rman恢复－不完全恢复

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rman不完全恢复
只适用于archivelog模式，只能在mount状态下完成。
基于时间恢复
基于时间恢复是指当出现用户错误（例如误删除表、误截断表）时，恢复到指定时间点的恢复。
示例：
模拟误截断表t_user。
在终端设置环境变量nls_date_format指定日期时间格式。
执行rman,启动数据库到mount状态。
使用set until time命令指定要恢复到的时间点。

转储、恢复数据库，并使用resetlogs选项打开数据库。

在实际环境下，应该使用LogMiner确定误操作时间点。
在执行了不完全恢复之后，推荐删除早期所有备份，重新备份数据库。如：
run {
delete noprompt backup;
delete noprompt copy;
backup database format='/oracle/10g/oracle/rman/%d_%s.dbf';
sql 'alter system archive log current';
}

基于SCN恢复
基于SCN恢复是指当出现用户错误（例如误删除表、误截断表）时，恢复到指定SCN点的恢复。
模拟误删除表t_user。
执行rman,启动数据库到mount状态。
使用set until scn命令指定要恢复到的scn点。
转储、恢复数据库，并使用resetlogs选项打开数据库。

在实际环境下，应该使用LogMiner确定误操作SCN点。
在执行了不完全恢复之后，推荐删除早期所有备份，重新备份数据库。

基于日志序列号恢复
基于日志序列号恢复是指恢复数据库到指定日志序列号的状态。

--查看归档日志信息
SQL> select * from t_user;

TEXT
--------------------
java_
spring_
spring mvc_

SQL> insert into t_user select 'oracle_' from dual;

1 row created.

SQL> commit;

Commit complete.

SQL> alter system switch logfile;

System altered.

SQL> alter system checkpoint;

System altered.

SQL> select sequence#,name,first_change# from v$archived_log where status='A' order by sequence#;

SEQUENCE# NAME                                                                                                 FIRST_CHANGE#
---------- ---------------------------------------------------------------------------------------------------- -------------
         1 /oracle/10g/oracle/log/archive_log/archive_1_1_760487088.arclog                                            1214497
         1 /oracle/10g/oracle/log/archive_log2/archive_1_1_760487088.arclog                                           1214497
         1 /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/archivelog/2011_08_29/o1_mf_1_1_7       1214498
           5q9bh9d_.arc

1 /oracle/10g/oracle/log/archive_log/archive_1_1_760487985.arclog                                            1214498
         1 /oracle/10g/oracle/log/archive_log2/archive_1_1_760487985.arclog                                           1214498
         1 /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/archivelog/2011_08_29/o1_mf_1_1_7       1214497
           5q95ksf_.arc

6 rows selected.

SQL> insert into t_user select 'oracle_seq3' from dual;

1 row created.

SQL> commit;

Commit complete.

SQL> alter system switch logfile; --生成日志序列号为2的归档日志

System altered.

SQL> alter system checkpoint;

System altered.

SQL> select sequence#,name,first_change# from v$archived_log where status='A' order by sequence#;

2 /oracle/10g/oracle/log/archive_log/archive_1_2_760487985.arclog                                            1216167

SEQUENCE# NAME                                                                                                 FIRST_CHANGE#
---------- ---------------------------------------------------------------------------------------------------- -------------
         2 /oracle/10g/oracle/log/archive_log2/archive_1_2_760487985.arclog                                           1216167
         2 /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/archivelog/2011_08_29/o1_mf_1_2_7       1216167
           5q9cvt1_.arc

9 rows selected.

SQL> insert into t_user select 'oracle_seq3_act' from dual;

1 row created.

SQL> commit;

Commit complete.

SQL> alter system switch logfile; --生成日志序列号为3的归档日志

System altered.

SQL> alter system checkpoint;

System altered.

SQL> select sequence#,name,first_change# from v$archived_log where status='A' order by sequence#;

2 /oracle/10g/oracle/log/archive_log/archive_1_2_760487985.arclog                                            1216167

3 /oracle/10g/oracle/log/archive_log/archive_1_3_760487985.arclog                                            1216186
         3 /oracle/10g/oracle/log/archive_log2/archive_1_3_760487985.arclog                                           1216186
         3 /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/archivelog/2011_08_29/o1_mf_1_3_7       1216186
           5q9f4d6_.arc

12 rows selected.

