Complete Recovery With User-managed Backup with ExamplesBACKUP
AND RECOVERY SCENARIOSComplete Recovery With User-managed Backup.
User Managed Recovery Scenarios of complete recovery. 1. Complete
Closed Database Recovery. System datafile is missing(with recent
backups) 2. Complete Open Database Recovery. Non system datafile is
missing(with backups). 3. Complete Open Database Recovery (when the
database is initially closed). Non system datafile is missing(with
backups) 4. Recovery of a Missing Datafile that has no
backups.(Disk corrupted and no backups available) restriction:
datafile should be created after controlfile
creation.(i.e,controlfile creation time is prior than datafile
creation time).you cannot recover or create datafile without backup
in the following situation: view plainprint?SQL> select
CONTROLFILE_CREATED from v$database; CONTROLFILE_CREATED
-------------------- 07-MAY-2010 01:23:43 view plainprint?SQL>
select creation_time,name from v$datafile; CREATION_TIME NAME
-------------------- ---------------------------------------------
30-JUN-2005 19:10:11 /u01/app/oracle/oradata/testdb/system01.dbf
30-JUN-2005 19:55:01 /u01/app/oracle/oradata/testdb/undotbs01.dbf
30-JUN-2005 19:10:27 /u01/app/oracle/oradata/testdb/sysaux01.dbf
30-JUN-2005 19:10:40 /u01/app/oracle/oradata/testdb/users01.dbf
5. Restore and Recovery of a Datafile to a different
location.(Disk corrupted having recent backup and recover the
datafile in new Disk location).
User Managed Recovery Scenarios User managed recovery scenarios
do require that the database is in archive log mode, and that
backups of all datafiles and control files are made with the
tablespaces set to begin backup, if the database is open while the
copy is made. At the end of the copy of each tablespace it is
necessaire to take it out of backup mode. Alternatively complete
backups can be made with the database shutdown. Online redologs can
be optionally backed up. Files to be copied: select name from
v$datafile; select member from v$logfile; # optional select name
from v$controlfile;1.Complete Closed Database Recovery. System
tablespace is missing If the system tablespace is missing or
corrupted the database cannot be started up so a complete closed
database recovery must be performed. Pre requisites: A closed or
open database backup and archived logs. 1. Use OS commands to
restore the missing or corrupted system datafile to its original
location from recent backup, ie: cp -p
/user/backup/uman/system01.dbf /user/oradata/u01/dbtst/system01.dbf
2. startup mount; 3. recover datafile 1; 4. alter database
open;workshop1: system datafile recovery with recent backup
view plainprint?SQL> create user rajesh identified by rajesh;
User created. SQL> grant dba to rajesh; Grant succeeded. SQL>
shutdown immediate Database closed. Database dismounted. ORACLE
instance shut down. i manually deleted the datafile system01.dbf
for testing purpose only SQL> startup ORACLE instance started.
Total System Global Area 444596224 bytes Fixed Size 1219904 bytes
Variable Size 138412736 bytes Database Buffers 301989888 bytes Redo
Buffers 2973696 bytes Database mounted. ORA-01157: cannot
identify/lock data file 1 - see DBWR trace file ORA-01110: data
file 1: '/u01/app/oracle/oradata/testdb/system01.dbf' SQL>
shutdown immediate ORA-01109: database not open Database
dismounted. ORACLE instance shut down. SQL> host cp
/u01/app/oracle/oradata/backup/system01.dbf
/u01/app/oracle/oradata/testdb/system01.dbf system datafile
restored from recent backup SQL*Plus: Release 10.2.0.1.0 -
Production on Fri May 7 12:51:16 2010 Copyright (c) 1982, 2005,
Oracle. All rights reserved. Enter user-name: sys as sysdba Enter
password: Connected to an idle instance. SQL> startup mount
ORACLE instance started. Total System Global Area 444596224 bytes
Fixed Size 1219904 bytes Variable Size 138412736 bytes Database
Buffers 301989888 bytes Redo Buffers 2973696 bytes Database
mounted. SQL> recover datafile 1; ORA-00279: change 454383
generated at 05/07/2010 01:40:11 needed for thread 1 ORA-00289:
suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_7_%u_.arc
ORA-00280: change 454383 for thread 1 is in sequence #7 Specify
log: {=suggested | filename | AUTO | CANCEL} auto ORA-00279: change
456007 generated at 05/07/2010 12:46:10 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_8_%u_.arc
ORA-00280: change 456007 for thread 1 is in sequence #8 ORA-00278:
log file
'/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_7_5y7hkty0_.arc'
