Recovery in noarchive mode

My oracle database 11g running in no archive mode, Accidently some of the user datafiles move to some other location
and them move back to same location with os command while database running in open mode , at that point in time redo log files changing frequently , Currently database is in open mode and can not be shutdown because of those files which have different version than other file and controlfile ,No backup is available , Is there any way to recover these files
Regards
obaid

Hi,
(1) As db is in no archive mode so you wont be able to apply redo and do recovery.since redo log file gets written in cyclic order after each switch log.
(2) now replaced files are inconsistent with other files and recovery is not possible to make files consistent.
i guess u r db corrupt. take help of oracle support OR
Now one way u can offline replaced files using following command and keep running the database for other schema which are working file.
alter database datafile 'location' offline ;
Edited by: Rajesh.Rathod on Oct 3, 2012 5:20 AM
Edited by: Rajesh.Rathod on Oct 3, 2012 5:38 AM

Similar Messages

Logical Standby Database in NOARCHIVE Mode

Hi,
I have configured a Logical Standby Database for Reporting purposes. A Physical Standby Database is running for MAA. i.e. in case of Role Transition (switch/Failover) the Physical Stdby Db will get the role of the Primary.
The logical standby database is creating a lot of Archive Redologs files, nearly every minute. Redolog files are 50MB and there is no work done in db during the time. I'm NOT using Standby Redolog files.
Is there a need for logical standby database to be in NOARCHIVELOG mode? The Primary is definatley in ARCHIVELOG mode.
Thanks for any responses.
regards
Sahba

hi,
well there are two things to the above:-
1. there was an archive file nearly every minute:
this is due to a db recovery. for some reason, the db was in inconsistent state, after a sudden shutdownof the OS. I was on a test environment, on windows vista, unfortunately. unimportant ... a reboot solved it.
2. Logical standby db in NOARCHIVE MODE when setup for the purpose of Reporting.
As long as the MAA configured for the primary db, such as physical standby db, and a second, the logical standby db setup purely for the purpose of reporting, which then can run with NOARCHIVELOG mode, after converting the physical standby db to logical.
logical standby db uses Streams architecture, so this method brings cost, time and performance advantages to the customer.
regards
Sahba

NOARCHIVE mode and datafile DROP OFFLINE

I have a 10gR2 database on linux that I use for testing. The db is in NOARCHIVE mode.
I had created test tablespaces on a NAS (as opposed to the system tables on the local machine). The NAS crashed, losing the drive mapping on the db machine. Of course, I couldn't start the database due to the missing datafiles. I did an 'alter database datafile 'xxxx' drop offline', which put the datafiles in RECOVERY mode in the datafiles view.
Amazingly, I was able to recover the NAS several days later, and the datafiles.
Is there any way to restore them after a drop offline? When I try to online them, I get recovery needed, when I try to recover, none of the redo logs have the right checkpoint. (The checkpoint needed is less than what are in the redo logs)
I don't care about any data that might have been lost. The data was static for months.
Any suggestions?
Edited by: user10822921 on Nov 4, 2009 5:03 AM

If the database is asking for recovery when you online the files, and you don't have those transactions in the redo logs, you can't recover to a consistent point in time to online the files.
# Note that the following is not supported by Oracle Support. You may want to ask them for a second opionion.
You could try taking a copy of all files to another location, recreate the controlfile, and use parameter "_allow_resetlogs_corruption=TRUE" to allow "open resetlogs" to ignore the inconsistent SCN. If it works, you should be able to export the data in the copy database, drop the objects in PROD, and re-import.

