RMAN

Tablespace point in time recovery (TSPITR)

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Details: Parent Category: Articles; Created on Tuesday, 19 July 2011 14:52; Last Updated on Tuesday, 24 July 2012 10:00; Published on Tuesday, 19 July 2011 14:52; Hits: 5532

Tablespace point in time recovery (TSPITR) all in 1.

With the below example we show what tablespace point in time recovery (TSPITR) can do for you and how easy it is.
We demonstrate this with the following scenario ( done with release 11.2.0.2 )

1) at t0 a schema owner stores his/her segment in a dedicated tablespace.( in this example test_tspitr )
2) at t1 (and every x days) there is a full hot database backup including that tablespace ( database operates in archivelog mode )
3) at t2 a logical error happens, other business data in other tablespaces is not impacted and for the business the database can' t be shutdown, "only" the content of the tablespace must be reset
4) at t3 the TSPITR in launched, an auxiliary instance is automatically created with only the required tablespaces (to restore), the content of the tablespace is exported and automatically imported in the original production database which was never been stopped.

1) (t0) Setup test scenario, tablesPace test_tspitr and schema owner

SQL> create tablespace test_tspitr datafile '/opt/oradata/SILVER/test_tspits.dbf' size 100M extent management local segment space management auto; Tablespace created. SQL> create user tspitr identified by tspitr default tablespace test_tspitr temporary tablespace temp; User created. SQL> grant create session, create table to tspitr; Grant succeeded. SQL> alter user tspitr quota unlimited on test_tspitr; User altered. SQL> grant create session, create table to tspitr; Grant succeeded. SQL> alter user tspitr quota unlimited on test_tspitr; User altered. SQL> connect tspitr/tspitr; Connected. SQL> create table T1 (col1 number); Table created. SQL> begin 2 for i in 1 .. 100 loop 3 insert into t1 values (i); 4 end loop; 5 end; 6 / PL/SQL procedure successfully completed. SQL> select table_name,tablespace_name from user_tables; TABLE_NAME TABLESPACE_NAME ------------------------------ ------------------------------ T1 TEST_TSPITR

2) (t1) Full hot database backup are scheduled at regular time interval ( database operates in archivelog mode ).

RMAN> list backup of tablespace test_tspitr; List of Backup Sets =================== BS Key Type LV Size Device Type Elapsed Time Completion Time ------- ---- -- ---------- ----------- ------------ --------------- 118 Full 164.78M DISK 00:01:04 19-JUL-11 BP Key: 118 Status: AVAILABLE Compressed: YES Tag: TAG20110719T110604 Piece Name: /opt/flash_recovery_area/backup/SILVER/DB_SILVER_48mhqs2k_1_1 List of Datafiles in backup set 118 File LV Type Ckp SCN Ckp Time Name ---- -- ---- ---------- --------- ---- 5 Full 10927492 19-JUL-11 /opt/oradata/SILVER/test_tspits.dbf

3) (t2) a logical error happens

SQL> truncate table t1;

Table truncated.

4a) (t3) with logminer we find out what happens and at which SCN

SQL> begin 2 dbms_logmnr.add_logfile(logfilename=> '/opt/flash_recovery_area/SILVER/archivelog/2011_07_19/o1_mf_1_237_72bmh7l4_.arc'); 3 end; 4 / PL/SQL procedure successfully completed. SQL> begin 2 dbms_logmnr.start_logmnr(); 3 end; 4 / PL/SQL procedure successfully completed. SQL> select scn,start_scn,commit_scn,sql_redo,sql_undo from v$logmnr_contents where seg_owner='TSPITR' and seg_name='T1'; SCN START_SCN COMMIT_SCN ---------- ---------- ---------- SQL_REDO -------------------------------------------------------------------------------- SQL_UNDO -------------------------------------------------------------------------------- 10939574 truncate table t1;

4b) (t3) with RMAN we launch the TSPITR, note what happens automatically for us.