no longer needed for this recovery . . . ORA-00279: change 456039
generated at 05/07/2010 12:46:22 needed for thread 1 ORA-00289:
suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_11_%u_.arc
ORA-00280: change 456039 for thread 1 is in sequence #11 ORA-00278:
log file
'/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_10_5y7hl7dr_.arc'
no longer needed for this recovery Log applied. Media recovery
complete. SQL> alter database open; Database altered. SQL>
archive log list; Database log mode Archive Mode Automatic archival
Enabled Archive destination USE_DB_RECOVERY_FILE_DEST Oldest online
log sequence 12 Next log sequence to archive 14 Current log
sequence 14 SQL> select username from dba_users 2 where
username='RAJESH'; USERNAME ------------------------------
RAJESH
2.Complete Open Database Recovery. Non system tablespace is
missing If a non system tablespace is missing or corrupted while
the database is open, recovery can be performed while the database
remain open. Pre requisites: A closed or open database backup and
archived logs. 1. Use OS commands to restore the missing or
corrupted datafile to its original location, ie: cp -p
/user/backup/uman/user01.dbf /user/oradata/u01/dbtst/user01.dbf
2. alter tablespace offline immediate; 3. recover tablespace ;
4. alter tablespace online;
workshop2: Non-system datafile recovery from recent backup when
database is open view plainprint?SQL> ALTER USER rajesh DEFAULT
TABLESPACE users; User altered. SQL> conn rajesh/rajesh;
Connected. SQL> create table demo(id number); Table created.
SQL> insert into demo values(123); 1 row created. SQL>
commit; Commit complete. SQL> select * from demo; ID ----------
123 SQL> conn sys/oracle as sysdba; Connected. SQL> alter
system switch logfile; System altered. SQL> / System altered.
SQL> archive log list; Database log mode Archive Mode Automatic
archival Enabled Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 14 Next log sequence to archive 16
Current log sequence 16 i manually deleted the datafile users01.dbf
for testing purpose only SQL> conn rajesh/rajesh; Connected.
SQL> alter system flush buffer_cache; System altered. SQL>
select * from demo; select * from demo * ERROR at line 1:
ORA-00376: file 4 cannot be read at this time ORA-01110: data file
4: '/u01/app/oracle/oradata/testdb/users01.dbf' SQL> conn
sys/oracle as sysdba; Connected. SQL> host cp -p
/u01/app/oracle/oradata/backup/users01.dbf
/u01/app/oracle/oradata/testdb/users01.dbf restore the users01.dbf
datafile from recent backup to the testdb folder SQL> alter
tablespace users offline immediate; Tablespace altered. SQL>
recover tablespace users; ORA-00279: change 454383 generated at
05/07/2010 01:40:11 needed for thread 1 ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_7_%u_.arc
ORA-00280: change 454383 for thread 1 is in sequence #7 Specify
log: {=suggested | filename | AUTO | CANCEL} auto ORA-00279: change
456007 generated at 05/07/2010 12:46:10 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_8_%u_.arc
ORA-00280: change 456007 for thread 1 is in sequence #8 ORA-00278:
log file
'/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_7_5y7hkty0_.arc'
no longer needed for this recovery ..... ...... ORA-00279: change
456044 generated at 05/07/2010 12:46:28 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_13_%u_.arc
ORA-00280: change 456044 for thread 1 is in sequence #13 ORA-00278:
log file
'/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_12_5y7hldl2_.arc'
no longer needed for this recovery Log applied. Media recovery
complete. SQL> alter tablespace users online; Tablespace
altered. SQL> conn rajesh/rajesh; Connected. SQL> select *
from demo; ID ---------- 123 3.Complete Open Database Recovery
(when the database is initially closed).Non system datafile is
missing If a non system tablespace is missing or corrupted and the
database crashed, recovery can be performed after the database is
open. Pre requisites: A closed or open database backup and archived
logs. 1. startup; (you will get ora-1157 ora-1110 and the name of
the missing datafile, the database will remain mounted) 2. alter
database datafile3 offline; (tablespace cannot be used because the
database is not open) 3. alter database open; 4. Use OS commands to
restore the missing or corrupted datafile to its original location,
ie: cp -p /user/backup/uman/user01.dbf
/user/oradata/u01/dbtst/user01.dbf 5. recover datafile 3; 6. alter
tablespace online;workshop 3:Non system datafile is missing
view plainprint?SQL> conn sys/oracle as sysdba; Connected.