Recovery in NOARCHIVELOG mode. A Sybex Study GUide quibble

Hi.
Actually, this is much more than a quibble as its a crucial point vis a vis the exam.
To perform a recovery in noarchivelog mode, we have to restore the db from the last backup.
I was under the impression that a backup of the database should NOT include the online redo logs.
But, to quote this Sybex book (p291 for Exam 032):
"To perform the database restore, you will need to copy all the data files, online redo logs, and controlfiles from the last backup and perform a full database restore" .
I understand that if we do a closed backup (as we would do if the db is in noarchivelog mode) then the redo logs are not available to be backed up and therefore are not included.
I just need this detail ironed out once and for all!
Thanks.
DA

When you restore the redo log file, you are basically defining the most recent time to which the restore can occur.
In a noarchivelog restore (of a proper clean backup), the most recent possible time is the time when the database was shut down and thus there are no redo entries to roll forward. Therefore, functionally, it really does not matter whether the redo log is restored or not. However, if the redo log file is not restored, you have two situations that must be managed: redo is much newer than the rest of the database, or redo is totally missing. Since you are in learning mode, I'll leave it to you to describe how to handle those two cases.
In an archivelog environment, restoring the redo log will severely limit the ability to restore to point-in-time as you can not move forward from the redo log's time. Therefore the recommendation is to not bother backing up the redo log file at all, so it can not be accidently restore. RMAN enforces this.
Personal 'best practice' is to make a safety copy of the redo log files before any restore. That way if an old set of redo is accidently copied or if the restore/recovery needs to be restarted, the environment can be reset to the start of the restore.

Backup method in Noarchive mode

Hi All,
I have one question regarding backup methods. I have my all database in Oracle11gR2 in Noarchive mode. I want to define some backup method but no idea which one is preferable in noarchive mode. Cold backup is again not possible. can I take tablespace/datafile backup ? Is there any other option which I can perform in Noarchive mode or temporarily put the database in Archive and perform the backup?
Please guide me.
Thanks...

user12115 wrote:
Hi All,
First of all thanks for your reply and suggestions. I have not lost the interest but reading and thinking on all your suggestion.
About expdp yes I think this is the only option I was thinking before post a question here. but as we know this is should not consider as a backup.
For Archive mode - this is R&D database and we have disk space issue if we can not put database in Archive mode.
For COld backup - again not possible because single database uses in different time zone so DB should be up and running almost all the time.I think the operative word there is "almost". How big is the database? How long does it take to shut it down, back it up, and bring it back up? Unless the database is really big (why would an r&d database be really big, unless r&d was specific to VLDB) you should be able to do the job during the guy's lunch break. Even for an r&d database, you might be able to justify noarchivelog, but you will really feel the pain if you get a physically corrupted database and all you have is an export.
>
The only one option which I am not aware is what about John speicified. John can you please suggest or forward me some link with some backup example for more details. this is really helpful to me. From your suggested link I understand this is possible but after put the database in suspend mode how do I copy the Tablespace/datafiles - just simple Linux cp command or some other options also?
Edited by: user12115 on Mar 5, 2013 5:08 AM
Edited by: user12115 on Mar 5, 2013 5:15 AM

Changing the noarchive mode online

Hi,
Our Oracle database(10g) is running an archive mode currently.
we have to change the mode to noarchive mode without downtime.
Can I change the mode through the online ?
Please advise me !
Thanks

Are you planning on doing this historical data load while the database is up and servicing the existing application(s) and user(s) as normal? Or are you planning to make the database inaccessible to those users during the load?
If you really cannot have any downtime during the load, you may be able to reduce your redo generation using various NOLOGGING options an the /*+ APPEND */ hint, but probably not a lot.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

How to change from archive mode to noarchive mode

Hi,
I am running 10gR2 on Windows.
Does any one know the steps to change the database which is current in archive mode to noarchive mode?
Thanks

shutdown immediate
startup mount
alter database noarchivelog;
alter databae open;
archvie log list -- to check whether the archive mode is turned off or no.
Make sure you backup the database before and after.
Jaffar

HT1386 I plugged my Ipod into my laptop and it wont go off the apple logo, when i open itunes it wont even come up with my ipod and recovery and DFU mode dont change things. How can i fix this?

it wont go off the apple logo, putting it in recovery and DFU mode dosent change a thing, how can i fix it?