[oracle@pcguy ~]$ rman target / Recovery Manager: Release 11.2.0.2.0 - Production on Tue Jul 19 11:52:31 2011 Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved. connected to target database: SILVER (DBID=2121303953) RMAN> recover tablespace test_tspitr 2> until scn 10939570 3> auxiliary destination '/opt/oradata/TSPITR'; Starting recover at 19-JUL-11 using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=15 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='tkjg' initialization parameters used for automatic instance: db_name=SILVER db_unique_name=tkjg_tspitr_SILVER compatible=11.2.0.0.0 db_block_size=8192 db_files=200 sga_target=280M processes=50 db_create_file_dest=/opt/oradata/TSPITR log_archive_dest_1='location=/opt/oradata/TSPITR' #No auxiliary parameter file used starting up automatic instance SILVER Oracle instance started Total System Global Area 292278272 bytes Fixed Size 2225872 bytes Variable Size 100665648 bytes Database Buffers 184549376 bytes Redo Buffers 4837376 bytes Automatic instance created Running TRANSPORT_SET_CHECK on recovery set tablespaces TRANSPORT_SET_CHECK completed successfully contents of Memory Script: { # set requested point in time set until scn 10939570; # 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'; # avoid unnecessary autobackups for structural changes during TSPITR sql 'begin dbms_backup_restore.AutoBackupFlag(FALSE); end;'; } executing Memory Script executing command: SET until clause Starting restore at 19-JUL-11 allocated channel: ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: SID=59 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 /opt/flash_recovery_area/backup/SILVER/CT_SILVER_4cmhqs7f_1_1 channel ORA_AUX_DISK_1: piece handle=/opt/flash_recovery_area/backup/SILVER/CT_SILVER_4cmhqs7f_1_1 tag=TAG20110719T110935 channel ORA_AUX_DISK_1: restored backup piece 1 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 output file name=/opt/oradata/TSPITR/SILVER/controlfile/o1_mf_72boflgb_.ctl Finished restore at 19-JUL-11 sql statement: alter database mount clone database sql statement: alter system archive log current sql statement: begin dbms_backup_restore.AutoBackupFlag(FALSE); end; contents of Memory Script: { # set requested point in time set until scn 10939570; plsql <<<-- tspitr_2 declare sqlstatement varchar2(512); offline_not_needed exception; pragma exception_init(offline_not_needed, -01539); begin sqlstatement := 'alter tablespace '|| 'TEST_TSPITR' ||' offline immediate'; krmicd.writeMsg(6162, sqlstatement); krmicd.execSql(sqlstatement); exception when offline_not_needed then null; end; >>>; # set destinations for recovery set and auxiliary set datafiles set newname for clone datafile 1 to new; set newname for clone datafile 3 to new; set newname for clone datafile 2 to new; set newname for clone tempfile 1 to new; set newname for datafile 5 to "/opt/oradata/SILVER/test_tspits.dbf"; # switch all tempfiles switch clone tempfile all; # restore the tablespaces in the recovery set and the auxiliary set restore clone datafile 1, 3, 2, 5; switch clone datafile all; } executing Memory Script executing command: SET until clause sql statement: alter tablespace TEST_TSPITR offline immediate executing command: SET NEWNAME executing command: SET NEWNAME executing command: SET NEWNAME executing command: SET NEWNAME executing command: SET NEWNAME renamed tempfile 1 to /opt/oradata/TSPITR/SILVER/datafile/o1_mf_temp_%u_.tmp in control file Starting restore at 19-JUL-11 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 00003 to /opt/oradata/TSPITR/SILVER/datafile/o1_mf_undotbs1_%u_.dbf channel ORA_AUX_DISK_1: restoring datafile 00002 