Oracle RMAN 备份及不完全恢复(删除archievelog)

Posted 2020-07-26 ericnie的技术博客

RMAN备份命令

 

backup Database format=‘/home/oracle/backup/bak_full_%U_%T‘ tag=‘bak_full‘;  sql ‘alter system archive log current‘;  backup archivelog all tag=‘arc_bak‘ format=‘/home/oracle/backup/arch_%U_%T‘ delete input;  backup current controlfile tag=‘bak_ctlfile‘ format=‘/home/oracle/backup/bak_ctl_%U_%T‘;  backup spfile tag=‘spfile‘ format=‘/home/oracle/backup/bak_spfile_%U_%T‘;

 

 

备份完后插入测试数据

insert into zz values(2); commit;

insert into qq values(2); commit;

然后通过alter system switch logfile多切几次归档,切出多个归档文件

o1_mf_1_12_cpb2xhg8_.arc o1_mf_1_14_cpb36dbo_.arc
o1_mf_1_13_cpb35zgs_.arc o1_mf_1_15_cpb37ff2_.arc

删除12和14文件

[[email protected] 2016_06_18]$ rm o1_mf_1_12_cpb2xhg8_.arc
[[email protected] 2016_06_18]$ rm o1_mf_1_14_cpb36dbo_.arc

 

通过在RMAN中运行处理使得报错

run {

sql‘alter database datafile 6 offline‘;

restore datafile 6;

recover datafile 6;

sql‘alter database datafile 6 online‘;

}

错误为

RMAN> recover datafile 6; Starting recover at 18-JUN-16 using channel ORA_DISK_1 starting media recovery archived log for thread 1 with sequence 13 is already on disk as file /u01/app/oracle/flash_recovery_area/ORCL/archivelog/2016_06_18/o1_mf_1_13_cpb35zgs_.arc archived log for thread 1 with sequence 15 is already on disk as file /u01/app/oracle/flash_recovery_area/ORCL/archivelog/2016_06_18/o1_mf_1_15_cpb37ff2_.arc RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03002: failure of recover command at 06/18/2016 16:59:59 RMAN-06053: unable to perform media recovery because of missing log RMAN-06025: no backup of archived log for thread 1 with sequence 14 and starting SCN of 1105737 found to restore RMAN-06025: no backup of archived log for thread 1 with sequence 12 and starting SCN of 1080714 found to restore

 

查看archieve目录,发现确实只有

o1_mf_1_13_cpb35zgs_.arc  o1_mf_1_15_cpb37ff2_.arc

 

查看v$log,得到最后需要应用的日志文件应该是16

SQL> select group#,sequence#,status from v$log;

GROUP# SEQUENCE# STATUS
---------- ---------- ----------------
1 16 CURRENT
2 14 INACTIVE
3 15 INACTIVE

 

被还原的6号文件的scn为

SQL> select file#,change# from v$recover_file;

FILE# CHANGE#
---------- ----------
6 1080514

 

查看v$log_history得知需要从10号文件开始恢复

SQL> select sequence# from v$log_history where 1080514 between first_change# and next_change#-1;

SEQUENCE#
----------
10

 

RMAN> list backup of archivelog all;

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

BS Key Size Device Type Elapsed Time Completion Time
------- ---------- ----------- ------------ ---------------
3 61.04M DISK 00:00:03 16-JUN-16
BP Key: 3 Status: AVAILABLE Compressed: NO Tag: TAG20160616T165323
Piece Name: /u01/app/oracle/flash_recovery_area/ORCL/backupset/2016_06_16/o1_mf_annnn_TAG20160616T165323_cp4t83nk_.bkp

List of Archived Logs in backup set 3
Thrd Seq Low SCN Low Time Next SCN Next Time
---- ------- ---------- --------- ---------- ---------
1 6 1022418 08-JUN-16 1033516 16-JUN-16
1 7 1033516 16-JUN-16 1047305 16-JUN-16

BS Key Size Device Type Elapsed Time Completion Time
------- ---------- ----------- ------------ ---------------
4 61.05M DISK 00:00:02 16-JUN-16
BP Key: 4 Status: AVAILABLE Compressed: NO Tag: TAG20160616T165445
Piece Name: /u01/app/oracle/flash_recovery_area/ORCL/backupset/2016_06_16/o1_mf_annnn_TAG20160616T165445_cp4tbogp_.bkp

List of Archived Logs in backup set 4
Thrd Seq Low SCN Low Time Next SCN Next Time
---- ------- ---------- --------- ---------- ---------
1 6 1022418 08-JUN-16 1033516 16-JUN-16
1 7 1033516 16-JUN-16 1047305 16-JUN-16
1 8 1047305 16-JUN-16 1047358 16-JUN-16

