rman基于SCN的不完全恢复

本文描述：通过日志挖掘来恢复被删对象的过程
试验过程：

注：试验前先将数据库全备或者0级备份
全备：backup database format 'g:\rmanbak\db_%d_%T_%s.bak'
plus archivelog format 'g:\rmanbak\arch_%d_%T_%s.bak';

0级备份：backup incremental level 0  database format 'g:\rmanbak\db_%d_%T_%s.bak'
plus archivelog format 'g:\rmanbak\arch_%d_%T_%s.bak';

(1)删除Scott用户的表emp，并创建表t2

C:\Users\Administrator>sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on 星期三 6月 14 15:30:29 2017

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> conn scott/tiger
Connected.
SQL> select * from tab;

TNAME                          TABTYPE  CLUSTERID
------------------------------ ------- ----------
BONUS                          TABLE
DEPT                           TABLE
EMP                            TABLE
SALGRADE                       TABLE

SQL> drop table emp purge;

Table dropped.

SQL> create table t2 tablespace tt as select * from dept;

Table created.

SQL> select * from tab;

TNAME                          TABTYPE  CLUSTERID
------------------------------ ------- ----------
BONUS                          TABLE
DEPT                           TABLE
SALGRADE                       TABLE
T2                             TABLE

(2)通过日志挖掘找到删除表emp的SCN，取SCN=SCN-1为未删除表emp时的数据库状态

SQL> conn / as sysdba
Connected.
SQL> select 'exec dbms_logmnr.add_logfile('''||member||''')' from v$logfile;

'EXECDBMS_LOGMNR.ADD_LOGFILE('''||MEMBER||''')'
--------------------------------------------------------------------------------
exec dbms_logmnr.add_logfile('F:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO03.LOG')
exec dbms_logmnr.add_logfile('F:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO02.LOG')
exec dbms_logmnr.add_logfile('F:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO01.LOG')

SQL> exec dbms_logmnr.add_logfile('F:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO03.LOG');

PL/SQL procedure successfully completed.

SQL> exec dbms_logmnr.add_logfile('F:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO02.LOG');

PL/SQL procedure successfully completed.

SQL> exec dbms_logmnr.add_logfile('F:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO01.LOG');

PL/SQL procedure successfully completed.

SQL> exec dbms_logmnr.start_logmnr();

PL/SQL procedure successfully completed.

SQL> select scn,sql_redo from v$logmnr_contents
2  where seg_name='EMP'
3  and seg_owner='SCOTT'
4  and sql_redo like '%drop table emp%';

no rows selected
SQL> exec dbms_logmnr.add_logfile('F:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO03.LOG');

PL/SQL procedure successfully completed.

SQL> exec dbms_logmnr.add_logfile('F:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO02.LOG');

PL/SQL procedure successfully completed.

SQL> exec dbms_logmnr.add_logfile('F:\APP\ADMINISTRATOR\ORADATA\ORCL\REDO01.LOG');

PL/SQL procedure successfully completed.

SQL> exec dbms_logmnr.start_logmnr();

PL/SQL procedure successfully completed.

SQL> select scn,sql_redo from v$logmnr_contents
2  where seg_name='EMP'
3  and seg_owner='SCOTT'
4  and sql_redo like '%drop table emp%';

SCN          SQL_REDO
---------------         ---------------------------------
1378007         drop table emp purge;

SQL>

(3)登录rman进行恢复

C:\Users\Administrator>rman target /

Recovery Manager: Release 11.2.0.1.0 - Production on 星期三 6月 14 15:11:55 2017

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.

connected to target database: ORCL (DBID=1468451227)

RMAN> run{
2> shutdown immediate
3> startup mount
4> set until scn=1378007;
5> restore database;
6> recover database;
7> sql 'alter database open resetlogs';
8> }

database closed
database dismounted
Oracle instance shut down

connected to target database (not started)
Oracle instance started
database mounted

