Oracle 18c – Table recovery using RMAN Backup
Description:-
In this article we are going to see table recovery using RMAN backup.
Let’s start the Demo:-
Steps to recover the table using RMAN backup :-
Step 1:- User creation
SQL> create user hari identified by "oracle" default tablespace users temporary tablespace temp profile default account unlock User created.
Step 2:- Provide grant privileges and allocate quota for “hari” user
SQL> grant create session, create table to hari Grant succeeded. SQL> alter user hari quota 500M on users User altered.
Step 3:- Table creation
SQL> conn hari/oracle SQL> create table emp(id number); Table created. SQL> begin for i in 1 .. 100000 loop insert into emp values(i); end loop; end; / PL/SQL procedure successfully completed. SQL> select count(*) from emp; COUNT(*) ---------- 100000 SQL> SELECT TO_CHAR (SYSDATE, 'MM-DD-YYYY HH24:MI:SS') "NOW" FROM DUAL; NOW ------------------- 08-14-2018 21:53:42
Step 4:- Ensure that database in ARCHIVELOG mode and take a whole database backup
SQL> archive log list Database log mode No Archive Mode Automatic archival Disabled Archive destination /u01/app/oracle/product/18.0.0/dbhome_1/dbs/arch Oldest online log sequence 2 Current log sequence 4 SQL> shut immediate Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount ORACLE instance started. Total System Global Area 1660943808 bytes Fixed Size 8658368 bytes Variable Size 1056964608 bytes Database Buffers 587202560 bytes Redo Buffers 8118272 bytes Database mounted. SQL> alter database archivelog; Database altered. SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /u01/app/oracle/product/18.0.0/dbhome_1/dbs/arch Oldest online log sequence 2 Next log sequence to archive 4 Current log sequence 4 SQL> alter database open; Database altered.
You can’t restore a table that hasn’t been backed up, even if it exists in current archive logs.
Take a full database backup
RMAN> backup database plus archivelog; Starting backup at 14-AUG-18 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=4 RECID=1 STAMP=984173730 input archived log thread=1 sequence=5 RECID=2 STAMP=984173864 input archived log thread=1 sequence=6 RECID=3 STAMP=984173913 input archived log thread=1 sequence=7 RECID=4 STAMP=984174371 input archived log thread=1 sequence=8 RECID=5 STAMP=984174523 channel ORA_DISK_1: starting piece 1 at 14-AUG-18 channel ORA_DISK_1: finished piece 1 at 14-AUG-18 piece handle=/u01/fra/PROD18C/backupset/2018_08_14/o1_mf_annnn_TAG20180814T214843_fq6073xg_.bkp tag=TAG20180814T214843 comment=NONE channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03 Finished backup at 14-AUG-18 Starting backup at 14-AUG-18 using channel ORA_DISK_1 channel ORA_DISK_1: starting full datafile backup set channel ORA_DISK_1: specifying datafile(s) in backup set input datafile file number=00001 name=/u01/app/oracle/oradata/PROD18C/system01.dbf input datafile file number=00003 name=/u01/app/oracle/oradata/PROD18C/sysaux01.dbf input datafile file number=00004 name=/u01/app/oracle/oradata/PROD18C/undotbs01.dbf input datafile file number=00007 name=/u01/app/oracle/oradata/PROD18C/users01.dbf channel ORA_DISK_1: starting piece 1 at 14-AUG-18 channel ORA_DISK_1: finished piece 1 at 14-AUG-18 piece handle=/u01/fra/PROD18C/backupset/2018_08_14/o1_mf_nnndf_TAG20180814T214847_fq60774d_.bkp tag=TAG20180814T214847 comment=NONE channel ORA_DISK_1: backup set complete, elapsed time: 00:00:45 Finished backup at 14-AUG-18 Starting backup at 14-AUG-18 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=9 RECID=6 STAMP=984174572 channel ORA_DISK_1: starting piece 1 at 14-AUG-18 channel ORA_DISK_1: finished piece 1 at 14-AUG-18 piece handle=/u01/fra/PROD18C/backupset/2018_08_14/o1_mf_annnn_TAG20180814T214932_fq608ndg_.bkp tag=TAG20180814T214932 comment=NONE channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01 Finished backup at 14-AUG-18 Starting Control File and SPFILE Autobackup at 14-AUG-18 piece handle=/u01/fra/PROD18C/autobackup/2018_08_14/o1_mf_s_984174573_fq608owz_.bkp comment=NONE Finished Control File and SPFILE Autobackup at 14-AUG-18
Step 5:- Drop the table
SQL> drop table hari.emp; Table dropped. SQL> select * from hari.emp; no rows selected.
