Datafile recover in case of noarchivelog mode

my database is in noarchivelog mode and there is no backup available and one of my datafile is currupted then how can i recover the datafile??
thanx in advance

saugat chatterjee wrote:
my database is in noarchivelog mode and there is no backup available and one of my datafile is currupted then how can i recover the datafile??
thanx in advanceWhat ever version. To recover datafile archiving should be enabled. Noarchive norecovery...

Similar Messages

Redo log in case of NOARCHIVELOG Mode.

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This post is now available at .. Redo log files in case of NOARCHIVELOG Mode.
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Question is related with the oracle architure..
database requires a minimum of two redo log files to guarantee that one is always available for writing while the other is being archived, this sounds perfect when DB is running in ARCHIVELOG mode but at the same time it also forces database to have 2 redo log files even when the DB is running in NOARCHIVELOG mode?
Any particular reason..
I would look for reasons not answers on what redo log is and what information it holds etc..
Edited by: pgoel on Mar 12, 2011 4:04 PM

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SORRY, WRONG FORUM moving it to the corrent forum
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Edited by: pgoel on Mar 12, 2011 4:01 PM

How to recover a PDB in noarchivelog mode?

Hi all,
Urgent! We have a PDB currently in mount stage after restoring and recovering from backup. Whenever I tried to open it or recover data file, I keep getting this error message:
Errors in file C:\ORACLE\diag\rdbms\us022348\us022348\trace\us022348_p000_8788.trc:
ORA-01113: file 9 needs media recovery
ORA-01110: data file 9: 'D:\ORADATA\12C\US022348\0FB7D663771D443E8DE2229B76E0DCA7\DATAFILE\O1_MF_USERS_B2TVTBL1_.DBF'
The CDB and PDB both are in noarchivelog modes.
Which command should I use to bring the database back?
Thanks!!

I tried these but no luck.
RMAN> alter pluggable database PDBNAME open;
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of sql statement command at 12/15/2014 14:10:49
ORA-01113: file 9 needs media recovery
ORA-01110: data file 9: 'D:\ORADATA\12C\US022348\0FB7D663771D443E8DE2229B76E0DCA7\DATAFILE\O1_MF_USERS_B2TVTBL1_.DBF'
RMAN> alter pluggable database PDBNAME open resetlogs;
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of sql statement command at 12/15/2014 14:11:05
ORA-39862: RESETLOGS option only valid after a Pluggable Database incomplete recovery

Redo log files in case of NOARCHIVELOG Mode.

Question is related with the oracle architure..
database requires a minimum of two redo log files to guarantee that one is always available for writing while the other is being archived, this sounds perfect when DB is running in ARCHIVELOG mode but at the same time it also forces database to have 2 redo log files even when the DB is running in NOARCHIVELOG mode?
Any particular reason..
I would look for reasons not answers on what redo log is and what information it holds etc..

pgoel wrote:
If you had only one file all further changes would have to stop until all changed data blocks had been written to disc. By insisting on a minimum of two log files Oracle can allow the log writer to fill the second log file as the database writer writes out the dirty blocks covered by changes desrcibed in the first log file.What about having a big size redo log file instead of two? Checkppoint being initiated when the redo log file is half filled
I mean, understand the logic, two is better, even best.. but still not getting convinced. I am just trying to think, can not Oracle work with 1 group with 1 big file..specailly when Noarch mode ? Having
Edited by: pgoel on Mar 12, 2011 7:27 PMNo, you still didn't understand and I am not sure how else we can say it. Okay, think about log groups as two buckets which are used to fill the redo content. The LGWR is filling one bucket at a time till it can't accept any more content. Once filled, rather than spilling the content out, it jumps over to the second bucket. Now, taking your statement of big sized redo, Pgoel, it doesn't matter how big sized bucket you bring in, eventually it will fill in. Its not possible that you wont be able to fill it , it just would take more longer than the normal timings. Thats all. So in any case , you need the second bucket. And I am not sure that why you are struck on the archivelog mode. I hope you do understand that its an optional mode. This means, this may or may not be there. If there, its a good thing that before doing the flush of the redo content, Oracle would be able to save the contents in the archived (think about the name, it's very meaning is to preserve, to archive) log file. If not, the redo content wuold be lost and there won't be any record of transactions leaving you to reenter the lost transactions. Its a meaningless point on which you are struck i.e. the archive or no-archivelog mode. Be it whatever, Oracle would still need minimum of the two log groups.
HTH
Aman....