See if you missed anything here
Try:
- iOS: Not responding or does not turn on
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try on another computer
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar

RECOVERY IN NOARCHIVE LOG MODE

Dear all,
Please help me in solving this recovery issue :
My database is : oracle 8i server ent.edition
database runs on windows 2000
db confgiured in no archive logmode
when I start the database today :
am getting the following error :
O/S-Error: (OS 23) Data error (cyclic redundancy check).'
error 1242 detected in background process
ORA-01242: data file suffered media failure: database in NOARCHIVELOG mode
ORA-01114: IO error writing block to file 2 (block # 1936)
ORA-01110: data file 2: 'c:\ORACLE\ORADATA\ORACLE\RBS01.DBF'
ORA-27072: skgfdisp: I/O error
OSD-04008: WriteFile() failure, unable to write to file
O/S-Error: (OS 23) Data error (cyclic redundancy check).
this tablespace rbs is defined only for rollback segments..
since db in noarhicve log mode, I cant able to take the datafile offline.. I tried doing
ALTER DATABASE RECOVER
which resulted in the above error .
I have valid 1 month old cold backup..
when I try to drop the tablespace, it fails with the above error.. .
Please guide me as this is the production database..
Thanks in advance
Please help me
Kai

Were you able to achieve a NORMAL or IMMEDIATE shutdown of the database ?
In that case the Rollback segments are not required at startup.
So,
1 comment out the entry "rollback_segments=...(namesofrollbacksegments)"
from the init.ora
2. connect / as sysdba and STARTUP MOUNT;
3. ALTER DATABASE DATAFILE '<filenameforRBS>' OFFLINE DROP ;
4. ALTER DATABASE OPEN;
Additional steps : CREATE ROLLBACK SEGMENT SYS_RBS01
TABLESPACE SYSTEM;
ALTER ROLLBACK SEGMENT SYS_RBS01 ONLINE;
5. DROP TABLESPACE RBS ; (check the name of the tablespace)
6. CREATE TABLESPACE RBS (or NEWRBS) DATAFILE ....
7. CREATE ROLLBACK SEGMENT ........ and create multiple segments in
the new RBS tablespace
8. SHUTDOWN
9. Edit init.ora to set the rollback segment names again
10. STARTUP
HOWEVER if your database shutdown was not normal or immediate but an
abort, Oracle would try to do an Instance Recovery. In that case, you would
need to use "_corrupted_rollback_segments" and may lose data consistency.
Check MetaLink for notes on that. But first check your shutdown and see if
you can follow the steps suggested by Sybrand and me.
Added additional steps for SYS_RBS01 in the SYSTEM
tablespace for any actions on the RBS tablespace.
Message was edited by:
Hemant K Chitale

TS1441 My iPod touch 5th generation is stuck in recovery and restart mode

I have an iPod touch 5th generation and i plugged it into my laptop and it told me about the new update so i updated, but then it restarted and it put my iPod into recovery mode and no matter how many times i try and recover it it wont go away. I've searched the internet for all kinds of answers and nothing is helping, and my town doesn't have an apple store. PLEASE HELP ME

Try:
- iOS: Not responding or does not turn on
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try on another computer
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar

I updated my iphone4s from the phone it self and know its stuck in recovery or dfu mode how do i get out of this mode iv tried everything with buttons on the phone nothing itune wont even accept it

i updated my iphone 4s ios from the phone it self it load with on sreen a apple with load line when done it said connet to itunes but wont it doesnt read i dont want to restore and lose all my photos and videos i went to best buy and they tried toget my photos of when all the screen says connet to itunes i went to virizon they tried transwering my datat to another phoe nothing went apple all they can do is restore i dont want to so the aid sent it to drivesavers if i do that it could cost anywhere from 400-1200 is there aby to get my phone open without losing any of my stuff if i dont want to send the phone to drivesavers please help

It's in recovery mode. There is nothing left on the phone. You have no choice but to restore it. Have you not been backing it up on a regular basis?