SQL> alter system switch logfile; System altered. SQL> select
username,default_tablespace from dba_users 2 where
username='RAJESH'; USERNAME DEFAULT_TABLESPACE
------------------------------ ------------------------------
RAJESH USERS SQL> conn rajesh/rajesh; Connected. SQL> create
table testtbl (id number); Table created. SQL> insert into
testtbl values(786); 1 row created. SQL> commit; Commit
complete. SQL> select * from testtbl; ID ---------- 786 SQL>
conn sys/oracle as sysdba; Connected. SQL> shutdown immediate;
Database closed. Database dismounted. ORACLE instance shut down.
SQL> --manually deleting the users01.dbf datafile from testdb
folder warning:for testing purpose only SQL> host rm -rf
/u01/app/oracle/oradata/testdb/users01.dbf SQL> startup ORACLE
instance started. Total System Global Area 444596224 bytes Fixed
Size 1219904 bytes Variable Size 142607040 bytes Database Buffers
297795584 bytes Redo Buffers 2973696 bytes Database mounted.
ORA-01157: cannot identify/lock data file 4 - see DBWR trace file
ORA-01110: data file 4:
'/u01/app/oracle/oradata/testdb/users01.dbf' SQL> alter database
datafile 4 offline; Database altered. SQL> alter database open;
Database altered. SQL> host cp -p
/u01/app/oracle/oradata/backup/users01.dbf
/u01/app/oracle/oradata/testdb/users01.dbf copying user01.dbf from
the recent backup to the testdb folder SQL> recover datafile 4;
ORA-00279: change 454383 generated at 05/07/2010 01:40:11 needed
for thread 1 ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_7_%u_.arc
ORA-00280: change 454383 for thread 1 is in sequence #7 Specify
log: { =suggested | filename | AUTO | CANCEL} auto ORA-00279:
change 456007 generated at 05/07/2010 12:46:10 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_8_%u_.arc
ORA-00280: change 456007 for thread 1 is in sequence #8 ORA-00278:
log file
'/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_7_5y7hkty0_.arc'
no longer needed for this recovery ...... ......... ORA-00279:
change 456046 generated at 05/07/2010 12:46:29 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_14_%u_.arc
ORA-00280: change 456046 for thread 1 is in sequence #14 ORA-00278:
log file
'/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_13_5y7hlfbc_.arc'
no longer needed for this recovery Log applied. Media recovery
complete. SQL> alter database datafile 4 online; Database
altered. SQL> conn rajesh/rajesh; Connected. SQL> select *
from testtbl; ID ---------- 786 4.Recovery of a Missing Datafile
that has no backups (database is open). If a non system datafile
that was not backed up since the last backup is missing,
recovery can be performed if all archived logs since the
creation of the missing datafile exist. Pre requisites: All
relevant archived logs. 1. alter tablespace offline immediate; 2.
alter database create datafile
'/user/oradata/u01/dbtst/newdata01.dbf'; 3. recover tablespace ; 4.