Taking the datafile offline when the database is in NOARCHIVELOG mode

My question is when the database is in No Archive log mode i'm not able to take the datafile offline.
When i tried in my computer i have noticed fallowing.
case1:
SYS>alter database datafile 5 offline;
ERROR at line1;
ORA-01145:offline immediate disallowed unless media recovery enabled.
case 2:
SYS>alter database datafile 5 offline immediate;
ERROR at line 1;
ORA-00933:SQL command not properly ended
case3:
I have tried the command alter database datafile 6 offline drop; (in NOARCHIVELOG mode) and it is showing the same effect as alter database datafile 6 offline; ( in ARCHIVELOG mode).
*In the NOARCHIVELOG mode are we really dropping the datafile to take the datafile offline? Will you please tell me the effect of keyword drop.

JohnWatson wrote:
You've marked your question answered - was that a mistake?
The answer is that you cannot directly take a datafile offline in noarchivelog mode. You must take the tablespace offline:
Hmm, are you certain about that? Perhaps I'm missing something.
SQL> select file_id, file_name, online_status, status from dba_data_files where tablespace_name = 'USERS';
   FILE_ID FILE_NAME                                          ONLINE_ STATUS
         4 /u01/app/oracle/oradata/TEST/users01.dbf           ONLINE AVAILABLE
SQL> select log_mode from v$database;
LOG_MODE
NOARCHIVELOG
SQL> alter database datafile 4 offline drop;
Database altered.
SQL> select file_id, file_name, online_status, status from dba_data_files where tablespace_name = 'USERS';
   FILE_ID FILE_NAME                                          ONLINE_ STATUS
         4 /u01/app/oracle/oradata/TEST/users01.dbf           RECOVER AVAILABLE
SQL> ALTER SYSTEM FLUSH BUFFER_CACHE; <-- may not have been necessary
System altered.
SQL> select count(*) from scott.emp;
select count(*) from scott.emp
ERROR at line 1:
ORA-00376: file 4 cannot be read at this time
ORA-01110: data file 4: '/u01/app/oracle/oradata/TEST/users01.dbf'
SQL> recover datafile 4;
Media recovery complete.
SQL> select file_id, file_name, online_status, status from dba_data_files where tablespace_name = 'USERS';
   FILE_ID FILE_NAME                                          ONLINE_ STATUS
         4 /u01/app/oracle/oradata/TEST/users01.dbf           OFFLINE AVAILABLE
SQL> alter database datafile 4 online;
Database altered.
SQL> select file_id, file_name, online_status, status from dba_data_files where tablespace_name = 'USERS';
   FILE_ID FILE_NAME                                          ONLINE_ STATUS
         4 /u01/app/oracle/oradata/TEST/users01.dbf           ONLINE AVAILABLE
SQL> select count(*) from scott.emp;
COUNT(*)
        14
Also, please see the following link from the manual which discusses altering data file availability in noarchivelog mode.
Altering Datafile Availability

Recover datafile in noarchivelog mode

hi all
i faced problem when opening the database that there are datafile needed recovery
i'm working in noarchivelog mode
i tried to take this datafile offline but this failed
what are the exactly procedures to recover this file ?

i tried to take this datafile offline but this failed Please check your alert log file. Since you are working with noarchivelog mode. You must be having a backup. Do you ?
what are the exactly procedures to recover this file ?You have not provided enough information but here are hints;
- What kind of backups you have? Rman or user managed backups?
Also read;
http://www.oracle.com/technology/documentation/index.html
Ex Senior DBA
Lazy: Those who do not read documentation

System datafile block corruption - no backups and database in NOARCHIVELOG mode

Dear All,
Database version - oracle 11.1 Enterprise
OS - RHELinux 5.8
What are the options of recovering from physical block corruption when there are no backup available to perform block media recovery?
V$DATABASE_BLOCK_CORRUPTION reports two segments corrupted (please see attached image for details).
1 table in system datafile - sys_fba_barrierscn
1 index - (applicaiton index)
What are my options?
I know there is a possibility that the database will not restart after a shutdown due to corruption in system tablespace.
Database is in noarchivelog mode. So online backups are not possible and there aren't any full backups either.
I am thinking of below,
1. Run dbms_repair with fix_block_corruption. - Still database startup might fail?
2. Shutdown the database and take offline full backup with RMAN MAXCorrupt option.
Appreciate your suggestions and advises.
Thanks
Stefan

Thanks Sybrand,
Agree with your first two suggestions .
Also scheduled a expdp job tonight. (Only backup like thing they had was a expdp cron, but until today all the large tables were failing due to small undo_retention).
Yes. Flashback is not used. So hopefully it will not affect the a database restart i guess?
Related to dbms_repair, I was referring to - http://askdba.org/weblog/2010/08/physical-corruption-ora-1578-part-3/.
Where DBMS_REPAIR.FIX_CORRUPT_BLOCKS and DBMS_REPAIR.SKIP_CORRUPT_BLOCKS used.
Which i think will not use any redo.
Thanks
Stefan

