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Oracle 12c Recover Table New Feature

原创 Linux操作系统 作者:DBA_oracle_java 时间:2013-07-17 14:32:30 0 删除 编辑

Oracle 12c Recover Table New Feature

Oracle12cR1开始,oracle支持Recover table。在之前的版本中,如果想基于某个时间点恢复表需要关闭数据库做恢复,或者使用flashback技术来闪回。12cR1中的Recover table可以在数据库联机的情况下对数据库的某些表做恢复。

  其执行恢复的大致流程如下:

 1.确认你需要恢复表的时间点在备份中存在。

2.创建一个辅助的实例(auxiliary database),并且将你指定恢复的表恢复到这个实例里面。

3.使用数据泵(Data Pump)导出指定状态表的数据。

4.使用数据泵导入步骤3中导出的表数据到tartget database(可选项)

5.重名名表或表空间(可选项)

 

演示过程:

 

1.全备数据库

RMAN> backup incremental level 0 database format '/RECO/rman/backup_%d%T%s.bak' plus archivelog format '/RECO/rman/arc_%d%T%s.bak';

 

Starting backup at 17-JUL-13

current log archived

using target database control file instead of recovery catalog

allocated channel: ORA_DISK_1

channel ORA_DISK_1: SID=269 device type=DISK

channel ORA_DISK_1: starting archived log backup set

channel ORA_DISK_1: specifying archived log(s) in backup set

input archived log thread=1 sequence=38 RECID=27 STAMP=821018028

channel ORA_DISK_1: starting piece 1 at 17-JUL-13

channel ORA_DISK_1: finished piece 1 at 17-JUL-13

piece handle=/RECO/rman/arc_DB12C2013071728.bak tag=TAG20130717T123349 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:02

Finished backup at 17-JUL-13

 

Starting backup at 17-JUL-13

using channel ORA_DISK_1

channel ORA_DISK_1: starting incremental level 0 datafile backup set

channel ORA_DISK_1: specifying datafile(s) in backup set

input datafile file number=00003 name=/ORADATA/DB12C/datafile/o1_mf_sysaux_8x51lc6k_.dbf

input datafile file number=00001 name=/ORADATA/DB12C/datafile/o1_mf_system_8x51qtpc_.dbf

input datafile file number=00004 name=/ORADATA/DB12C/datafile/o1_mf_undotbs1_8x51wr6g_.dbf

input datafile file number=00002 name=/ORADATA/DB12C/datafile/db12c01.dbf

input datafile file number=00006 name=/ORADATA/DB12C/datafile/o1_mf_users_8x51wp8d_.dbf

channel ORA_DISK_1: starting piece 1 at 17-JUL-13

channel ORA_DISK_1: finished piece 1 at 17-JUL-13

piece handle=/RECO/rman/backup_DB12C2013071729.bak tag=TAG20130717T123351 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:02:17

channel ORA_DISK_1: starting incremental level 0 datafile backup set

channel ORA_DISK_1: specifying datafile(s) in backup set

including current control file in backup set

including current SPFILE in backup set

channel ORA_DISK_1: starting piece 1 at 17-JUL-13

channel ORA_DISK_1: finished piece 1 at 17-JUL-13

piece handle=/RECO/rman/backup_DB12C2013071730.bak tag=TAG20130717T123351 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01

Finished backup at 17-JUL-13

 

Starting backup at 17-JUL-13

current log archived

using channel ORA_DISK_1

channel ORA_DISK_1: starting archived log backup set

channel ORA_DISK_1: specifying archived log(s) in backup set

input archived log thread=1 sequence=39 RECID=28 STAMP=821018172

channel ORA_DISK_1: starting piece 1 at 17-JUL-13

channel ORA_DISK_1: finished piece 1 at 17-JUL-13

piece handle=/RECO/rman/arc_DB12C2013071731.bak tag=TAG20130717T123612 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01

Finished backup at 17-JUL-13

 

2.查询测试数据

2.1查询当前SCN号及系统时间

SQL>select       dbms_flashback.get_system_change_number      CURRENT_SCN, to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') CURRENT_TIME FROM DUAL;

 

CURRENT_SCN   CURRENT_TIME

-----------           -------------------

1932621       2013-07-17 13:10:28

 

2.2查询当前表数据

SQL> SELECT * FROM DB12C.T;

 

        ID NAME

---------- ----------

         1 SZSCKJ.COM

         2 SZSCKJ.COM

 

3.修改测试数据

SQL> INSERT INTO DB12C.T VALUES(3,'SZSCKJ.COM');

 

1 row created.

