RECOVER TABLE USING RMAN

Drop a table as a matter of simulation

SQL> drop table test1.regions;

Table dropped.

SQL> select * from test1.regions;

select * from test1.regions
                    *
ERROR at line 1:
ORA-00942: table or view does not exist

Starting from oracle 12c,there is recover table feature which can recover the particular accidentally modified or dropped table to the previous point in time.

This feature is an alternative to flashback feature which has its own advantage and disadvantage

This feature needs backup to be taken and cannot be used in restoring the table to the recent changes which can be solved by flashback

Below is an example simulation of this feature

I purposefully pasted the whole output so that the steps performed by RMAN are important to understand

WARNING: This method requires sufficient space in the disk equal to the tablespace size.whichever table that you recover and the tablespace where the table exist both space should be considered.

check tablespace size where table reside


SQL> select bytes/1073741824 as SIZE_IN_GB,TABLESPACE_NAME from dba_data_files where TABLESPACE_NAME='USERS';

SIZE_IN_GB TABLESPACE_NAME
---------- ------------------------------
 6.9934082 USERS

Find the tablespace of corrupted table

SQL> @colformat.sql



Procedure created.


Procedure created.


SQL> select table_name,tablespace_name from dba_tables where table_name='REGIONS';

TABLE_NAME      TABLESPACE_NAME
--------------- ---------------
REGIONS         USERS

check corrupted table size

SQL> select bytes/1024 as SIZE_IN_KB from dba_segments where segment_name='REGIONS';

SIZE_IN_KB
----------
        64

Recover table command

RMAN> recover table test1.regions until time "to_date('25-FEB-21 19:20:00','dd-mon-yy hh24:mi:ss')" auxiliary destination '/home/oracle';

Starting recover at 25-FEB-21
using target database control file instead of recovery catalog
current log archived
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=62 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='sobu'

initialization parameters used for automatic instance:
db_name=ORCL19X
db_unique_name=sobu_pitr_ORCL19X
compatible=12.1.0.2.0
db_block_size=8192
db_files=200
diagnostic_dest=/apps01/base
_system_trig_enabled=FALSE
sga_target=1504M
processes=120
db_create_file_dest=/home/oracle
log_archive_dest_1='location=/home/oracle'
#No auxiliary parameter file used


starting up automatic instance ORCL19X

Oracle instance started

Total System Global Area    1577058304 bytes

Fixed Size                     2924832 bytes
Variable Size                402656992 bytes
Database Buffers            1157627904 bytes
Redo Buffers                  13848576 bytes
Automatic instance created

contents of Memory Script:
{
# set requested point in time
set until  time "to_date('25-FEB-21 19:20:00','dd-mon-yy hh24:mi:ss')";
# 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 25-FEB-21
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=20 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 /apps01/product/12.1.0/dbhome_1/dbs/04vo2gsh_1_1
channel ORA_AUX_DISK_1: piece handle=/apps01/product/12.1.0/dbhome_1/dbs/04vo2gsh_1_1 tag=TAG20210225T102357
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:04
output file name=/home/oracle/ORCL19X/controlfile/o1_mf_j3hcc0dy_.ctl
Finished restore at 25-FEB-21

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  time "to_date('25-FEB-21 19:20:00','dd-mon-yy hh24:mi:ss')";
# set destinations for recovery set and auxiliary set datafiles
set newname for clone datafile  1 to new;
set newname for clone datafile  9 to new;
set newname for clone datafile  4 to new;
set newname for clone datafile  3 to new;
set newname for clone datafile  8 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, 9, 4, 3, 8;

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

executing command: SET NEWNAME

executing command: SET NEWNAME

renamed tempfile 1 to /home/oracle/ORCL19X/datafile/o1_mf_temp_%u_.tmp in control file