Recover database in NOarchivelog mode :)

Hi all. How to recover a database wich is in noarchivelog mode? B-)
Suppose,
I have 3 redolog groups (with two members in each, the second members are located on another drive ). When first redo log group was 1/2 full I took a full backup. Then there were 2 switches from first to second and from second to third. Now the currnet redolog group - 3 (just started). At this point we faced media failer. How to roll forward changes using backup + online redologs?
Edited by: Junior Oracle DBA on Oct 16, 2008 1:53 PM

Restore your database cold backup (excluding redo logs).
Then issue this command :
RECOVER DATABASE USING BACKUP CONTROLFILE
provide the names of the last ACTIVE / CURRENT Redo Logs in the database when Oracle prompts for an ArchiveLog.
When Oracle has finished recovery to a consistent point in time, it will return to the command prompt without any error.
Now issue this command :
ALTER DATABASE OPEN RESETLOGS
You would have a Complete Recovery.
This is provided that Oracle had NOT cycled through all the Online Redo Logs since the time when the Cold Backup was taken. (If Oracle had cycled through all the Online Redo Logs, it would have overwrriten the oldest log because it wasn't in ArchiveLog mode).
Hemant K Chitale
http://hemantoracledba.blogspot.com

Recover a deleted record in NOARCHIVELOG mode?

Hello,
I'm running 10gR2 in NOARCHIVELOG mode and we do not take backups (please, let's not get into a discussion about this!).
I need to know if there is any possible way to recover a record once it has been deleted and a COMMIT has been issued? A user inserted two records in the database that they should not have, and I need to verify there is no possible way to recover those once they have been deleted.
Thank you,
Mimi

Mimi Miami wrote:
Ok so my UNDO_RETENTION parameter is set to 900...so 15 minutes after I delete the records they should not be querable using Flashback Query any longer, right?No,
UNDO_RETENTION is low threshold value of undo retention. Meaning, Oracle will try to keep at least that time before overwritten.
However, it's not gurranteed if not enough undo tablespace available, meaning it can be overwritten before the value is up if not enough undo tablespace to serve new transaction.
On the other-hand, it will not remove the undo record until it's overwritten, meaning the record could stay there for considerable amount of time if your database is not busy and undo tablespace is big.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams222.htm#REFRN10225
Not sure what's the intention to make your delete irreversible,
you could actually create table newtable as select .. from old_table where <except the two records>.
Drop the old table and rename new table.
purge the recycle bin of your database

Back-up in noarchivelog mode

If running in NOARCHIVELOG mode, the script displays the following output:
Warning: Log archiving (ARCHIVELOG mode) is currently disabled. If
you restore the database from this backup, any transactions that take
place between this backup and the next backup will be lost. It is
recommended that you enable ARCHIVELOG mode before proceeding so
that all transactions can be recovered upon restore. See the section
'Enabling ARCHIVELOG Mode...' in the online help for instructions.
Backup with log archiving disabled will shut down and restart the
database. Are you sure [Y/N]?
i was wondering why will it be lost when i am going to make a current backup? I will obviously stop all transactions isn't it?

Case of archive log mode online redo log files dumped into archives. So let suppose you have full backup at morning 6 am.
If your database crashes around 8 am, you can restore 6 am backup and you option of recovery until 8am. So there is no data loss until you have archives.
Now we talk of noarchivelog mode, here online redo log files are not dumped because of noarchivelog mode of database.
You have backup at 6 am
Now the time is 8 am , your database crashed. Now you have to restore 6 am backup. Later there is no concept of recovery. It's just restore. Because you don't have archives to perform recovery.
So again archivelog mode depends on your business requirements.
Overall you have two hours of data loss in noarchivelog mode.
HTH.

ORA-01242: data file suffered media failure: database in NOARCHIVELOG mode

Hi All,
Need help from the gurus.
Currently we are in state unable to do anything.
Was using a database and all of a sudden it crashed. Tried to mount the database, open it, it failed. Also tried the recover and alter database open, even that failed. Errors are as follows.
Errors in file e:\oracle\product\10.2.0 \admin\devrevdb\bdump\devrevdb_p000_2620.trc:
ORA-00603: ORACLE server session terminated by fatal error
ORA-01242: data file suffered media failure: database in NOARCHIVELOG mode
ORA-00449: background process 'DBW0' unexpectedly terminated with error 1242
ORA-01242: data file suffered media failure: database in NOARCHIVELOG mode
In my spfile, the administrator has set only two control files and there is no mirroring and hence do not have another control file that will help me boot the db.
Please let me know how I should go about it. I am only a timebeing person trying to carryout a db activity. Any help would be of great help.