alter tablespace online;
If the create datafile command needs to be executed to place the
datafile on a location different than the original use: alter
database create datafile '/user/oradata/u01/dbtst/newdata01.dbf' as
'/user/oradata/u02/dbtst/newdata01.dbf'
restriction: datafile should be created after controlfile
creation.(i.e,controlfile creation time is prior than datafile
creation time).workshop 4: Missing Non-system Datafile having no
backups view plainprint?SQL> alter session set
nls_date_format='DD-MON-YYYY hh24:mi:ss'; Session altered. SQL>
select controlfile_created from v$database; CONTROLFILE_CREATED
-------------------- 07-MAY-2010 16:27:22 SQL> col name format
a45 SQL> select creation_time,name from v$datafile;
CREATION_TIME NAME --------------------
--------------------------------------------- 30-JUN-2005 19:10:11
/u01/app/oracle/oradata/testdb/system01.dbf 30-JUN-2005 19:55:01
/u01/app/oracle/oradata/testdb/undotbs01.dbf 30-JUN-2005 19:10:27
/u01/app/oracle/oradata/testdb/sysaux01.dbf 30-JUN-2005 19:10:40
/u01/app/oracle/oradata/testdb/users01.dbf you cannot re-create the
any one of the listed above datafile , without backup. SQL>
create tablespace testing datafile 2
'/u01/app/oracle/oradata/testdb/test01.dbf' size 2m; Tablespace
created. SQL> select creation_time,name from v$datafile;
CREATION_TIME NAME --------------------
--------------------------------------------- 30-JUN-2005 19:10:11
/u01/app/oracle/oradata/testdb/system01.dbf 30-JUN-2005 19:55:01
/u01/app/oracle/oradata/testdb/undotbs01.dbf 30-JUN-2005 19:10:27
/u01/app/oracle/oradata/testdb/sysaux01.dbf 30-JUN-2005 19:10:40
/u01/app/oracle/oradata/testdb/users01.dbf 07-MAY-2010 16:32:07
/u01/app/oracle/oradata/testdb/test01.dbf we can re-create
test01.dbf file without backup. SQL> select controlfile_created
from v$database; CONTROLFILE_CREATED --------------------
07-MAY-2010 16:27:22 ---we can recover the datafile test01.dbf
without backup using view plainprint?create datafile command in
recovery ---in this example i am going to create a table in testing
tablespace view plainprint?and deleted the test01.dbf datafile and
recover it without backup and view plainprint?create datafile
recovery command. SQL> create user jay identified by jay 2
default tablespace testing; User created. SQL> grant dba to jay;
Grant succeeded. SQL> select username,default_tablespace from
dba_users 2 where username='JAY'; USERNAME DEFAULT_TABLESPACE
------------------------------ ------------------------------ JAY
TESTING SQL> conn jay/jay; Connected. SQL> create table demo
(id number); Table created. SQL> insert into demo values(321); 1
row created. SQL> commit; Commit complete. SQL> select * from
demo; ID ---------- 321 SQL> conn sys/oracle as sysdba;
Connected. SQL> host rm -rf
/u01/app/oracle/oradata/testdb/test01.dbf ---manually deleting
datafile test01.dbf for testing purpose SQL> conn jay/jay;
Connected. SQL> select * from demo; ID ---------- 321 SQL>
alter system flush buffer_cache; System altered. SQL> select *
from demo; select * from demo * ERROR at line 1: ORA-01116: error
in opening database file 5 ORA-01110: data file 5:
'/u01/app/oracle/oradata/testdb/test01.dbf' ORA-27041: unable to
open file Linux Error: 2: No such file or directory Additional
information: 3 SQL> alter database datafile 5 offline; Database
altered. ----TO CREATE A NEW RECOVERED DATAFILE IN SAME LOCATION.
SQL> alter database create datafile
'/u01/app/oracle/oradata/testdb/test01.dbf'; Database altered.
----TO CREATE A NEW RECOVERED DATAFILE IN DIFFERENT LOCATION.
SQL> alter database create datafile
'/u01/app/oracle/oradata/testdb/test01.dbf' as
'/u03/oradata/test01.dbf'; Database altered. SQL> recover
datafile 5; ORA-00279: change 454443 generated at 05/07/2010
16:32:07 needed for thread 1 ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_8_%u_.arc
ORA-00280: change 454443 for thread 1 is in sequence #8 Specify
log: {=suggested | filename | AUTO | CANCEL} auto ORA-00279: change
454869 generated at 05/07/2010 16:41:38 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_9_%u_.arc
ORA-00280: change 454869 for thread 1 is in sequence #9 ORA-00278:
log file
'/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_8_5y7xcbrm_.arc'
no longer needed for this recovery ..... ....... ORA-00279: change
454874 generated at 05/07/2010 16:41:45 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_11_%u_.arc
ORA-00280: change 454874 for thread 1 is in sequence #11 ORA-00278:
log file
'/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_10_5y7xck8j_.arc'
no longer needed for this recovery Log applied. Media recovery
complete. SQL> alter database datafile 5 online; Database
altered. SQL> conn jay/jay; Connected. SQL> select * from
demo; ID ---------- 321 SQL>
5.Restore and Recovery of a Datafile to a different location.If
a non system datafile is missing and its original location not
available, restore can be made to a different location and recovery
performed. Pre requisites: All relevant archived logs.