to /opt/oradata/TSPITR/SILVER/datafile/o1_mf_sysaux_%u_.dbf channel ORA_AUX_DISK_1: reading from backup piece /opt/flash_recovery_area/backup/SILVER/DB_SILVER_47mhqs0s_1_1 channel ORA_AUX_DISK_1: piece handle=/opt/flash_recovery_area/backup/SILVER/DB_SILVER_47mhqs0s_1_1 tag=TAG20110719T110604 channel ORA_AUX_DISK_1: restored backup piece 1 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:01:05 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 /opt/oradata/TSPITR/SILVER/datafile/o1_mf_system_%u_.dbf channel ORA_AUX_DISK_1: restoring datafile 00005 to /opt/oradata/SILVER/test_tspits.dbf channel ORA_AUX_DISK_1: reading from backup piece /opt/flash_recovery_area/backup/SILVER/DB_SILVER_48mhqs2k_1_1 channel ORA_AUX_DISK_1: piece handle=/opt/flash_recovery_area/backup/SILVER/DB_SILVER_48mhqs2k_1_1 tag=TAG20110719T110604 channel ORA_AUX_DISK_1: restored backup piece 1 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:56 Finished restore at 19-JUL-11 datafile 1 switched to datafile copy input datafile copy RECID=5 STAMP=756907345 file name=/opt/oradata/TSPITR/SILVER/datafile/o1_mf_system_72boht3s_.dbf datafile 3 switched to datafile copy input datafile copy RECID=6 STAMP=756907345 file name=/opt/oradata/TSPITR/SILVER/datafile/o1_mf_undotbs1_72bofs0y_.dbf datafile 2 switched to datafile copy input datafile copy RECID=7 STAMP=756907345 file name=/opt/oradata/TSPITR/SILVER/datafile/o1_mf_sysaux_72bofry3_.dbf contents of Memory Script: { # set requested point in time set until scn 10939570; # online the datafiles restored or switched sql clone "alter database datafile 1 online"; sql clone "alter database datafile 3 online"; sql clone "alter database datafile 2 online"; sql clone "alter database datafile 5 online"; # recover and open resetlogs recover clone database tablespace "TEST_TSPITR", "SYSTEM", "UNDOTBS1", "SYSAUX" delete archivelog; alter clone database open resetlogs; } executing Memory Script executing command: SET until clause sql statement: alter database datafile 1 online sql statement: alter database datafile 3 online sql statement: alter database datafile 2 online sql statement: alter database datafile 5 online Starting recover at 19-JUL-11 using channel ORA_AUX_DISK_1 starting media recovery archived log for thread 1 with sequence 237 is already on disk as file /opt/flash_recovery_area/SILVER/archivelog/2011_07_19/o1_mf_1_237_72bmh7l4_.arc 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=236 channel ORA_AUX_DISK_1: reading from backup piece /opt/flash_recovery_area/backup/SILVER/AL_SILVER_4bmhqs7d_1_1 channel ORA_AUX_DISK_1: piece handle=/opt/flash_recovery_area/backup/SILVER/AL_SILVER_4bmhqs7d_1_1 tag=TAG20110719T110933 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=/opt/oradata/TSPITR/1_236_751381589.dbf thread=1 sequence=236 channel clone_default: deleting archived log(s) archived log file name=/opt/oradata/TSPITR/1_236_751381589.dbf RECID=319 STAMP=756907347 archived log file name=/opt/flash_recovery_area/SILVER/archivelog/2011_07_19/o1_mf_1_237_72bmh7l4_.arc thread=1 sequence=237 media recovery complete, elapsed time: 00:00:08 Finished recover at 19-JUL-11 database opened contents of Memory Script: { # make read only the tablespace that will be exported sql clone 'alter tablespace TEST_TSPITR read only'; # create directory for datapump import sql "create or replace directory TSPITR_DIROBJ_DPDIR as '' /opt/oradata/TSPITR''"; # create directory for datapump export sql clone "create or replace directory TSPITR_DIROBJ_DPDIR as '' /opt/oradata/TSPITR''"; } executing Memory Script sql statement: alter tablespace TEST_TSPITR read only sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''/opt/oradata/TSPITR'' sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''/opt/oradata/TSPITR'' Performing export of metadata... EXPDP> Starting "SYS"."TSPITR_EXP_tkjg": EXPDP> Processing object type TRANSPORTABLE_EXPORT/PLUGTS_BLK EXPDP> Processing object type TRANSPORTABLE_EXPORT/TABLE EXPDP> Processing object type TRANSPORTABLE_EXPORT/POST_INSTANCE/PLUGTS_BLK EXPDP> Master table "SYS"."TSPITR_EXP_tkjg" successfully loaded/unloaded EXPDP> ****************************************************************************** EXPDP> Dump file set for SYS.TSPITR_EXP_tkjg is: EXPDP> /opt/oradata/TSPITR/tspitr_tkjg_32318.dmp EXPDP> ****************************************************************************** EXPDP> Datafiles required for transportable tablespace TEST_TSPITR: EXPDP> /opt/oradata/SILVER/test_tspits.dbf EXPDP> Job "SYS"."TSPITR_EXP_tkjg" successfully completed at 12:04:01 Export completed contents of Memory Script: { # shutdown clone before import shutdown clone immediate # drop target tablespaces before importing them back sql 'drop tablespace TEST_TSPITR including contents keep datafiles'; } executing Memory Script database closed database dismounted Oracle instance shut down sql statement: drop tablespace TEST_TSPITR including contents keep datafiles Performing import of metadata... IMPDP> Master table "SYS"."TSPITR_IMP_tkjg" successfully loaded/unloaded IMPDP> Starting "SYS"."TSPITR_IMP_tkjg": IMPDP> Processing object type TRANSPORTABLE_EXPORT/PLUGTS_BLK IMPDP> Processing object type TRANSPORTABLE_EXPORT/TABLE IMPDP> Processing object type TRANSPORTABLE_EXPORT/POST_INSTANCE/PLUGTS_BLK IMPDP> Job "SYS"."TSPITR_IMP_tkjg" successfully completed at 12:04:23 Import completed contents of Memory Script: { # make read write and offline the imported tablespaces sql 'alter tablespace TEST_TSPITR read write'; sql 'alter tablespace TEST_TSPITR offline'; # enable autobackups after TSPITR is finished sql 'begin dbms_backup_restore.AutoBackupFlag(TRUE); end;'; } executing Memory Script sql statement: alter tablespace TEST_TSPITR read write sql statement: alter tablespace TEST_TSPITR offline sql statement: begin dbms_backup_restore.AutoBackupFlag(TRUE); end; Removing automatic instance Automatic instance removed auxiliary instance file /opt/oradata/TSPITR/SILVER/datafile/o1_mf_temp_72bol2pk_.tmp deleted auxiliary instance file /opt/oradata/TSPITR/SILVER/onlinelog/o1_mf_3_72bol0gf_.log deleted auxiliary instance file /opt/oradata/TSPITR/SILVER/onlinelog/o1_mf_2_72bokz76_.log deleted auxiliary instance file /opt/oradata/TSPITR/SILVER/onlinelog/o1_mf_1_72bokxh1_.log deleted auxiliary instance file /opt/oradata/TSPITR/SILVER/datafile/o1_mf_sysaux_72bofry3_.dbf deleted auxiliary instance file /opt/oradata/TSPITR/SILVER/datafile/o1_mf_undotbs1_72bofs0y_.dbf deleted auxiliary instance file /opt/oradata/TSPITR/SILVER/datafile/o1_mf_system_72boht3s_.dbf deleted auxiliary instance file /opt/oradata/TSPITR/SILVER/controlfile/o1_mf_72boflgb_.ctl deleted Finished recover at 19-JUL-11

5) (t4) We test whether the contents of the table t1 has been restored

[oracle@pcguy oradata]$ sqlplus tspitr/tspitr SQL*Plus: Release 11.2.0.2.0 Production on Tue Jul 19 12:21:57 2011 Copyright (c) 1982, 2010, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> select count(*) from t1; select count(*) from t1 * ERROR at line 1: ORA-00376: file 5 cannot be read at this time ORA-01110: data file 5: '/opt/oradata/SILVER/test_tspits.dbf' SQL> connect / as sysdba Connected. SQL> alter tablespace test_tspitr online; Tablespace altered. SQL> connect tspitr/tspitr Connected. SQL> select count(*) from t1; COUNT(*) ---------- 100