--恢复到日志序列号为3时的状态
[oracle@localhost ~]$ rman target sys/oracle@oralife nocatalog
RMAN> run {
 startup force mount;
 set until sequence=3;
 restore database;
 recover database;
 sql 'alter database open resetlogs';
}

--查看，可见不包括日志序列号为3的归档日志信息（oracle_seq3_act)，即恢复到日志序列号为2的归档日志
SQL> conn sys/oracle@oralife as sysdba
Connected.
SQL> select * from t_user;

TEXT
--------------------
java_
spring_
oracle_
oracle_seq3
spring mvc_

可见不包括日志序列号为3的归档日志信息（oracle_seq3_act)，即恢复到日志序列号为2的归档日志。

在执行了不完全恢复之后，推荐删除早期所有备份，重新备份数据库。

基于备份控制文件恢复
基于备份控制文件恢复是指使用备份控制文件恢复数据库的过程。当误删除了表空间或数据库所有控制文件全部损坏时，可以使用这种恢复方法。
模拟误删除了test表空间，因为当前控制文件没有包含该表空间的信息，所以必须使用备份控制文件恢复被误删除的表空间。如果没有使用恢复目录，必须激活控制文件自动备份，否则将不转储控制文件备份。
模拟误删除test表空间。
查看alert日志文件，确定操作时间。
使用rman启动数据库到mount状态。
设置数据库id。
转储控制文件，恢复数据库。

--模拟误删除test表空间。
SQL> create tablespace rtest DATAFILE '/oracle/10g/oracle/product/10.2.0/oradata/oralife/rtest.dbf' size 10M;

Tablespace created.

SQL> create table r_test (text varchar(20)) tablespace rtest;

Table created.

SQL> insert into r_test select '00001' from dual;

1 row created.

SQL> commit;

Commit complete.

SQL> alter system switch logfile;

System altered.

SQL> alter system checkpoint;

System altered.

SQL> insert into r_test select '00002' from dual;

1 row created.

SQL> commit;

Commit complete.

SQL> alter system switch logfile;

System altered.

SQL> alter system checkpoint;

System altered.

SQL> select count(*) from r_test;

COUNT(*)
----------
         2

SQL> drop tablespace rtest including contents;

Tablespace dropped.

SQL> select dbid from v$database;

DBID
----------
3898974595

SQL> select count(*) from r_test;
select count(*) from r_test
                     *
ERROR at line 1:
ORA-00942: table or view does not exist

SQL> host tail -n 15 /oracle/10g/oracle/product/10.2.0/db_1/admin/oralife/bdump/alert_oralife.log
  Current log# 4 seq# 7 mem# 0: /oracle/10g/oracle/product/10.2.0/oradata/oralife/redo04.log
  Current log# 4 seq# 7 mem# 1: /oracle/10g/oracle/product/10.2.0/oradata/oralife/redo04_add.log
Tue Aug 30 22:17:30 2011
drop tablespace rtest including contents
Tue Aug 30 22:17:30 2011
Starting control autobackup
Tue Aug 30 22:17:31 2011
Errors in file /oracle/10g/oracle/product/10.2.0/db_1/admin/oralife/udump/oralife_ora_4751.trc:
Tue Aug 30 22:17:31 2011
Errors in file /oracle/10g/oracle/product/10.2.0/db_1/admin/oralife/udump/oralife_ora_4751.trc:
Tue Aug 30 22:17:31 2011
Errors in file /oracle/10g/oracle/product/10.2.0/db_1/admin/oralife/udump/oralife_ora_4751.trc:
Control autobackup written to DISK device
        handle '/oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/autobackup/2011_08_30/o1_mf_s_760573050_75sw7twr_.bkp'
Completed: drop tablespace rtest including contents

--恢复
[oracle@localhost ~]$ export NLS_DATE_FORMAT='YYYY-MM-DD HH24:MI:SS'  
[oracle@localhost ~]$ rman target sys/oracle@oralife nocatalog
RMAN> startup force nomount;
RMAN> set dbid=3898974595;
RMAN> restore controlfile from autobackup;
RMAN> alter database mount;
RMAN> run {
 set until time='2011-08-30 22:17:30';
 restore database;
 recover database;
 sql 'alter database open resetlogs';
}

--查看
SQL> quit
[oracle@localhost ~]$ sqlplus sys/oracle@oralife as sysdba
SQL> select count(*) from r_test;
select count(*) from r_test
                     *
ERROR at line 1:
ORA-00376: file 6 cannot be read at this time
ORA-01111: name for data file 6 is unknown - rename to correct file
ORA-01110: data file 6:
'/oracle/10g/oracle/product/10.2.0/db_1/dbs/MISSING00006'

SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------------
/oracle/10g/oracle/product/10.2.0/oradata/oralife/system01.dbf
/oracle/10g/oracle/product/10.2.0/oradatabak/undotbs01.dbf
/oracle/10g/oracle/product/10.2.0/oradatabak/sysaux01.dbf
/oracle/10g/oracle/product/10.2.0/oradata/oralife/user01.dbf
/oracle/10g/oracle/product/10.2.0/oradata/oralife/example01.dbf
/oracle/10g/oracle/product/10.2.0/db_1/dbs/MISSING00006

6 rows selected.