Oracle recovery in noarchivelog mode

Hello,
SAP Release : ECC6
Oracle 10G
Solaris 10g
Our SAP system is in noarchivelog mode (formation environnement, with frequent client copies).
We frequently perform an offline backup.
The solaris server that is hosting our Sap system, has been brutally shutdown this morning,
due to a network issue.
Afterwards, we had to restart the sap system.
A fisrt error occured ; inconsistency between the control files ...
ORA-00205: error in identifying control file, check alert log for more info
In alert log :
ORA-00202: control file: '/oracle/ZMA/origlogA/cntrl/cntlrZMA.dbf'
ORA-27037: unable to obtain file status
We regenerated a new control file and replaced it.
The error was solved.
Then a second error occured :
SQL> startup
ORACLE instance started.
Total System Global Area 1660944384 bytes
Fixed Size                  2268216 bytes
Variable Size             851207112 bytes
Database Buffers          805306368 bytes
Redo Buffers                2162688 bytes
Database mounted.
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
SQL> alter database open resetlogs ;
alter database open resetlogs
ERROR at line 1:
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/oracle/ZMA/sapdata1/system_1/system.data1'
SQL> recover database using backup controlfile until cancel ;
ORA-00279: change 647063400 generated at 04/28/2008 11:10:01 needed for thread
1
ORA-00289: suggestion : /oracle/ZMA/oraarch/ZMAarch1_76005_618576658.dbf
ORA-00280: change 647063400 for thread 1 is in sequence #76005
The redo log #76005 is no more available; I tried to apply the online redo logs, but it didn't help.
We had to restore the whole database from the offline backup.
1/ I still have problems understanding why Oracle is asking for a recovery, when we tried to reopen the database ? The database was consistent this morning, how is it that the file '/oracle/ZMA/sapdata1/system_1/system.data1' became inconsistent ?
2/ In sap note 863417 "If the database operates in NOARCHIVELOG mode, the database can ONLY be completely recovered from instance failure but not from media failure. "
What is exactly the difference between media failure and instance failure ?
Does a network problem and then a reboot of the host is considered a media failure ?
Best Regards.
thank you for your help .

> 1/ I still have problems understanding why Oracle is asking for a recovery, when we tried to reopen the database ? The database was consistent this morning, how is it that the file '/oracle/ZMA/sapdata1/system_1/system.data1' became inconsistent ?
Because the database was not shut down cleanly. An open database is by definition "inconsistent" without the proper logfiles.
> 2/ In sap note 863417 "If the database operates in NOARCHIVELOG mode, the database can ONLY be completely recovered from instance failure but not from media failure. "
> What is exactly the difference between media failure and instance failure ?
Media = File/Raw-Device. If you database is crashing due to a software error it can be recovered, if a file is corrupt it can't be (since you have no redo logs).
> Does a network problem and then a reboot of the host is considered a media failure ?
A corrupt control file (e. g.) is a media failure.
Markus