Step 6:- Recover emp table
RMAN> recover table hari.emp until time "to_date('2018-08-14 21:53:42','yyyy-mm-dd:hh24:mi:ss')" auxiliary destination '/u01/fra'; Starting recover at 14-AUG-18 using target database control file instead of recovery catalog current log archived allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=72 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='sAyh' initialization parameters used for automatic instance: db_name=PROD18C db_unique_name=sAyh_pitr_PROD18C compatible=18.0.0 db_block_size=8192 db_files=200 diagnostic_dest=/u01/app/oracle _system_trig_enabled=FALSE sga_target=1584M processes=200 db_create_file_dest=/u01/fra log_archive_dest_1='location=/u01/fra' #No auxiliary parameter file used starting up automatic instance PROD18C Oracle instance started Total System Global Area 1660943808 bytes Fixed Size 8658368 bytes Variable Size 419430400 bytes Database Buffers 1224736768 bytes Redo Buffers 8118272 bytes Automatic instance created contents of Memory Script: { # set requested point in time set until time "to_date('2018-08-14 21:53:42','yyyy-mm-dd: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 14-AUG-18 allocated channel: ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: SID=8 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 /u01/fra/PROD18C/autobackup/2018_08_14/o1_mf_s_984174811_fq60j3or_.bkp channel ORA_AUX_DISK_1: piece handle=/u01/fra/PROD18C/autobackup/2018_08_14/o1_mf_s_984174811_fq60j3or_.bkp tag=TAG20180814T215331 channel ORA_AUX_DISK_1: restored backup piece 1 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 output file name=/u01/fra/PROD18C/controlfile/o1_mf_fq60txkl_.ctl Finished restore at 14-AUG-18 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('2018-08-14 21:53:42','yyyy-mm-dd: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 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 /u01/fra/PROD18C/datafile/o1_mf_temp_%u_.tmp in control file Starting restore at 14-AUG-18 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 /u01/fra/PROD18C/datafile/o1_mf_system_%u_.dbf channel ORA_AUX_DISK_1: restoring datafile 00004 to /u01/fra/PROD18C/datafile/o1_mf_undotbs1_%u_.dbf channel ORA_AUX_DISK_1: restoring datafile 00003 to /u01/fra/PROD18C/datafile/o1_mf_sysaux_%u_.dbf channel ORA_AUX_DISK_1: reading from backup piece /u01/fra/PROD18C/backupset/2018_08_14/o1_mf_nnndf_TAG20180814T215243_fq60gmvn_.bkp channel ORA_AUX_DISK_1: piece handle=/u01/fra/PROD18C/backupset/2018_08_14/o1_mf_nnndf_TAG20180814T215243_fq60gmvn_.bkp tag=TAG20180814T215243 channel ORA_AUX_DISK_1: restored backup piece 1 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:01:17 Finished restore at 14-AUG-18 datafile 1 switched to datafile copy input datafile copy RECID=4 STAMP=984175242 file name=/u01/fra/PROD18C/datafile/o1_mf_system_fq60v51s_.dbf datafile 4 switched to datafile copy input datafile copy RECID=5 STAMP=984175242 file name=/u01/fra/PROD18C/datafile/o1_mf_undotbs1_fq60v52y_.dbf datafile 3 switched to datafile copy input datafile copy RECID=6 STAMP=984175242 file name=/u01/fra/PROD18C/datafile/o1_mf_sysaux_fq60v52l_.dbf contents of Memory Script: { # set requested point in time set until time "to_date('2018-08-14 21:53:42','yyyy-mm-dd:hh24:mi:ss')"; # 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 14-AUG-18 using channel ORA_AUX_DISK_1 starting media recovery archived log for thread 1 with sequence 11 is already on disk as file /u01/fra/PROD18C/archivelog/2018_08_14/o1_mf_1_11_fq60j1vs_.arc archived log for thread 1 with sequence 12 is already on disk as file /u01/fra/PROD18C/archivelog/2018_08_14/o1_mf_1_12_fq60t0xc_.arc archived log file name=/u01/fra/PROD18C/archivelog/2018_08_14/o1_mf_1_11_fq60j1vs_.arc thread=1 sequence=11 archived log file name=/u01/fra/PROD18C/archivelog/2018_08_14/o1_mf_1_12_fq60t0xc_.arc thread=1 sequence=12 media recovery complete, elapsed time: 00:00:01 Finished recover at 14-AUG-18 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 = ''/u01/fra/PROD18C/controlfile/o1_mf_fq60txkl_.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 1660943808 bytes Fixed Size 8658368 bytes Variable Size 419430400 bytes Database Buffers 1224736768 bytes Redo Buffers 8118272 bytes sql statement: alter system set control_files = ''/u01/fra/PROD18C/controlfile/o1_mf_fq60txkl_.ctl'' comment= ''RMAN set'' scope=spfile Oracle instance shut down connected to auxiliary database (not started) Oracle instance started Total System Global Area 1660943808 bytes Fixed Size 8658368 bytes Variable Size 419430400 bytes Database Buffers 1224736768 bytes Redo Buffers 8118272 bytes sql statement: alter database mount clone database contents of Memory Script: { # set requested point in time set until time "to_date('2018-08-14 