 

SQL> INSERT INTO DB12C.T VALUES(4,'SZSCKJ.COM');

 

1 row created.

 

SQL> INSERT INTO DB12C.T VALUES(5,'SZSCKJ.COM');

 

1 row created.

 

SQL> INSERT INTO DB12C.T VALUES(6,'SZSCKJ.COM');

 

1 row created.

 

SQL> COMMIT;

 

Commit complete.

 

SQL> select dbms_flashback.get_system_change_number CURRENT_SCN,to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') CURRENT_TIME FROM DUAL;

 

CURRENT_SCN CURRENT_TIME

----------- -------------------

    1932709 2013-07-17 13:13:05

 

SQL> SELECT * FROM DB12C.T;

 

        ID NAME

---------- ----------

         1 SZSCKJ.COM

         2 SZSCKJ.COM

         3 SZSCKJ.COM

         4 SZSCKJ.COM

         5 SZSCKJ.COM

         6 SZSCKJ.COM

 

6 rows selected        

 

 

4.确认归档模式

SQL> archive log list;

Database log mode              Archive Mode

Automatic archival             Enabled

Archive destination            /RECO/arch/DB12c

Oldest online log sequence     38

Next log sequence to archive   40

Current log sequence           40

 

5.Recover table

##Start RMAN and connect as TARGET to the target database. You must connect as a

user with the SYSBACKUP or SYSDBA privilege.

这边需要注意的是,需要使用具有sysbackup or sysdba的权限登录rman,即

rman target sys/passwd.不能使用rman target /来连接Recovery Manager

 

oracle@DB12c:/tmp/oracle/recover>rman target sys/oracle

 

Recovery Manager: Release 12.1.0.1.0 - Production on Wed Jul 17 13:23:35 2013

 

Copyright (c) 1982, 2013, Oracle and/or its affiliates.  All rights reserved.

 

connected to target database: DB12C (DBID=1273758963)

 

RMAN> RECOVER TABLE DB12C.T

2>  UNTIL SCN 1932621

3>  AUXILIARY DESTINATION '/tmp/oracle/recover'

4>  REMAP TABLE 'DB12C'.'T':'T_HISTORY_20130717';

 

Starting recover at 17-JUL-13

current log archived

allocated channel: ORA_DISK_1

channel ORA_DISK_1: SID=32 device type=DISK

RMAN-05026: WARNING: presuming following set of tablespaces applies to specified Point-in-Time

 

List of tablespaces expected to have UNDO segments

Tablespace SYSTEM

Tablespace UNDOTBS1

 

Creating automatic instance, with SID='qpxE'  -----这里开始创建auxiliary instance

 

initialization parameters used for automatic instance:

db_name=DB12C

db_unique_name=qpxE_pitr_DB12C

compatible=12.1.0.0.0

db_block_size=8192

db_files=200

sga_target=1G

processes=80

diagnostic_dest=/u01/app/oracle

db_create_file_dest=/tmp/oracle/recover

log_archive_dest_1='location=/tmp/oracle/recover'

#No auxiliary parameter file used

 

 

starting up automatic instance DB12C

 

Oracle instance started

 

Total System Global Area    1068937216 bytes

 

Fixed Size                     2296576 bytes

Variable Size                281019648 bytes

Database Buffers             780140544 bytes

Redo Buffers                   5480448 bytes

Automatic instance created

 

contents of Memory Script.:

{

# set requested point in time

set until  scn 1932621;

# restore the controlfile

restore clone controlfile;

# mount the controlfile

sql clone 'alter database mount clone database';

# archive current online log

sql 'alter system archive log current';

}

executing Memory Script

 

executing command: SET until clause

 