Hemant,
thanks for the reply.
I tried the way you suggested and it threw an error.
ORA-01145: offline immediate disallowed unless media recovery enabled
I searched and found that an additional tag of drop needs to be added to the command which you suggested.
ALTER DATABASE DATAFILE '<filename>' OFFLINE DROP.
i don't know what will the drop command have an effect ?
i have copied the data file to another location. Since i don't know much, i just want to be sure of what im doing.
if the above command is successfull, will it drop the datafile or the tablespace and i can no more use it. How can i use the copied datafile.
Thanks,
Sachin
I

ORA-01152 when restoring from RMAN backupset in NOARCHIVELOG mode

Hi all,
I got the error ORA-01152 when I tried restoring an Oracle 10g R1 database from an RMAN backupset into a new server. The error returned when it reached to the level of opening the database in resetlogs.
The database runs on NOARCHIVELOG mode and on Windows 2003 Server SP2 32-bit.
Following is what I did in RMAN:
set ORACLE_HOME=D:\oracle\product\10.1.0\db_1
set ORACLE_SID=DAWA
set PATH=D:\oracle\product\10.1.0\db_1\bin;%PATH%
cd %ORACLE_HOME%\bin
rman target sys/mypassword
Recovery Manager: Release 10.2.0.1.0 - Production on Tue Feb 13 00:36:55 2007
Copyright (c) 1982, 2005, Oracle. All rights reserved.
connected to target database (not started)
RMAN> startup nomount pfile=X:\temp\DawaPFILE.ORA
connected to target database (not started)
Oracle instance started
Total System Global Area 1048576000 bytes
Fixed Size 792200 bytes
Variable Size 551807352 bytes
Database Buffers 494927872 bytes
Redo Buffers 1048576 bytes
RMAN> restore controlfile from
'X:\temp\Flash_Rec\DAWA\AUTOBACKUP\2011_07_16\O1_
MF_S_756655133_7226R018_.BKP';
Starting restore at 19-JUL-11
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=270 devtype=DISK
channel ORA_DISK_1: restoring controlfile
channel ORA_DISK_1: restore complete
output filename=D:\ORACLE\ORADATA\DAWA\CONTROL01.CTL
output filename=D:\ORACLE\ORADATA\DAWA\CONTROL02.CTL
output filename=D:\ORACLE\ORADATA\DAWA\CONTROL03.CTL
Finished restore at 17-AUG-11
alter database mount;
database mounted
catalog backuppiece 'X:\temp\PUMHJATD_1_1';
catalog backuppiece 'X:\temp\PTMHJ91Q_1_1';
/* Rename the Redologfiles,so that they can be created in new locations
the database is opened in resetlogs */
SQL>conn sys as sysdba
-- get registered files from SELECT * FROM V$LOGFILE
SQL> alter database rename file
'D:\ORACLE\PRODUCT\10.1.0\ORADATA\DAWA\REDO01.LOG' to
'X:\oracle\oradata\dawa\REDO01.LOG';
alter database rename file 'D:\ORACLE\PRODUCT\10.1.0\ORADATA\DAWA\REDO02.LOG'
to 'X:\oracle\oradata\dawa\REDO02.LOG';
alter database rename file 'D:\ORACLE\PRODUCT\10.1.0\ORADATA\DAWA\REDO03.LOG'
to 'X:\oracle\oradata\dawa\REDO03.LOG';
alter database rename file 'D:\ORACLE\PRODUCT\10.1.0\ORADATA\DAWA\REDO04.LOG'
to 'X:\oracle\oradata\dawa\REDO04.LOG';
alter database rename file 'D:\ORACLE\PRODUCT\10.1.0\ORADATA\DAWA\REDO05.LOG'
to 'X:\oracle\oradata\dawa\REDO05.LOG';
alter database rename file 'D:\ORACLE\PRODUCT\10.1.0\ORADATA\DAWA\REDO06.LOG'
to 'X:\oracle\oradata\dawa\REDO06.LOG';
alter database rename file 'D:\ORACLE\PRODUCT\10.1.0\ORADATA\DAWA\REDO07.LOG'
to 'X:\oracle\oradata\dawa\REDO07.LOG';
/* Now in RMAN: restore the datafiles
    to new locations and recover. */
RMAN> run{
set newname for datafile
'E:\ORACLE\PRODUCT\10.1.0\ORADATA\DAWA\UNDOTBS201' TO
'D:\oracle\oradata\dawa\UNDOTBS201';
set newname for datafile
'E:\ORACLE\PRODUCT\10.1.0\ORADATA\DAWA\UNDOTBS202' TO
'D:\oracle\oradata\dawa\UNDOTBS202';
restore database;
switch datafile all;
alter database open resetlogs;
.../* alter database open resetlogs returned the errors: */
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of alter db command at 08/18/2011 08:44:45
ORA-01152: file 2 was not restored from a sufficiently old backup
ORA-01110: data file 2: 'D:\ORACLE\ORADATA\DAWA\UNDOTBS206'Thanks in advance.