1. Use OS commands to restore the missing or corrupted datafile
to the new location, ie: cp -p /user/backup/uman/user01.dbf
/user/oradata/u02/dbtst/user01.dbf 2. alter tablespace offline
immediate; 3. alter tablespace rename datafile
'/user/oradata/u01/dbtst/user01.dbf' to
'/user/oradata/u02/dbtst/user01.dbf'; 4. recover tablespace ; 5.
alter tablespace online; workshop 5:view plainprint?SQL> create
user lachu identified by lachu 2 default tablespace users; User
created. SQL> grant dba to lachu; Grant succeeded. SQL> conn
lachu/lachu; Connected. SQL> create table test_tb(id number);
Table created. SQL> insert into test_tb values(123); 1 row
created. SQL> commit; Commit complete. SQL> conn sys/oracle
as sysdba; Connected. SQL> ---manually deleting users01.dbf
datafile for testing purpose SQL> host rm -rf
'/u01/app/oracle/oradata/testdb/users01.dbf' SQL> conn
lachu/lachu; Connected. SQL> select * from tab; TNAME TABTYPE
CLUSTERID ------------------------------ ------- ---------- TEST_TB
TABLE SQL> select * from test_tb; select * from test_tb * ERROR
at line 1: ORA-00376: file 4 cannot be read at this time ORA-01110:
data file 4: '/u01/app/oracle/oradata/testdb/users01.dbf' SQL>
conn sys/oracle as sysdba; Connected. SQL> alter database
datafile 4 offline; Database altered. SQL> host cp -p
/u01/app/oracle/oradata/backup/users01.dbf /u03/oradata/users01.dbf
--restore datafile user01.dbf to new disk from the recent backup of
the database. SQL> alter tablespace users rename datafile 2
'/u01/app/oracle/oradata/testdb/users01.dbf' to
'/u03/oradata/users01.dbf'; Tablespace altered. SQL> recover
datafile 4; ORA-00279: change 454383 generated at 05/07/2010
01:40:11 needed for thread 1 ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_7_%u_.arc
ORA-00280: change 454383 for thread 1 is in sequence #7 Specify
log: {=suggested | filename | AUTO | CANCEL} auto ORA-00279: change
456007 generated at 05/07/2010 12:46:10 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_8_%u_.arc
ORA-00280: change 456007 for thread 1 is in sequence #8 ORA-00278:
log file
'/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_7_5y7hkty0_.arc'
no longer needed for this recovery .... ...... ORA-00279: change
457480 generated at 05/07/2010 13:09:30 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_15_%u_.arc
ORA-00280: change 457480 for thread 1 is in sequence #15 ORA-00278:
log file
'/u01/app/oracle/flash_recovery_area/TESTDB/archivelog/2010_05_07/o1_mf_1_14_5y7jxlvg_.arc'
no longer needed for this recovery Log applied. Media recovery
complete. SQL> alter database datafile 4 online; Database
altered. SQL> select name from v$datafile; NAME
---------------------------------------------
/u01/app/oracle/oradata/testdb/system01.dbf
/u01/app/oracle/oradata/testdb/undotbs01.dbf
/u01/app/oracle/oradata/testdb/sysaux01.dbf
/u03/oradata/users01.dbf ----------restored in new location (disk)
SQL> conn lachu/lachu; Connected. SQL> select * from tab;
TNAME TABTYPE CLUSTERID ------------------------------ -------
---------- TEST_TB TABLE SQL> select * from test_tb; ID
---------- 123