Starting restore at 25-FEB-21
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 /home/oracle/ORCL19X/datafile/o1_mf_system_%u_.dbf
channel ORA_AUX_DISK_1: restoring datafile 00009 to /home/oracle/ORCL19X/datafile/o1_mf_system_%u_.dbf
channel ORA_AUX_DISK_1: restoring datafile 00004 to /home/oracle/ORCL19X/datafile/o1_mf_undotbs1_%u_.dbf
channel ORA_AUX_DISK_1: restoring datafile 00003 to /home/oracle/ORCL19X/datafile/o1_mf_sysaux_%u_.dbf
channel ORA_AUX_DISK_1: restoring datafile 00008 to /home/oracle/ORCL19X/datafile/o1_mf_sysaux_%u_.dbf
channel ORA_AUX_DISK_1: reading from backup piece /apps01/product/12.1.0/dbhome_1/dbs/03vo2glu_1_1
channel ORA_AUX_DISK_1: piece handle=/apps01/product/12.1.0/dbhome_1/dbs/03vo2glu_1_1 tag=TAG20210225T102357
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:03:20
Finished restore at 25-FEB-21

datafile 1 switched to datafile copy
input datafile copy RECID=15 STAMP=1065468835 file name=/home/oracle/ORCL19X/datafile/o1_mf_system_j3hcd1lg_.dbf
datafile 9 switched to datafile copy
input datafile copy RECID=16 STAMP=1065468836 file name=/home/oracle/ORCL19X/datafile/o1_mf_system_j3hcd2bn_.dbf
datafile 4 switched to datafile copy
input datafile copy RECID=17 STAMP=1065468837 file name=/home/oracle/ORCL19X/datafile/o1_mf_undotbs1_j3hcd1yg_.dbf
datafile 3 switched to datafile copy
input datafile copy RECID=18 STAMP=1065468838 file name=/home/oracle/ORCL19X/datafile/o1_mf_sysaux_j3hcd146_.dbf
datafile 8 switched to datafile copy
input datafile copy RECID=19 STAMP=1065468839 file name=/home/oracle/ORCL19X/datafile/o1_mf_sysaux_j3hcd23d_.dbf

contents of Memory Script:
{
# set requested point in time
set until  time "to_date('25-FEB-21 19:20:00','dd-mon-yy hh24:mi:ss')";
# online the datafiles restored or switched
sql clone "alter database datafile  1 online";
sql clone "alter database datafile  9 online";
sql clone "alter database datafile  4 online";
sql clone "alter database datafile  3 online";
sql clone "alter database datafile  8 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  9 online

sql statement: alter database datafile  4 online

sql statement: alter database datafile  3 online

sql statement: alter database datafile  8 online

Starting recover at 25-FEB-21
using channel ORA_AUX_DISK_1

starting media recovery

archived log for thread 1 with sequence 78 is already on disk as file /apps01/product/12.1.0/dbhome_1/dbs/arch1_78_1060279903.dbf
archived log for thread 1 with sequence 79 is already on disk as file /apps01/product/12.1.0/dbhome_1/dbs/arch1_79_1060279903.dbf
channel ORA_AUX_DISK_1: starting archived log restore to default destination
channel ORA_AUX_DISK_1: restoring archived log
archived log thread=1 sequence=77
channel ORA_AUX_DISK_1: reading from backup piece /apps01/product/12.1.0/dbhome_1/dbs/05vo2gsu_1_1
channel ORA_AUX_DISK_1: piece handle=/apps01/product/12.1.0/dbhome_1/dbs/05vo2gsu_1_1 tag=TAG20210225T102742
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:04
archived log file name=/home/oracle/1_77_1060279903.dbf thread=1 sequence=77
archived log file name=/apps01/product/12.1.0/dbhome_1/dbs/arch1_78_1060279903.dbf thread=1 sequence=78
archived log file name=/apps01/product/12.1.0/dbhome_1/dbs/arch1_79_1060279903.dbf thread=1 sequence=79
media recovery complete, elapsed time: 00:01:32
Finished recover at 25-FEB-21

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 =
  ''/home/oracle/ORCL19X/controlfile/o1_mf_j3hcc0dy_.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    1577058304 bytes