BS Key Size Device Type Elapsed Time Completion Time
------- ---------- ----------- ------------ ---------------
7 61.02M DISK 00:00:03 18-JUN-16
BP Key: 7 Status: AVAILABLE Compressed: NO Tag: ARC_BACK
Piece Name: /home/oracle/backup/arch_07r8fcti_1_1_20160618

List of Archived Logs in backup set 7
Thrd Seq Low SCN Low Time Next SCN Next Time
---- ------- ---------- --------- ---------- ---------
1 9 1047358 16-JUN-16 1071119 16-JUN-16
1 10 1071119 16-JUN-16 1080684 18-JUN-16
1 11 1080684 18-JUN-16 1080714 18-JUN-16

 

备份级里面有6,7,8,9,10,11,6号文件test01.dbf需要的是从10号archivelog开始,但需要恢复到16号文件,目前缺少12,14文件.

 

查找一下12-14文件的位置,进行确认.

RMAN> list archivelog low sequence 12 high sequence 14

2> ;

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

Key Thrd Seq S Low Time
------- ---- ------- - ---------
7 1 12 A 18-JUN-16
Name: /u01/app/oracle/flash_recovery_area/ORCL/archivelog/2016_06_18/o1_mf_1_12_cpb2xhg8_.arc

8 1 13 A 18-JUN-16
Name: /u01/app/oracle/flash_recovery_area/ORCL/archivelog/2016_06_18/o1_mf_1_13_cpb35zgs_.arc

9 1 14 A 18-JUN-16
Name: /u01/app/oracle/flash_recovery_area/ORCL/archivelog/2016_06_18/o1_mf_1_14_cpb36dbo_.arc

 

只能不完全恢复到12

shutdown abort;

starup force mount;

 

RMAN> run { 2> set until sequence 12; 3> restore database; 4> } executing command: SET until clause Starting restore at 18-JUN-16 using channel ORA_DISK_1 flashing back control file to SCN 1080714 channel ORA_DISK_1: starting datafile backup set restore channel ORA_DISK_1: specifying datafile(s) to restore from backup set channel ORA_DISK_1: restoring datafile 00001 to /u01/app/oracle/oradata/orcl/system01.dbf channel ORA_DISK_1: restoring datafile 00002 to /u01/app/oracle/oradata/orcl/sysaux01.dbf channel ORA_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/orcl/undotbs01.dbf channel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/orcl/users01.dbf channel ORA_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/orcl/example01.dbf channel ORA_DISK_1: restoring datafile 00006 to /u01/app/oracle/oradata/orcl/test01.dbf channel ORA_DISK_1: reading from backup piece /home/oracle/backup/back_full_05r8fcon_1_1_20160618 channel ORA_DISK_1: piece handle=/home/oracle/backup/back_full_05r8fcon_1_1_20160618 tag=BACK_FULL channel ORA_DISK_1: restored backup piece 1 channel ORA_DISK_1: restore complete, elapsed time: 00:00:35 Finished restore at 18-JUN-16 RMAN> run { 2> set until sequence 12; 3> recover database; 4> } executing command: SET until clause Starting recover at 18-JUN-16 using channel ORA_DISK_1 starting media recovery channel ORA_DISK_1: starting archived log restore to default destination channel ORA_DISK_1: restoring archived log archived log thread=1 sequence=10 channel ORA_DISK_1: restoring archived log archived log thread=1 sequence=11 channel ORA_DISK_1: reading from backup piece /home/oracle/backup/arch_07r8fcti_1_1_20160618 channel ORA_DISK_1: piece handle=/home/oracle/backup/arch_07r8fcti_1_1_20160618 tag=ARC_BACK channel ORA_DISK_1: restored backup piece 1 channel ORA_DISK_1: restore complete, elapsed time: 00:00:01 archived log file name=/u01/app/oracle/flash_recovery_area/ORCL/archivelog/2016_06_18/o1_mf_1_10_cpb4clcf_.arc thread=1 sequence=10 channel default: deleting archived log(s) archived log file name=/u01/app/oracle/flash_recovery_area/ORCL/archivelog/2016_06_18/o1_mf_1_10_cpb4clcf_.arc RECID=20 STAMP=914865395 archived log file name=/u01/app/oracle/flash_recovery_area/ORCL/archivelog/2016_06_18/o1_mf_1_11_cpb4clcl_.arc thread=1 sequence=11 channel default: deleting archived log(s) archived log file name=/u01/app/oracle/flash_recovery_area/ORCL/archivelog/2016_06_18/o1_mf_1_11_cpb4clcl_.arc RECID=19 STAMP=914865394 media recovery complete, elapsed time: 00:00:00 Finished recover at 18-JUN-16 RMAN> alter database open resetlogs; database opened

 

用scott/tiger登录后查看,发现插入的数据不在了.