SYS @ DAWA> shutdown immediate
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
SYS @ DAWA> startup mount
ORACLE instance started.
Total System Global Area 1048576000 bytes
Fixed Size                   792200 bytes
Variable Size             551807352 bytes
Database Buffers          494927872 bytes
Redo Buffers                1048576 bytes
Database mounted.
SYS @ DAWA> recover database using backup controlfile until cancel;
ORA-00279: change 329012 generated at 03/08/2005 16:24:46 needed for thread 1
ORA-00289: suggestion :
X:\ORACLE\ORADATA\FLASH_REC\DAWA\ARCHIVELOG\2011_08_18\O1_MF_1_6_%U_.ARC
ORA-00280: change 329012 for thread 1 is in sequence #6
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00308: cannot open archived log
'X:\ORACLE\ORADATA\FLASH_REC\DAWA\ARCHIVELOG\2011_08_18\O1_MF_1_6_%U_.ARC'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: 'X:\ORACLE\ORADATA\DAWA\SYSTEM01.DBF'You can download the alert log from here:
http://ahmedbaraka.com/temp/alertdawa.log

Restoring backup taken in NOARCHIVELOG mode

Hi I have a test database in noarchivelog mode. The backup I am implementing involves:
Shutting down the database in immedtiate mode. Taking a complete backup of the
a) Datafiles
b) Controlfiles
c) Redo log files
d) Parameter file
e) Password file
Now, when I want to restore in case of any media failure, I will copy all the above file to their respective locations.
Here my question is that, do I require to open the database after restoring all the datafiles,controlfile and redo files(in particular) in the RESETLOG mode or as I will be overwriting the current useless redo log files with the backup redo log files, I can just open the database normally?
What I am thinking is to open the database with alter database open
Please comment with full explanation.

>
Hi I have a test database in noarchivelog mode. The backup I am implementing involves:
Shutting down the database in immedtiate mode. Taking a complete backup of the
a) Datafiles
b) Controlfiles
c) Redo log files
d) Parameter file
e) Password file
Now, when I want to restore in case of any media failure, I will copy all the above file to their respective locations.
Here my question is that, do I require to open the database after restoring all the datafiles,controlfile and redo files(in particular) in the RESETLOG mode or as I will be overwriting the current useless redo log files with the backup redo log files, I can just open the database normally?
What I am thinking is to open the database with alter database open
>
Your thinking is right :-) You have chosen the simplest but not necessarily most efficient or reliable backup method. You simply get the whole database back from backup, so there is no resetlogs necessary. But keep in mind that you lose all modifications since your backup.
Kind regards
Uwe
http://uhesse.wordpress.com

Media failure in Noarchivelog mode

Dear all,
I am running Oracle database 10g in noarchivelog mode.
It has a media failure, a datafile has corrupted. How can i recovery it suppose i dont have the latest backup?
Thanks and regards,
Steve

Hi,
since you don't have a backup, and you have a media failure, you cannot recover.
You can set the tablespace/datafile in question offline, and work with whatever is left in the remaining datafiles. (i.e. export/import elsewhere)
if the file is just corrupted, and not lost,
you may be able to get some of the data back using oracles data unloader, but that is going to be expensive (i.e. you would need to engage oracle consulting to do it for you)
i strongly recommend you get familiar with the rman tool next time around, this is quite capable of performing backup and recovery.
Karsten

Recovery in noarchivelog mode

Scenario :
- Database is in noarchivelog mode.
- There are two redo logs for a database.
- A closed database backup was taken at log sequence 144.
- While the database was at log sequence 145, data file 2 was lost.
how can i recover the database till log sequence 145.
Kindly help me in this regard.

Hi,
If Current log sequence 145
& If log sequence 144 not overwritten the time cold backup (all datafiles+controlfile+redo logfile ) was taken, then use following steps:
1> shutdown ( if database is open)
2> restore only corrupted datafile
3> startup mount
4>recover database
5> alter database open

Datafile recover in case of noarchivelog mode

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