恢复失败，失败原因:restore controlfile from autobackup;用于转储自动备份的最新的控制文件，即删除表空间rtest之后自动备份的控制文件。

解决办法：使用restore controlfile from autobackup until time "to_date('2011-08-31 21:26:16','yyyy-mm-dd hh24:mi:ss')"; 查看alert日志文件确定删除表空间rtest之前自动备份控制文件时间，也就是删除表空间rtest之前的时间点。

SQL> create tablespace rtest DATAFILE '/oracle/10g/oracle/product/10.2.0/oradata/oralife/rtest.dbf' size 10M; Tablespace created. SQL> create table r_test (text varchar(20)) tablespace rtest; Table created. SQL> insert into r_test select '00001' from dual; 1 row created. SQL> commit; Commit complete. SQL> alter system switch logfile; System altered. SQL> alter system checkpoint; System altered. --删除早期所有备份，重新备份数据库 RMAN> run { delete noprompt backup; delete noprompt copy; backup database format='/oracle/10g/oracle/rman/%d_%s.dbf'; sql 'alter system archive log current'; } --删除表空间与对应的数据文件 SQL> insert into r_test select '00002' from dual; 1 row created. SQL> commit; Commit complete. SQL> alter system switch logfile; System altered. SQL> alter system checkpoint; System altered. SQL> select count(*) from r_test; COUNT(*) ---------- 2 SQL> drop tablespace rtest including contents and datafiles; Tablespace dropped. SQL> select dbid from v$database; DBID ---------- 3898974595 SQL> select count(*) from r_test; select count(*) from r_test * ERROR at line 1: ORA-00942: table or view does not exist --查看alert日志，以确定操作时间，Wed Aug 31 21:26:17 2011 SQL> host tail -n 20 /oracle/10g/oracle/product/10.2.0/db_1/admin/oralife/bdump/alert_oralife.log Current log# 4 seq# 4 mem# 0: /oracle/10g/oracle/product/10.2.0/oradata/oralife/redo04.log Current log# 4 seq# 4 mem# 1: /oracle/10g/oracle/product/10.2.0/oradata/oralife/redo04_add.log Wed Aug 31 21:25:26 2011 Thread 1 advanced to log sequence 5 Current log# 2 seq# 5 mem# 0: /oracle/10g/oracle/product/10.2.0/oradata/oralife/redo02.log Current log# 2 seq# 5 mem# 1: /oracle/10g/oracle/product/10.2.0/oradata/oralife/redo02_add.log Wed Aug 31 21:26:17 2011 drop tablespace rtest including contents and datafiles Wed Aug 31 21:26:18 2011 Deleted file /oracle/10g/oracle/product/10.2.0/oradata/oralife/rtest.dbf Starting control autobackup Wed Aug 31 21:26:18 2011 Errors in file /oracle/10g/oracle/product/10.2.0/db_1/admin/oralife/udump/oralife_ora_3646.trc: Wed Aug 31 21:26:18 2011 Errors in file /oracle/10g/oracle/product/10.2.0/db_1/admin/oralife/udump/oralife_ora_3646.trc: Wed Aug 31 21:26:18 2011 Errors in file /oracle/10g/oracle/product/10.2.0/db_1/admin/oralife/udump/oralife_ora_3646.trc: Control autobackup written to DISK device handle '/oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/autobackup/2011_08_31/o1_mf_s_760656378_75wfmtcm_.bkp' Completed: drop tablespace rtest including contents and datafiles --恢复控制文件 [oracle@localhost ~]$ export NLS_DATE_FORMAT='YYYY-MM-DD HH24:MI:SS' [oracle@localhost ~]$ rman target sys/oracle@oralife nocatalog RMAN> startup force nomount; RMAN> set dbid=3898974595; --与下面set until time（即删除表空间rtest的操作时间)相比少了1秒，以转储正确的控制文件， --如果这里设置的时间与alert日志中删除表空间的操作时间相同，会转储最新的控制文件（没有包含表空间rtest信息)导致恢复失败。 RMAN> restore controlfile from autobackup until time "to_date('2011-08-31 21:26:16','yyyy-mm-dd hh24:mi:ss')"; Starting restore at 2011-08-31 21:35:29 using channel ORA_DISK_1 recovery area destination: /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area database name (or database unique name) used for search: ORALIFE channel ORA_DISK_1: autobackup found in the recovery area channel ORA_DISK_1: autobackup found: /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/autobackup/2011_08_31/o1_mf_s_760656297_75wfk9gc_.bkp channel ORA_DISK_1: control file restore from autobackup complete output