement: alter system disable restricted session

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