Fixed Size                     2924832 bytes
Variable Size                402656992 bytes
Database Buffers            1157627904 bytes
Redo Buffers                  13848576 bytes

sql statement: alter system set  control_files =   ''/home/oracle/ORCL19X/controlfile/o1_mf_j3hcc0dy_.ctl'' comment= ''RMAN set'' scope=spfile

Oracle instance shut down

connected to auxiliary database (not started)
Oracle instance started

Total System Global Area    1577058304 bytes

Fixed Size                     2924832 bytes
Variable Size                402656992 bytes
Database Buffers            1157627904 bytes
Redo Buffers                  13848576 bytes

sql statement: alter database mount clone database

contents of Memory Script:
{
# set requested point in time
set until  time "to_date('25-FEB-21 19:20:00','dd-mon-yy hh24:mi:ss')";
# set destinations for recovery set and auxiliary set datafiles
set newname for datafile  6 to new;
# restore the tablespaces in the recovery set and the auxiliary set
restore clone datafile  6;

switch clone datafile all;
}
executing Memory Script

executing command: SET until clause

executing command: SET NEWNAME

Starting restore at 25-FEB-21
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=21 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 00006 to /home/oracle/SOBU_PITR_ORCL19X/datafile/o1_mf_users_%u_.dbf
channel ORA_AUX_DISK_1: reading from backup piece /apps01/product/12.1.0/dbhome_1/dbs/03vo2glu_1_1
channel ORA_AUX_DISK_1: piece handle=/apps01/product/12.1.0/dbhome_1/dbs/03vo2glu_1_1 tag=TAG20210225T102357
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:01:36
Finished restore at 25-FEB-21

datafile 6 switched to datafile copy
input datafile copy RECID=21 STAMP=1065469296 file name=/home/oracle/SOBU_PITR_ORCL19X/datafile/o1_mf_users_j3hcxq5k_.dbf

contents of Memory Script:
{
# set requested point in time
set until  time "to_date('25-FEB-21 19:20:00','dd-mon-yy hh24:mi:ss')";
# online the datafiles restored or switched
sql clone "alter database datafile  6 online";
# recover and open resetlogs
recover clone database tablespace  "USERS", "SYSTEM", "UNDOTBS1", "SYSAUX" delete archivelog;
alter clone database open resetlogs;
}
executing Memory Script

executing command: SET until clause

sql statement: alter database datafile  6 online

Starting recover at 25-FEB-21
using channel ORA_AUX_DISK_1

starting media recovery

archived log for thread 1 with sequence 78 is already on disk as file /apps01/product/12.1.0/dbhome_1/dbs/arch1_78_1060279903.dbf
archived log for thread 1 with sequence 79 is already on disk as file /apps01/product/12.1.0/dbhome_1/dbs/arch1_79_1060279903.dbf
channel ORA_AUX_DISK_1: starting archived log restore to default destination
channel ORA_AUX_DISK_1: restoring archived log
archived log thread=1 sequence=77
channel ORA_AUX_DISK_1: reading from backup piece /apps01/product/12.1.0/dbhome_1/dbs/05vo2gsu_1_1
channel ORA_AUX_DISK_1: piece handle=/apps01/product/12.1.0/dbhome_1/dbs/05vo2gsu_1_1 tag=TAG20210225T102742
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01
archived log file name=/home/oracle/1_77_1060279903.dbf thread=1 sequence=77
channel clone_default: deleting archived log(s)
archived log file name=/home/oracle/1_77_1060279903.dbf RECID=78 STAMP=1065469303
archived log file name=/apps01/product/12.1.0/dbhome_1/dbs/arch1_78_1060279903.dbf thread=1 sequence=78
archived log file name=/apps01/product/12.1.0/dbhome_1/dbs/arch1_79_1060279903.dbf thread=1 sequence=79
media recovery complete, elapsed time: 00:00:07
Finished recover at 25-FEB-21

database opened

contents of Memory Script:
{
# create directory for datapump import
sql "create or replace directory TSPITR_DIROBJ_DPDIR as ''
/home/oracle''";
# create directory for datapump export
sql clone "create or replace directory TSPITR_DIROBJ_DPDIR as ''
/home/oracle''";
}
executing Memory Script

