Concepts of recovering tables and table partitions from RMAN backups: Backups Required to Recover Tables and Table Partitions Prior to recovering a table or table partition, you must perform a full backup of undo, SYSTEM , SYSAUX , and the tablespace that contains the table or table partition. To recover tables in a PDB, you need a backup of the root’s undo, SYSTEM, and SYSAUX tablespaces along with a backup of the PDB’s SYSTEM and SYSAUX tablespaces.. If the indexes or partitions for a table in tablespace tbs1 are contained in tablespace tbs2 , then you can recover the table only if tablepsace tbs2 is also included in the recovery set. To recover a table, all partitions that contain the dependent objects of the table must be included in the recovery set. Purpose of Recovering Tables and Table Partitions from RMAN Backups RMAN enables you to recover one or more tables or table partitions to a specified point in time without affecting the remaining database objects. You can use previously-created RMAN backups to recover tables and table partitions to a specified point in time. Recovering tables and table partitions from RMAN backups is useful in the following scenarios: You need to recover a very small number of tables to a particular point in time. In this situation, TSPITR is not the most effective solution because it moves all the objects in the tablespace to a specified point in time. You need to recover tables that have been logically corrupted or have been dropped and purged. Flashback Table is not possible because the desired point-in-time is older than available undo. You want to recover data that is lost after a DDL operation modified the structure of tables. Using Flashback Table is not possible because a DDL was run on the tables between the desired point in time and the current time. Flashback Table cannot rewind tables through structural changes such as a truncate table operation. 1) Create a table as below and make a note scn number: SYS AS SYSDBA test >create table test.test1 tablespace "test" as select * from sys.obj$; Table created. SYS AS SYSDBA test >select current_scn from v$database; CURRENT_SCN ----------- 1607764 SYS AS SYSDBA test >select current_scn from v$database; CURRENT_SCN ----------- 1607792 1607941 2) Backup database: connected to target database: TESTDB (DBID=2660866528) RMAN> backup database; Starting backup at 06-OCT-16 allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=248 device type=DISK 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=/data01/oradata/test/test/system01.dbf input datafile file number=00003 name=/data01/oradata/test/test/sysaux01.dbf input datafile file number=00004 name=/data01/oradata/test/test/undotbs01.dbf input datafile file number=00005 name=/data01/oradata/test/test/test01.ORA input datafile file number=00006 name=/data01/oradata/test/test/users01.dbf channel ORA_DISK_1: starting piece 1 at 06-OCT-16 channel ORA_DISK_1: finished piece 1 at 06-OCT-16 piece handle=/data01/oradata/test/backup/TEST_01rhmagh_1_1 tag=TAG20161006T130521 comment=NONE channel ORA_DISK_1: backup set complete, elapsed time: 00:00:15 channel ORA_DISK_1: starting full 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 06-OCT-16 channel ORA_DISK_1: finished piece 1 at 06-OCT-16 piece handle=/data01/oradata/test/backup/TEST_02rhmah0_1_1 tag=TAG20161006T130521 comment=NONE channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01 Finished backup at 06-OCT-16 3) RMAN> list backup; List of Backup Sets =================== BS Key Type LV Size Device Type Elapsed Time Completion Time ------- ---- -- ---------- ----------- ------------ --------------- 1 Full 1.33G DISK 00:00:07 06-OCT-16 BP Key: 1 Status: AVAILABLE Compressed: NO Tag: TAG20161006T130521 Piece Name: /data01/oradata/test/backup/TEST_01rhmagh_1_1 List of Datafiles in backup set 1 File LV Type Ckp SCN Ckp Time Name ---- -- ---- ---------- --------- ---- 1 Full 1607936 06-OCT-16 /data01/oradata/test/test/system01.dbf 3 Full 1607936 06-OCT-16 /data01/oradata/test/test/sysaux01.dbf 4 Full 1607936 06-OCT-16 /data01/oradata/test/test/undotbs01.dbf 5 Full 1607936 06-OCT-16 /data01/oradata/test/test/test01.ORA 6 Full 1607936 06-OCT-16 /data01/oradata/test/test/users01.dbf BS Key Type LV Size Device Type Elapsed Time Completion Time ------- ---- -- ---------- ----------- ------------ --------------- 2 Full 9.64M DISK 00:00:01 06-OCT-16 BP Key: 2 Status: AVAILABLE Compressed: NO Tag: TAG20161006T130521 Piece Name: /data01/oradata/test/backup/TEST_02rhmah0_1_1 SPFILE Included: Modification time: 06-OCT-16 SPFILE db_unique_name: TEST Control File Included: Ckp SCN: 1607941 Ckp time: 06-OCT-16 4) Drop the table: SYS AS SYSDBA test >drop table test.test1; Table dropped. SYS AS SYSDBA test >exit Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options /data01/oradata/test/backup$ pwd /data01/oradata/test/backup /data01/oradata/test/backup$ ls -lrt total 1408940 -rw-r----- 1 oracle dba 1432625152 Oct 6 13:05 TEST_01rhmagh_1_1 -rw-r----- 1 oracle dba 10125312 Oct 6 13:05 TEST_02rhmah0_1_1 5) Recvoer table; /data01/oradata/test/backup$ rman target / Recovery Manager: Release 12.1.0.2.0 - Production on Thu Oct 6 13:07:22 2016 Copyright (c) 1982, 2014, Oracle and/or its affiliates. All rights reserved. connected to target database: TEST (DBID=2222672538) RMAN> recover table chalasaniv.test1 until scn 1607941 auxiliary destination '/data01/oradata/test/backup'; Starting recover at 06-OCT-16 using target database control file instead of recovery catalog current log archived allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=12 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='Dpdg' initialization parameters used for automatic instance: db_name=TEST db_unique_name=Dpdg_pitr_TEST compatible=12.1.0.2.0 db_block_size=8192 db_files=200 diagnostic_dest=/usr01/app/oracle _system_trig_enabled=FALSE sga_target=2560M processes=200 db_create_file_dest=/data01/oradata/test/backup log_archive_dest_1='location=/data01/oradata/test/backup' #No auxiliary parameter file used starting up automatic instance TEST Oracle instance started Total System Global Area 2684354560 bytes Fixed Size 2928008 bytes Variable Size 603980408 bytes Database Buffers 2063597568 bytes Redo Buffers 13848576 bytes Automatic instance created contents of Memory Script: { # set requested point in time set until scn 1607941; # 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 06-OCT-16 allocated channel: ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: SID=246 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 /data01/oradata/test/backup/TEST_02rhmah0_1_1 channel ORA_AUX_DISK_1: piece handle=/data01/oradata/test/backup/TEST_02rhmah0_1_1 tag=TAG20161006T130521 channel ORA_AUX_DISK_1: restored backup piece 1 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 output file name=/data01/oradata/test/backup/TEST/controlfile/o1_mf_czf175dj_.ctl Finished restore at 06-OCT-16 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 1607941; # 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 /data01/oradata/test/backup/TEST/datafile/o1_mf_temp_%u_.tmp in control file Starting restore at 06-OCT-16 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 /data01/oradata/test/backup/TEST/datafile/o1_mf_system_%u_.dbf channel ORA_AUX_DISK_1: restoring datafile 00004 to /data01/oradata/test/backup/TEST/datafile/o1_mf_undotbs1_%u_.dbf channel ORA_AUX_DISK_1: restoring datafile 00003 to /data01/oradata/test/backup/TEST/datafile/o1_mf_sysaux_%u_.dbf channel ORA_AUX_DISK_1: reading from backup piece /data01/oradata/test/backup/TEST_01rhmagh_1_1 channel ORA_AUX_DISK_1: piece handle=/data01/oradata/test/backup/TEST_01rhmagh_1_1 tag=TAG20161006T130521 channel ORA_AUX_DISK_1: restored backup piece 1 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:15 Finished restore at 06-OCT-16 datafile 1 switched to datafile copy input datafile copy RECID=4 STAMP=924527290 file name=/data01/oradata/test/backup/TEST/datafile/o1_mf_system_czf17cdq_.dbf datafile 4 switched to datafile copy input datafile copy RECID=5 STAMP=924527290 file name=/data01/oradata/test/backup/TEST/datafile/o1_mf_undotbs1_czf17cf8_.dbf datafile 3 switched to datafile copy input datafile copy RECID=6 STAMP=924527290 file name=/data01/oradata/test/backup/TEST/datafile/o1_mf_sysaux_czf17cf0_.dbf contents of Memory Script: { # set requested point in time set until scn 1607941; # 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 06-OCT-16 using channel ORA_AUX_DISK_1 starting media recovery archived log for thread 1 with sequence 13 is already on disk as file /log01/oradata/test/arch/1_13_924526107.dbf archived log file name=/log01/oradata/test/arch/1_13_924526107.dbf thread=1 sequence=13 media recovery complete, elapsed time: 00:00:00 Finished recover at 06-OCT-16 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 = ''/data01/oradata/test/backup/TEST/controlfile/o1_mf_czf175dj_.