Starting restore at 17-JUL-13

allocated channel: ORA_AUX_DISK_1

channel ORA_AUX_DISK_1: SID=11 device type=DISK

 

channel ORA_AUX_DISK_1: starting datafile backup set restore

channel ORA_AUX_DISK_1: restoring control file

channel ORA_AUX_DISK_1: reading from backup piece /RECO/rman/backup_DB12C2013071730.bak

channel ORA_AUX_DISK_1: piece handle=/RECO/rman/backup_DB12C2013071730.bak tag=TAG20130717T123351

channel ORA_AUX_DISK_1: restored backup piece 1

channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:02

output file name=/tmp/oracle/recover/DB12C/controlfile/o1_mf_8ydd5v1y_.ctl

Finished restore at 17-JUL-13

 

sql statement: alter database mount clone database

 

sql statement: alter system archive log current

 

contents of Memory Script.:

{

# set requested point in time

set until  scn 1932621;

# set destinations for recovery set and auxiliary set datafiles

set newname for clone datafile  1 to new;

set newname for clone datafile  4 to new;

set newname for clone datafile  3 to new;

set newname for clone tempfile  1 to new;

# switch all tempfiles

switch clone tempfile all;

# restore the tablespaces in the recovery set and the auxiliary set

restore clone datafile  1, 4, 3;

switch clone datafile all;

}

executing Memory Script

 

executing command: SET until clause

 

executing command: SET NEWNAME

 

executing command: SET NEWNAME

 

executing command: SET NEWNAME

 

executing command: SET NEWNAME

 

renamed tempfile 1 to /tmp/oracle/recover/DB12C/datafile/o1_mf_temp_%u_.tmp in control file

 

Starting restore at 17-JUL-13     -----restore database

using channel ORA_AUX_DISK_1

 

channel ORA_AUX_DISK_1: starting datafile backup set restore

channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set

channel ORA_AUX_DISK_1: restoring datafile 00001 to /tmp/oracle/recover/DB12C/datafile/o1_mf_system_%u_.dbf

channel ORA_AUX_DISK_1: restoring datafile 00004 to /tmp/oracle/recover/DB12C/datafile/o1_mf_undotbs1_%u_.dbf

channel ORA_AUX_DISK_1: restoring datafile 00003 to /tmp/oracle/recover/DB12C/datafile/o1_mf_sysaux_%u_.dbf

channel ORA_AUX_DISK_1: reading from backup piece /RECO/rman/backup_DB12C2013071729.bak

channel ORA_AUX_DISK_1: piece handle=/RECO/rman/backup_DB12C2013071729.bak tag=TAG20130717T123351

channel ORA_AUX_DISK_1: restored backup piece 1

channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:03:05

Finished restore at 17-JUL-13

 

datafile 1 switched to datafile copy

input datafile copy RECID=4 STAMP=821022844 file name=/tmp/oracle/recover/DB12C/datafile/o1_mf_system_8ydd62nz_.dbf

datafile 4 switched to datafile copy

input datafile copy RECID=5 STAMP=821022844 file name=/tmp/oracle/recover/DB12C/datafile/o1_mf_undotbs1_8ydd62o6_.dbf

datafile 3 switched to datafile copy

input datafile copy RECID=6 STAMP=821022844 file name=/tmp/oracle/recover/DB12C/datafile/o1_mf_sysaux_8ydd62ns_.dbf

 

contents of Memory Script.:

{

# set requested point in time

set until  scn 1932621;

# online the datafiles restored or switched

sql clone "alter database datafile  1 online";

sql clone "alter database datafile  4 online";

sql clone "alter database datafile  3 online";

# recover and open database read only

recover clone database tablespace  "SYSTEM", "UNDOTBS1", "SYSAUX";

sql clone 'alter database open read only';

}

executing Memory Script

 

executing command: SET until clause

 

sql statement: alter database datafile  1 online

 

sql statement: alter database datafile  4 online

 

sql statement: alter database datafile  3 online

 

Starting recover at 17-JUL-13

using channel ORA_AUX_DISK_1

 

starting media recovery    ----recover

 

archived log for thread 1 with sequence 39 is already on disk as file /RECO/arch/DB12c/1_39_819734199.dbf

archived log for thread 1 with sequence 40 is already on disk as file /RECO/arch/DB12c/1_40_819734199.dbf

archived log file name=/RECO/arch/DB12c/1_39_819734199.dbf thread=1 sequence=39

archived log file name=/RECO/arch/DB12c/1_40_819734199.dbf thread=1 sequence=40

media recovery complete, elapsed time: 00:00:08

Finished recover at 17-JUL-13

 

sql statement: alter database open read only

 

contents of Memory Script.:

{

   sql clone "create spfile from memory";

   shutdown clone immediate;

   startup clone nomount;

   sql clone "alter system set  control_files =

  ''/tmp/oracle/recover/DB12C/controlfile/o1_mf_8ydd5v1y_.ctl'' comment=

 ''RMAN set'' scope=spfile";

   shutdown clone immediate;

   startup clone nomount;

# mount database

sql clone 'alter database mount clone database';

}

executing Memory Script

 

sql statement: create spfile from memory

 

database closed

database dismounted

Oracle instance shut down

 

connected to auxiliary database (not started)

Oracle instance started

 

Total System Global Area    1068937216 bytes

 

Fixed Size                     2296576 bytes

Variable Size                285213952 bytes

Database Buffers             775946240 bytes

Redo Buffers                   5480448 bytes

 

sql statement: alter system set  control_files =   ''/tmp/oracle/recover/DB12C/controlfile/o1_mf_8ydd5v1y_.ctl'' comment= ''RMAN set'' scope=spfile

 

Oracle instance shut down

 

connected to auxiliary database (not started)

Oracle instance started

 

Total System Global Area    1068937216 bytes

 

Fixed Size                     2296576 bytes

Variable Size                285213952 bytes

Database Buffers             775946240 bytes

Redo Buffers                   5480448 bytes

 

sql statement: alter database mount clone database

 

contents of Memory Script.:

{

# set requested point in time

set until  scn 1932621;

# set destinations for recovery set and auxiliary set datafiles

set newname for datafile  2 to new;

# restore the tablespaces in the recovery set and the auxiliary set

restore clone datafile  2;

switch clone datafile all;

}

executing Memory Script

 

executing command: SET until clause

 

executing command: SET NEWNAME

 

Starting restore at 17-JUL-13

allocated channel: ORA_AUX_DISK_1

channel ORA_AUX_DISK_1: SID=11 device type=DISK

 

channel ORA_AUX_DISK_1: starting datafile backup set restore

channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set

channel ORA_AUX_DISK_1: restoring datafile 00002 to /tmp/oracle/recover/QPXE_PITR_DB12C/datafile/o1_mf_db12c_%u_.dbf

channel ORA_AUX_DISK_1: reading from backup piece /RECO/rman/backup_DB12C2013071729.bak

channel ORA_AUX_DISK_1: piece handle=/RECO/rman/backup_DB12C2013071729.bak tag=TAG20130717T123351

channel ORA_AUX_DISK_1: restored backup piece 1

channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:15

Finished restore at 17-JUL-13

 

datafile 2 switched to datafile copy

input datafile copy RECID=8 STAMP=821022919 file name=/tmp/oracle/recover/QPXE_PITR_DB12C/datafile/o1_mf_db12c_8yddfr1t_.dbf

 

contents of Memory Script.:

{

# set requested point in time

set until  scn 1932621;

# online the datafiles restored or switched

sql clone "alter database datafile  2 online";

# recover and open resetlogs

recover clone database tablespace  "DB12C", "SYSTEM", "UNDOTBS1", "SYSAUX" delete archivelog;

alter clone database open resetlogs;

}

executing Memory Script

 

executing command: SET until clause

 

sql statement: alter database datafile  2 online

 

Starting recover at 17-JUL-13

using channel ORA_AUX_DISK_1

 

starting media recovery

 

archived log for thread 1 with sequence 39 is already on disk as file /RECO/arch/DB12c/1_39_819734199.dbf

archived log for thread 1 with sequence 40 is already on disk as file /RECO/arch/DB12c/1_40_819734199.dbf

archived log file name=/RECO/arch/DB12c/1_39_819734199.dbf thread=1 sequence=39

archived log file name=/RECO/arch/DB12c/1_40_819734199.dbf thread=1 sequence=40

media recovery complete, elapsed time: 00:00:00

Finished recover at 17-JUL-13

 

database opened

 

contents of Memory Script.:

{

# create directory for datapump import      -----使用数据泵导出相关数据

sql "create or replace directory TSPITR_DIROBJ_DPDIR as ''   

/tmp/oracle/recover''";

# create directory for datapump export

sql clone "create or replace directory TSPITR_DIROBJ_DPDIR as ''

/tmp/oracle/recover''";

}

executing Memory Script

 

sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''/tmp/oracle/recover''

 

sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''/tmp/oracle/recover''

 

Performing export of tables...