Database Recovery in NOARCHIVELOG Mode

Hi All,
I was trying to 'startup' my database & encountered the following error in the alert.log
ORA-01242: data file suffered media failure: database in NOARCHIVELOG mode
ORA-01122: database file 469 failed verification check
ORA-01110: data file 469: '/ora/ctcm_uat02/CMOLP1/undo/CMOLP1_undots_30.dbf'
ORA-01209: data file is from before the last RESETLOGS
I then looked up on the internet and since the error was related to the UNDO TABLESPACE, i did the following:
sql>startup mount
sql>alter database datafile '/ora/ctcm_uat02/CMOLP1/undo/CMOLP1_undots_30.dbf' offline drop;
sql>alter database open
Thereafter the database kept on erroring on all the datafiles belonging to the undo tablespaces and i dropped all the datafiles belonging to the undo tablespace using the above command. (alter database datafile ....offline drop).
Next, i tried to open the database and got the following error from the alert log:
Tue May 12 18:15:24 2009
alter database open
Tue May 12 18:15:33 2009
Beginning crash recovery of 1 threads
Tue May 12 18:15:33 2009
Started redo scan
Tue May 12 18:15:33 2009
Completed redo scan
21 redo blocks read, 3 data blocks need recovery
Tue May 12 18:15:33 2009
Started recovery at
Thread 1: logseq 252, block 2, scn 1917.14626262
Tue May 12 18:15:33 2009
Recovery of Online Redo Log: Thread 1 Group 3 Seq 252 Reading mem 0
Mem# 0 errs 0: /ora/ctcm_dev/CMOLP1/redo/CMOLP1_redo03a.dbf
Tue May 12 18:15:33 2009
Completed redo application
Tue May 12 18:15:33 2009
Ended recovery at
Thread 1: logseq 252, block 23, scn 1917.14646284
3 data blocks read, 3 data blocks written, 21 redo blocks read
Crash recovery completed successfully
Tue May 12 18:15:35 2009
Thread 1 advanced to log sequence 253
Thread 1 opened at log sequence 253
Current log# 4 seq# 253 mem# 0: /ora/ctcm_dev/CMOLP1/redo/CMOLP1_redo04a.dbf
Successful open of redo thread 1
Tue May 12 18:15:38 2009
LOG_CHECKPOINT_INTERVAL was set when MTTR advisory was switched on.
Tue May 12 18:15:38 2009
SMON: enabling cache recovery
Tue May 12 18:15:38 2009
Successfully onlined Undo Tablespace 1.
Tue May 12 18:15:39 2009
SMON: enabling tx recovery
Tue May 12 18:15:39 2009
Database Characterset is US7ASCII
Tue May 12 18:15:39 2009
SMON: about to recover undo segment 1
Can someone please help me on this issue? Thanks and Regards

Hi ERROR,
I think i figured out the hidden parameter that you were referring to.
(1) I set the allowresetlogs_corruption=TRUE and commented undo_management. Then opened the database using--> alter database open resetlogs;
But still was not able to start the database. The alert log entries are as below:
ALTER DATABASE MOUNT
Thu May 14 18:11:56 2009
Successful mount of redo thread 1, with mount id 4113112614
Thu May 14 18:11:56 2009
Database mounted in Exclusive Mode.
Completed: ALTER DATABASE MOUNT
Shutting down instance: further logons disabled
Shutting down instance (immediate)
License high water mark = 2
Thu May 14 18:12:05 2009
ALTER DATABASE CLOSE NORMAL
ORA-1109 signalled during: ALTER DATABASE CLOSE NORMAL...
Thu May 14 18:12:05 2009
ALTER DATABASE DISMOUNT
Completed: ALTER DATABASE DISMOUNT
ARCH: Archiving is disabled
Shutting down archive processes
Archiving is disabled
Archive process shutdown avoided: 0 active
ARCH: Archiving is disabled
Would be great if you can help me further on this.
Regards,
Fuzzy

Can we use online redo log to recover lost datafile in NOARCHIVE mode?

I am working on OCA exam and confued about these 2 sample questions. (similar questions with totally different answer)
Please give me hint about the different between these 2 questions.
** If the database is in NOARCHIVELOG mode, and one of the datafile for tablespace USERS is lost, what kind of recovery is possible? (answer: B)
A. All transactions except those in the USERS tablespace are recoverable up to the loss of the datafile.
B. Recovery is possible only up to the point in time of the last full database backup.
C. The USERS tablespace is recoverable from the online redo log file as long as none of the redo log files have been reused since the last backup.
D. Tablespace point in time recovery is available as long as a full backup of the USERS tablespace exists.
** The database of your company is running in the NOARCHIVELOG mode. You perform a complete backup of the database every night. On Monday morning, you lose the USER1.dbf file belonging to the USERS tablespace. Your database has four redo log groups, and there have been two log switches since Sunday night's backup.
Which is true (answer: B)
A. The database cannot be recovered.
B. The database can be recovered up to the last commit.
C. The database can be recovered only up to the last completed backup.
D. The database can be recovered by performing an incomplete recovery.
E. The database can be recovered by restoring only the USER!.dbf datafile from the most recent backup.