21:53:42','yyyy-mm-dd:hh24:mi:ss')"; # set destinations for recovery set and auxiliary set datafiles set newname for datafile 7 to new; # restore the tablespaces in the recovery set and the auxiliary set restore clone datafile 7; switch clone datafile all; } executing Memory Script executing command: SET until clause executing command: SET NEWNAME Starting restore at 14-AUG-18 allocated channel: ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: SID=34 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 00007 to /u01/fra/SAYH_PITR_PROD18C/datafile/o1_mf_users_%u_.dbf channel ORA_AUX_DISK_1: reading from backup piece /u01/fra/PROD18C/backupset/2018_08_14/o1_mf_nnndf_TAG20180814T215243_fq60gmvn_.bkp channel ORA_AUX_DISK_1: piece handle=/u01/fra/PROD18C/backupset/2018_08_14/o1_mf_nnndf_TAG20180814T215243_fq60gmvn_.bkp tag=TAG20180814T215243 channel ORA_AUX_DISK_1: restored backup piece 1 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:03 Finished restore at 14-AUG-18 datafile 7 switched to datafile copy input datafile copy RECID=8 STAMP=984175357 file name=/u01/fra/SAYH_PITR_PROD18C/datafile/o1_mf_users_fq6112n9_.dbf contents of Memory Script: { # set requested point in time set until time "to_date('2018-08-14 21:53:42','yyyy-mm-dd:hh24:mi:ss')"; # online the datafiles restored or switched sql clone "alter database datafile 7 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 7 online Starting recover at 14-AUG-18 using channel ORA_AUX_DISK_1 starting media recovery archived log for thread 1 with sequence 11 is already on disk as file /u01/fra/PROD18C/archivelog/2018_08_14/o1_mf_1_11_fq60j1vs_.arc archived log for thread 1 with sequence 12 is already on disk as file /u01/fra/PROD18C/archivelog/2018_08_14/o1_mf_1_12_fq60t0xc_.arc archived log file name=/u01/fra/PROD18C/archivelog/2018_08_14/o1_mf_1_11_fq60j1vs_.arc thread=1 sequence=11 archived log file name=/u01/fra/PROD18C/archivelog/2018_08_14/o1_mf_1_12_fq60t0xc_.arc thread=1 sequence=12 media recovery complete, elapsed time: 00:00:00 Finished recover at 14-AUG-18 database opened contents of Memory Script: { # create directory for datapump import sql "create or replace directory TSPITR_DIROBJ_DPDIR as '' /u01/fra''"; # create directory for datapump export sql clone "create or replace directory TSPITR_DIROBJ_DPDIR as '' /u01/fra''"; } executing Memory Script sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''/u01/fra'' sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''/u01/fra'' Performing export of tables... EXPDP> Starting "SYS"."TSPITR_EXP_sAyh_zwzh": EXPDP> Processing object type TABLE_EXPORT/TABLE/TABLE_DATA EXPDP> Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS EXPDP> Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER EXPDP> Processing object type TABLE_EXPORT/TABLE/TABLE EXPDP> . . exported "HARI"."EMP" 873.1 KB 100000 rows EXPDP> Master table "SYS"."TSPITR_EXP_sAyh_zwzh" successfully loaded/unloaded EXPDP> ****************************************************************************** EXPDP> Dump file set for SYS.TSPITR_EXP_sAyh_zwzh is: EXPDP> /u01/fra/tspitr_sAyh_75879.dmp EXPDP> Job "SYS"."TSPITR_EXP_sAyh_zwzh" successfully completed at Tue Aug 14 22:06:43 2018 elapsed 0 00:02:52 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_sAyh_zBwj" successfully loaded/unloaded IMPDP> Starting "SYS"."TSPITR_IMP_sAyh_zBwj": IMPDP> Processing object type TABLE_EXPORT/TABLE/TABLE IMPDP> Processing object type TABLE_EXPORT/TABLE/TABLE_DATA IMPDP> . . imported "HARI"."EMP" 873.1 KB 100000 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_sAyh_zBwj" successfully completed at Tue Aug 14 22:07:30 2018 elapsed 0 00:00:35 Import completed Removing automatic instance Automatic instance removed auxiliary instance file /u01/fra/PROD18C/datafile/o1_mf_temp_fq60xs6s_.tmp deleted auxiliary instance file /u01/fra/SAYH_PITR_PROD18C/onlinelog/o1_mf_3_fq611jxw_.log deleted auxiliary instance file /u01/fra/SAYH_PITR_PROD18C/onlinelog/o1_mf_2_fq6118dc_.log deleted auxiliary instance file /u01/fra/SAYH_PITR_PROD18C/onlinelog/o1_mf_1_fq61189k_.log deleted auxiliary instance file /u01/fra/SAYH_PITR_PROD18C/datafile/o1_mf_users_fq6112n9_.dbf deleted auxiliary instance file /u01/fra/PROD18C/datafile/o1_mf_sysaux_fq60v52l_.dbf deleted auxiliary instance file /u01/fra/PROD18C/datafile/o1_mf_undotbs1_fq60v52y_.dbf deleted auxiliary instance file /u01/fra/PROD18C/datafile/o1_mf_system_fq60v51s_.dbf deleted auxiliary instance file /u01/fra/PROD18C/controlfile/o1_mf_fq60txkl_.ctl deleted auxiliary instance file tspitr_sAyh_75879.dmp deleted Finished recover at 14-AUG-18
Step 7:- Check the table count
SQL> select count(*) from hari.emp; COUNT(*) --------- 100000
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