Total System Global Area     430075904 bytes

Fixed Size                     2176448 bytes
Variable Size                322964032 bytes
Database Buffers              96468992 bytes
Redo Buffers                   8466432 bytes

executing command: SET until clause

Starting restore at 14-6月 -17
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=63 device type=DISK

creating datafile file number=12 name=F:\ORADATA\TT01.DBF
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 F:\APP\ADMINISTRATOR\ORADATA\ORCL\SYSTEM01.DBF
channel ORA_DISK_1: restoring datafile 00002 to F:\APP\ADMINISTRATOR\ORADATA\ORCL\SYSAUX01.DBF
channel ORA_DISK_1: restoring datafile 00003 to F:\APP\ADMINISTRATOR\ORADATA\ORCL\UNDOTBS01.DBF
channel ORA_DISK_1: restoring datafile 00004 to F:\APP\ADMINISTRATOR\ORADATA\ORCL\USERS01.DBF
channel ORA_DISK_1: restoring datafile 00005 to F:\APP\ADMINISTRATOR\ORADATA\ORCL\EXAMPLE01.DBF
channel ORA_DISK_1: restoring datafile 00006 to F:\ORADATA\BASE_DATA01.DBF
channel ORA_DISK_1: restoring datafile 00007 to F:\ORADATA\BASE_INDEX01.DBF
channel ORA_DISK_1: restoring datafile 00008 to F:\ORADATA\MATCH_DATA01.DBF
channel ORA_DISK_1: restoring datafile 00009 to F:\ORADATA\MATCH_INDEX01.DBF
channel ORA_DISK_1: restoring datafile 00010 to F:\ORADATA\MATCHDETAIL_DATA01.DBF
channel ORA_DISK_1: restoring datafile 00011 to F:\ORADATA\MATCHDETAIL_INDEX01.DBF
channel ORA_DISK_1: reading from backup piece G:\RMANBP\FDB_ORCL_20170613_14.BAK
channel ORA_DISK_1: piece handle=G:\RMANBP\FDB_ORCL_20170613_14.BAK tag=TAG20170613T123834
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:04:36
Finished restore at 14-6月 -17

Starting recover at 14-6月 -17
using channel ORA_DISK_1

starting media recovery

archived log for thread 1 with sequence 74 is already on disk as file F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_13\O1_MF_1_74_D
MYVCR6Q_.ARC
archived log for thread 1 with sequence 75 is already on disk as file F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_13\O1_MF_1_75_D
MYVTGMD_.ARC
archived log for thread 1 with sequence 76 is already on disk as file F:\APP\ADMINISTRATOR
4000
\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_13\O1_MF_1_76_D
MZ8PWJ1_.ARC
archived log for thread 1 with sequence 77 is already on disk as file F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_77_D
N155JPS_.ARC
archived log for thread 1 with sequence 78 is already on disk as file F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_78_D
N16YS6W_.ARC
archived log for thread 1 with sequence 79 is already on disk as file F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_79_D
N17JN2C_.ARC
archived log for thread 1 with sequence 80 is already on disk as file F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_80_D
N17RDDN_.ARC
archived log for thread 1 with sequence 81 is already on disk as file F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_81_D
N1FMP5Z_.ARC
archived log for thread 1 with sequence 82 is already on disk as file F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_82_D
N1HKJSX_.ARC
archived log for thread 1 with sequence 83 is already on disk as file F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_83_D
N1Q41L1_.ARC
archived log file name=F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_13\O1_MF_1_74_DMYVCR6Q_.ARC thread=1 sequence=74
archived log file name=F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_13\O1_MF_1_75_DMYVTGMD_.ARC thread=1 sequence=75
archived log file name=F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_13\O1_MF_1_76_DMZ8PWJ1_.ARC thread=1 sequence=76
archived log file name=F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_77_DN155JPS_.ARC thread=1 sequence=77
archived log file name=F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_78_DN16YS6W_.ARC thread=1 sequence=78
archived log file name=F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_79_DN17JN2C_.ARC thread=1 sequence=79
archived log file name=F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_80_DN17RDDN_.ARC thread=1 sequence=80
archived log file name=F:\APP\ADMINISTRATOR\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\2017_06_14\O1_MF_1_81_DN1FMP5Z_.ARC thread=1 sequence=81
media recovery complete, elapsed time: 00:00:23
Finished recover at 14-6月 -17

sql statement: alter database open resetlogs

RMAN>

(4)登录Scott，查询恢复结果

SQL> conn scott/tiger
Connected.
SQL> select * from tab;

TNAME                          TABTYPE  CLUSTERID
------------------------------ ------- ----------
BONUS                          TABLE
DEPT                           TABLE
EMP                            TABLE
SALGRADE                       TABLE

SQL>

恢复成功！