   EXPDP> Starting "SYS"."TSPITR_EXP_qpxE_qCee": 

   EXPDP> Estimate in progress using BLOCKS method...

   EXPDP> Processing object type TABLE_EXPORT/TABLE/TABLE_DATA

   EXPDP> Total estimation using BLOCKS method: 64 KB

   EXPDP> Processing object type TABLE_EXPORT/TABLE/TABLE

   EXPDP> Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS

   EXPDP> Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER

   EXPDP> . . exported "DB12C"."T"                                 5.492 KB       2 rows

   EXPDP> Master table "SYS"."TSPITR_EXP_qpxE_qCee" successfully loaded/unloaded

   EXPDP> ******************************************************************************

   EXPDP> Dump file set for SYS.TSPITR_EXP_qpxE_qCee is:

   EXPDP>   /tmp/oracle/recover/tspitr_qpxE_29472.dmp

   EXPDP> Job "SYS"."TSPITR_EXP_qpxE_qCee" successfully completed at Wed Jul 17 13:57:26 2013 elapsed 0 00:00:49

Export completed

 

 

contents of Memory Script.:

{

# shutdown clone before import

shutdown clone abort

}

executing Memory Script

 

Oracle instance shut down

 

Performing import of tables...                                -------target database导入数据

   IMPDP> Master table "SYS"."TSPITR_IMP_qpxE_qbDD" successfully loaded/unloaded

   IMPDP> Starting "SYS"."TSPITR_IMP_qpxE_qbDD": 

   IMPDP> Processing object type TABLE_EXPORT/TABLE/TABLE

   IMPDP> Processing object type TABLE_EXPORT/TABLE/TABLE_DATA

   IMPDP> . . imported "DB12C"."T_HISTORY_20130717"                5.492 KB       2 rows

   IMPDP> Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS

   IMPDP> Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER

   IMPDP> Job "SYS"."TSPITR_IMP_qpxE_qbDD" successfully completed at Wed Jul 17 13:58:35 2013 elapsed 0 00:00:47

Import completed

 

 

Removing automatic instance

Automatic instance removed                    ------服务还挺贴心,帮你清理好战场

auxiliary instance file /tmp/oracle/recover/DB12C/datafile/o1_mf_temp_8yddddf0_.tmp deleted

auxiliary instance file /tmp/oracle/recover/QPXE_PITR_DB12C/onlinelog/o1_mf_3_8yddgl7j_.log deleted

auxiliary instance file /tmp/oracle/recover/QPXE_PITR_DB12C/onlinelog/o1_mf_2_8yddgg1f_.log deleted

auxiliary instance file /tmp/oracle/recover/QPXE_PITR_DB12C/onlinelog/o1_mf_1_8yddg97b_.log deleted

auxiliary instance file /tmp/oracle/recover/QPXE_PITR_DB12C/datafile/o1_mf_db12c_8yddfr1t_.dbf deleted

auxiliary instance file /tmp/oracle/recover/DB12C/datafile/o1_mf_sysaux_8ydd62ns_.dbf deleted

auxiliary instance file /tmp/oracle/recover/DB12C/datafile/o1_mf_undotbs1_8ydd62o6_.dbf deleted

auxiliary instance file /tmp/oracle/recover/DB12C/datafile/o1_mf_system_8ydd62nz_.dbf deleted

auxiliary instance file /tmp/oracle/recover/DB12C/controlfile/o1_mf_8ydd5v1y_.ctl deleted

auxiliary instance file tspitr_qpxE_29472.dmp deleted

Finished recover at 17-JUL-13

 

 

 

6.确认数据

SQL> select * from DB12C.T_HISTORY_20130717;

 

        ID NAME

---------- ----------

         1 SZSCKJ.COM

         2 SZSCKJ.COM

 

 

 

总结:这个新特性好处不用说,弊端就是实质上是在你的系统里面再起一个实例来做不完全恢复,然后再给你导入到target database里面,对资源的消耗比较厉害。




By Guanghui_Zhou

来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/26169542/viewspace-766487/,如需转载,请注明出处,否则将追究法律责任。

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