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

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

Performing export of tables...
   EXPDP> Starting "SYS"."TSPITR_EXP_sobu_DrmC":
   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/COMMENT
   EXPDP> Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
   EXPDP> Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
   EXPDP> Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
   EXPDP> Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
   EXPDP> Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
   EXPDP> . . exported "TEST1"."REGIONS"                           5.546 KB       4 rows
   EXPDP> Master table "SYS"."TSPITR_EXP_sobu_DrmC" successfully loaded/unloaded
   EXPDP> ******************************************************************************
   EXPDP> Dump file set for SYS.TSPITR_EXP_sobu_DrmC is:
   EXPDP>   /home/oracle/tspitr_sobu_50421.dmp
   EXPDP> Job "SYS"."TSPITR_EXP_sobu_DrmC" successfully completed at Thu Feb 25 19:43:49 2021 elapsed 0 00:00:50
Export completed


contents of Memory Script:
{
# shutdown clone before import
shutdown clone abort
}
executing Memory Script

Oracle instance shut down

Performing import of tables...
   IMPDP> Master table "SYS"."TSPITR_IMP_sobu_pqnF" successfully loaded/unloaded
   IMPDP> Starting "SYS"."TSPITR_IMP_sobu_pqnF":
   IMPDP> Processing object type TABLE_EXPORT/TABLE/TABLE
   IMPDP> Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
   IMPDP> . . imported "TEST1"."REGIONS"                           5.546 KB       4 rows
   IMPDP> Processing object type TABLE_EXPORT/TABLE/COMMENT
   IMPDP> Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
   IMPDP> Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
   IMPDP> Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
   IMPDP> Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
   IMPDP> Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
   IMPDP> Job "SYS"."TSPITR_IMP_sobu_pqnF" successfully completed at Thu Feb 25 19:45:30 2021 elapsed 0 00:00:47
Import completed


Removing automatic instance
Automatic instance removed
auxiliary instance file /home/oracle/ORCL19X/datafile/o1_mf_temp_j3hcp6y2_.tmp deleted
auxiliary instance file /home/oracle/SOBU_PITR_ORCL19X/onlinelog/o1_mf_3_j3hd1h0j_.log deleted
auxiliary instance file /home/oracle/SOBU_PITR_ORCL19X/onlinelog/o1_mf_2_j3hd1d8g_.log deleted
auxiliary instance file /home/oracle/SOBU_PITR_ORCL19X/onlinelog/o1_mf_1_j3hd1798_.log deleted
auxiliary instance file /home/oracle/SOBU_PITR_ORCL19X/datafile/o1_mf_users_j3hcxq5k_.dbf deleted
auxiliary instance file /home/oracle/ORCL19X/datafile/o1_mf_sysaux_j3hcd23d_.dbf deleted
auxiliary instance file /home/oracle/ORCL19X/datafile/o1_mf_sysaux_j3hcd146_.dbf deleted
auxiliary instance file /home/oracle/ORCL19X/datafile/o1_mf_undotbs1_j3hcd1yg_.dbf deleted
auxiliary instance file /home/oracle/ORCL19X/datafile/o1_mf_system_j3hcd2bn_.dbf deleted
auxiliary instance file /home/oracle/ORCL19X/datafile/o1_mf_system_j3hcd1lg_.dbf deleted
auxiliary instance file /home/oracle/ORCL19X/controlfile/o1_mf_j3hcc0dy_.ctl deleted
auxiliary instance file tspitr_sobu_50421.dmp deleted
Finished recover at 25-FEB-21

RMAN> exit


Recovery Manager complete.

My table is back now!

SQL> select count(*) from test1.regions;

  COUNT(*)
----------
         4

SQL> select * from test1.regions;

 REGION_ID REGION_NAME
---------- -------------------------
         1 Europe
         2 Americas
         3 Asia
         4 Middle East and Africa

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