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 2684354560 bytes Fixed Size 2928008 bytes Variable Size 603980408 bytes Database Buffers 2063597568 bytes Redo Buffers 13848576 bytes sql statement: alter system set control_files = ''/data01/oradata/test/backup/TEST/controlfile/o1_mf_czf175dj_.ctl'' comment= ''RMAN set'' scope=spfile Oracle instance shut down connected to auxiliary database (not started) Oracle instance started Total System Global Area 2684354560 bytes Fixed Size 2928008 bytes Variable Size 603980408 bytes Database Buffers 2063597568 bytes Redo Buffers 13848576 bytes sql statement: alter database mount clone database contents of Memory Script: { # set requested point in time set until scn 1607941; # set destinations for recovery set and auxiliary set datafiles set newname for datafile 5 to new; # restore the tablespaces in the recovery set and the auxiliary set restore clone datafile 5; switch clone datafile all; } executing Memory Script executing command: SET until clause executing command: SET NEWNAME Starting restore at 06-OCT-16 allocated channel: ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: SID=6 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 00005 to /data01/oradata/test/backup/DPDG_PITR_TEST/datafile/o1_mf_test_%u_.dbf channel ORA_AUX_DISK_1: reading from backup piece /data01/oradata/test/backup/TEST_01rhmagh_1_1 channel ORA_AUX_DISK_1: piece handle=/data01/oradata/test/backup/TEST_01rhmagh_1_1 tag=TAG20161006T130521 channel ORA_AUX_DISK_1: restored backup piece 1 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 Finished restore at 06-OCT-16 datafile 5 switched to datafile copy input datafile copy RECID=8 STAMP=924527341 file name=/data01/oradata/test/backup/DPDG_PITR_TEST/datafile/o1_mf_test_czf19dn0_.dbf contents of Memory Script: { # set requested point in time set until scn 1607941; # online the datafiles restored or switched sql clone "alter database datafile 5 online"; # recover and open resetlogs recover clone database tablespace "test", "SYSTEM", "UNDOTBS1", "SYSAUX" delete archivelog; alter clone database open resetlogs; } executing Memory Script executing command: SET until clause sql statement: alter database datafile 5 online Starting recover at 06-OCT-16 using channel ORA_AUX_DISK_1 starting media recovery archived log for thread 1 with sequence 13 is already on disk as file /log01/oradata/test/arch/1_13_924526107.dbf archived log file name=/log01/oradata/test/arch/1_13_924526107.dbf thread=1 sequence=13 media recovery complete, elapsed time: 00:00:00 Finished recover at 06-OCT-16 database opened contents of Memory Script: { # create directory for datapump import sql "create or replace directory TSPITR_DIROBJ_DPDIR as '' /data01/oradata/test/backup''"; # create directory for datapump export sql clone "create or replace directory TSPITR_DIROBJ_DPDIR as '' /data01/oradata/test/backup''"; } executing Memory Script sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''/data01/oradata/test/backup'' sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''/data01/oradata/test/backup'' Performing export of tables... EXPDP> Starting "SYS"."TSPITR_EXP_Dpdg_gbqu": EXPDP> Estimate in progress using BLOCKS method... EXPDP> Processing object type TABLE_EXPORT/TABLE/TABLE_DATA EXPDP> Total estimation using BLOCKS method: 12 MB 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 "CHALASANIV"."TEST1" 9.638 MB 91516 rows EXPDP> Master table "SYS"."TSPITR_EXP_Dpdg_gbqu" successfully loaded/unloaded EXPDP> ****************************************************************************** EXPDP> Dump file set for SYS.TSPITR_EXP_Dpdg_gbqu is: EXPDP> /data01/oradata/test/backup/tspitr_Dpdg_36937.dmp EXPDP> Job "SYS"."TSPITR_EXP_Dpdg_gbqu" successfully completed at Thu Oct 6 13:09:21 2016 elapsed 0 00:00:12 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_Dpdg_bqxl" successfully loaded/unloaded IMPDP> Starting "SYS"."TSPITR_IMP_Dpdg_bqxl": IMPDP> Processing object type TABLE_EXPORT/TABLE/TABLE IMPDP> Processing object type TABLE_EXPORT/TABLE/TABLE_DATA IMPDP> . . imported "CHALASANIV"."TEST1" 9.638 MB 91516 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_Dpdg_bqxl" successfully completed at Thu Oct 6 13:09:29 2016 elapsed 0 00:00:02 Import completed Removing automatic instance Automatic instance removed auxiliary instance file /data01/oradata/test/backup/TEST/datafile/o1_mf_temp_czf17w5l_.tmp deleted auxiliary instance file /data01/oradata/test/backup/DPDG_PITR_TEST/onlinelog/o1_mf_3_czf19glv_.log deleted auxiliary instance file /data01/oradata/test/backup/DPDG_PITR_TEST/onlinelog/o1_mf_2_czf19ggr_.log deleted auxiliary instance file /data01/oradata/test/backup/DPDG_PITR_TEST/onlinelog/o1_mf_1_czf19gbp_.log deleted auxiliary instance file /data01/oradata/test/backup/DPDG_PITR_TEST/datafile/o1_mf_test_czf19dn0_.dbf deleted auxiliary instance file /data01/oradata/test/backup/TEST/datafile/o1_mf_sysaux_czf17cf0_.dbf deleted auxiliary instance file /data01/oradata/test/backup/TEST/datafile/o1_mf_undotbs1_czf17cf8_.dbf deleted auxiliary instance file /data01/oradata/test/backup/TEST/datafile/o1_mf_system_czf17cdq_.dbf deleted auxiliary instance file /data01/oradata/test/backup/TEST/controlfile/o1_mf_czf175dj_.ctl deleted auxiliary instance file tspitr_Dpdg_36937.dmp deleted Finished recover at 06-OCT-16 RMAN> exit
↧