I think Gaurav is correct, you can recover to the last commit even in NOARCHIVELOG, as long as all the changes in the redo logs have not been overwritten. So answer should be B for question 2.
Here is my test:
SQL> select log_mode from v$database;
LOG_MODE
NOARCHIVELOG
SQL> select tablespace_name, file_name from dba_data_files;
TABLESPACE_NAME
FILE_NAME
USERS
C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORA101RC\USERS01.DBF
SYSAUX
C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORA101RC\SYSAUX01.DBF
UNDOTBS1
C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORA101RC\UNDOTBS01.DBF
SYSTEM
C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORA101RC\SYSTEM01.DBF
DATA
C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORA101RC\DATA01.DBF
SQL> create table names
2 ( name varchar(16))
3 tablespace users;
Table created.
so this segment 'names' is created in the datafile users01.
At this point I shut down and mount the DB, then:
RMAN> backup database;
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:29
Finished backup at 06-OCT-07
SQL>alter database open
SQL> insert into names values ('pippo');
1 row created.
SQL> commit;
Commit complete.
SQL>shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
At this point I delete datafile users01 and restart:
SQL> startup
ORACLE instance started.
Total System Global Area 167772160 bytes
Fixed Size 1247900 bytes
Variable Size 67110244 bytes
Database Buffers 96468992 bytes
Redo Buffers 2945024 bytes
Database mounted.
ORA-01157: cannot identify/lock data file 4 - see DBWR trace file
ORA-01110: data file 4: 'C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORA101RC\USERS01.DBF'
restoring the backup taken before inserting the value 'pippo' in table names:
RMAN> restore database;
Starting restore at 06-OCT-07
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile backupset restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
restoring datafile 00001 to C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORA101RC\SYSTEM01.D
BF
restoring datafile 00002 to C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORA101RC\UNDOTBS01.
DBF
restoring datafile 00003 to C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORA101RC\SYSAUX01.D
BF
restoring datafile 00004 to C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORA101RC\USERS01.DB
F
restoring datafile 00005 to C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORA101RC\DATA01.DBF
channel ORA_DISK_1: reading from backup piece C:\ORACLE\PRODUCT\10.2.0\DB_1\DATA
BASE\0AITR52K_1_1
channel ORA_DISK_1: restored backup piece 1
piece handle=C:\ORACLE\PRODUCT\10.2.0\DB_1\DATABASE\0AITR52K_1_1 tag=TAG20071006
T181337
channel ORA_DISK_1: restore complete, elapsed time: 00:02:07
Finished restore at 06-OCT-07
RMAN> recover database;
Starting recover at 06-OCT-07
using channel ORA_DISK_1
starting media recovery
media recovery complete, elapsed time: 00:00:05
Finished recover at 06-OCT-07
SQL> alter database open;
Database altered.
SQL> select * from names;
NAME
pippo
SQL>
enrico

Backup and Recovery in different mode

We have a database in noarchivelog mode.
Currently we convert it to archivelog mode before monthly full database RMAN backup.
And after backup,we again back it to noarchivelog mode.
Now my question is that, in case of failure can we recover this database(any how) with that backup?
Please advice and if possible give the recovery steps.
Thanks & Regards
Quazi Abdur Rab

Hi,
It's not good to switch from Archive Log Mode and No Archive Log Mode as your wish.
See, As Khurram had explained you the thing. Point in time recovery before crash is quite not possible but only last the restore point applicable for your DB. Rest of the things can be recovered. Why are the implications you are facing if the DB is in Archive Mode. ?? I Suggest do peform and maintain Archive Log which is good for your DB.
- Pavan Kumar N

Recovery in noarchive mode

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