filename=/oracle/10g/oracle/product/10.2.0/oradata/oralife/control01.ctl output filename=/oracle/10g/oracle/product/10.2.0/oradata/oralife/control02.ctl output filename=/oracle/10g/oracle/product/10.2.0/oradata/oralife/control03.ctl Finished restore at 2011-08-31 21:35:33 RMAN> alter database mount; RMAN> run { set until time='2011-08-31 21:26:17'; restore database; recover database; sql 'alter database open resetlogs'; 6> } executing command: SET until clause Starting restore at 2011-08-31 21:36:43 Starting implicit crosscheck backup at 2011-08-31 21:36:43 allocated channel: ORA_DISK_1 channel ORA_DISK_1: sid=156 devtype=DISK Crosschecked 1 objects Finished implicit crosscheck backup at 2011-08-31 21:36:44 Starting implicit crosscheck copy at 2011-08-31 21:36:44 using channel ORA_DISK_1 Finished implicit crosscheck copy at 2011-08-31 21:36:44 searching for all files in the recovery area cataloging files... cataloging done List of Cataloged Files ======================= File Name: /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/archivelog/2011_08_31/o1_mf_1_4_75wfl6w2_.arc File Name: /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/archivelog/2011_08_31/o1_mf_1_3_75wfkc9w_.arc File Name: /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/autobackup/2011_08_31/o1_mf_s_760656297_75wfk9gc_.bkp File Name: /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/autobackup/2011_08_31/o1_mf_s_760656378_75wfmtcm_.bkp using channel ORA_DISK_1 channel ORA_DISK_1: starting datafile backupset restore channel ORA_DISK_1: specifying datafile(s) to restore from backup set restoring datafile 00001 to /oracle/10g/oracle/product/10.2.0/oradata/oralife/system01.dbf restoring datafile 00002 to /oracle/10g/oracle/product/10.2.0/oradatabak/undotbs01.dbf restoring datafile 00003 to /oracle/10g/oracle/product/10.2.0/oradatabak/sysaux01.dbf restoring datafile 00004 to /oracle/10g/oracle/product/10.2.0/oradata/oralife/user01.dbf restoring datafile 00005 to /oracle/10g/oracle/product/10.2.0/oradata/oralife/example01.dbf restoring datafile 00006 to /oracle/10g/oracle/product/10.2.0/oradata/oralife/rtest.dbf --转储了表空间rtest对应的数据文件 channel ORA_DISK_1: reading from backup piece /oracle/10g/oracle/rman/ORALIFE_98.dbf channel ORA_DISK_1: restored backup piece 1 piece handle=/oracle/10g/oracle/rman/ORALIFE_98.dbf tag=TAG20110831T212421 channel ORA_DISK_1: restore complete, elapsed time: 00:00:35 Finished restore at 2011-08-31 21:37:20 Starting recover at 2011-08-31 21:37:20 using channel ORA_DISK_1 starting media recovery archive log thread 1 sequence 3 is already on disk as file /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/archivelog/2011_08_31/o1_mf_1_3_75wfkc9w_.arc archive log thread 1 sequence 4 is already on disk as file /oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/archivelog/2011_08_31/o1_mf_1_4_75wfl6w2_.arc archive log thread 1 sequence 5 is already on disk as file /oracle/10g/oracle/product/10.2.0/oradata/oralife/redo02.log archive log filename=/oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/archivelog/2011_08_31/o1_mf_1_3_75wfkc9w_.arc thread=1 sequence=3 archive log filename=/oracle/10g/oracle/product/10.2.0/db_1/flash_recovery_area/ORALIFE/archivelog/2011_08_31/o1_mf_1_4_75wfl6w2_.arc thread=1 sequence=4 archive log filename=/oracle/10g/oracle/product/10.2.0/oradata/oralife/redo02.log thread=1 sequence=5 media recovery complete, elapsed time: 00:00:03 Finished recover at 2011-08-31 21:37:25 sql statement: alter database open resetlogs --查看，已恢复 [oracle@localhost ~]$ sqlplus sys/oracle@oralife as sysdba SQL> select count(*) from r_test; COUNT(*) ---------- 2

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