How to damage online redo log for simulation

Dear All,
Kindly please help to inform me, is there any way to damage online redo log from database level (not from OS command like dd) ?
I need to do it for test case to enable db_block_checking and db_block_checksum (set both parameter to TRUE).
Is those parameter will help from redo log corruption ? that's why, i want to prove it.
Thanks
Anthony

user12215770 wrote:
My purpose is i want to verify that the db_block_checking and db_block_checksum can avoid redo corruption (the corruption caused by process in the database).Redo corruption could also occur due to other issues as http://docs.oracle.com/cd/E11882_01/server.112/e25513/initparams049.htm#REFRN10030 says:
>
Checksums allow Oracle to detect corruption caused by underlying disks, storage systems, or I/O systems. If set to FULL, DB_BLOCK_CHECKSUM also catches in-memory corruptions and stops them from making it to the disk.
>
You could try to use ORADEBUG POKE command to write directly in the SGA if you know how to find log buffer blocks ... About ORADEBUG please read http://www.juliandyke.com/Diagnostics/Tools/ORADEBUG/ORADEBUG.html.

Similar Messages

Online Redo logs instead of Standby Redo logs

RDBMS Version: 11.2.0.3/Platform : RHEL 6.3
To migrate a 3TB Database to a new DB server , we are going to use RMAN DUPLICATE.
Step1. Take full backup of DB + Standby Control file at primary site and transfer the Bkp files to Standby site
Step2. At standy site, we will run the RMAN duplicate target database for standby
After the above step, we don't want to create the standby redo logs because the newly restored DB in standby server is going to be the new Prod DB which application will be pointing to.
So, Can I skip the Standby Redo log creation part and create Online redo logs instead ?
As mentioned earlier, Our objective is not to create a proper Dataguard Standby DB setup. We just want to clone our DB to another server using RMAN Duplicate.

Tom wrote:
RDBMS Version: 11.2.0.3/Platform : RHEL 6.3
To migrate a 3TB Database to a new DB server , we are going to use RMAN DUPLICATE.
Step1. Take full backup of DB + Standby Control file at primary site and transfer the Bkp files to Standby site
Step2. At standy site, we will run the RMAN duplicate target database for standby
After the above step, we don't want to create the standby redo logs because the newly restored DB in standby server is going to be the new Prod DB which application will be pointing to.
So, Can I skip the Standby Redo log creation part and create Online redo logs instead ?
As mentioned earlier, Our objective is not to create a proper Dataguard Standby DB setup. We just want to clone our DB to another server using RMAN Duplicate.
Hi,
Take full backup of DB + Standby Control
We just want to clone our DB to another server using RMAN Duplicate
If you want only clone database of production, why you are take Standby controlfile?
If you don't want create standby database then, why you using DUPLICATE command with FOR STANDBY option.
You can use DUPLICATE command for clone database, without for standby option.
If you say no, we want create standby database and we will perform swithover,
then yes, you can use online redo logs for max performance mode.
and you can create standby redo logs on all database, but this redo logs will use by database when database role
is standby.
Regards
Mahir M. Quluzade

Non-multiplexed online redo log file damaged

how to fix if non-multiplexed online redo log file damaged , looking for info for both current & inactive..

If you only want to practice your skills these are good scenarios to do it. But if you are currently facing this problem then you are in big troubles if it happens to be the CURRENT. When this issue appears I suggest you not to shutdown the instance you should be aware that information written on the redo log is the backup of the running transactions in memory. If both get lost data is lost, if either one survives your chances to recover data are high.
~ Madrid
http://hrivera99.blogspot.com

Separate ASM diskgroup for Online redo logs

Version: 11.2.0.3
Platform : Solaris 10
One of the Hitachi support guy has suggested to create a separate disk group for Online redo logs. His rationale was that ORLs was write only files and it would be better to put in a separate disk group.
What do you guys think ?

Tom wrote:
Version: 11.2.0.3
Platform : Solaris 10
One of the Hitachi support guy has suggested to create a separate disk group for Online redo logs. His rationale was that ORLs was write only files and it would be better to put in a separate disk group.
What do you guys think ?
A separate disk group for just the ORL's? The files are indeed write only but that does'nt mean that you would need to "isolate" them over a few disks by putting them in an individual disk group. With one diskgroup spread across several disks, ORL's would enjoy a better IO bandwidth as ASM knows how to deal with them by allocating the AU size of 128kb for them. So as the suggestion factor goes, mine is a no. If you haven't experienced a really really bad performance impact due to the ORL's than may be, you may want to think doing it.
Aman....

Windows Modified date for online redo logs

I am doing a full database backup (oracle 10g) weekly and incremental backups nightly. The database is running in archivelog mode and I am multiplexing the online redo logs. However, when I look in windows the modified date for all Redo logs is displayed at the time the database was started up (Sunday night)... datafiles, controlfiles etc... show the latest modified date correctly.
Is this normal that the modified date is not updating on redo logs or do I need to do something else to ensure my online redo is operating correctly.
Any help would be appreciated.

Redo3 was the setting before the switch... redo1 is now the current log. As regards the alert log... what file should I check... there is nothing showing in OEM.
MEMBER
GROUP# STATUS
D:\ORACLE\PRODUCT\ORADATA\WATLI1\REDO03.LOG
3 ACTIVE
D:\ORACLE\PRODUCT\ORADATA\WATLI1\REDO02.LOG
2 INACTIVE
D:\ORACLE\PRODUCT\ORADATA\WATLI1\REDO01.LOG
1 CURRENT
MEMBER
GROUP# STATUS
E:\BACKUP\ONLINELOGS\REDO01_A.LOG
1 CURRENT
E:\BACKUP\ONLINELOGS\REDO02_A.LOG
2 INACTIVE
E:\BACKUP\ONLINELOGS\REDO03_A.LOG
3 ACTIVE

Moving the online redo log files to different location

We just installed few more drives into our sandbox system and I want to move the online redo log files for better performance. We've got the SAPARCH directory moved to a different location.
Does anyone know how/where I can change the parameters so redo log files are pointed at different drives? It's not in the <b>init<SID>.ora</b> file...
Regards,
Sumit

Hi Sumit,
The following link contains information about moving the redo logs:
http://www.stanford.edu/dept/itss/docs/oracle/9i/server.920/a96521/onlineredo.htm
Best regards,
Alwin

The file structure online redo log, archived redo log and standby redo log

I have read some Oracle documentation for file structure and settings in Data Guard environment. But I still have some doubts. What is the best file structure or settings in Oracle 10.2.0.4 on UNIX for a data guard environment with 4 primary databases and 4 physical standby databases. Based on Oracle documents, there are 3 redo logs. They are: online redo logs, archived redo logs and standby redo logs. The basic settings are:
1. Online redo logs --- This redo log must be on Primary database and logical standby database. But it is not necessary to be on physical standby database because physical standby is not open. It doesn't generate redo log. However, if don't set up online redo log on physical standby, when primary failover and switch standby as primary. How can standby perform without online redo logs? In my standby databases, online redo logs have been set up.
2. Archived redo logs --- It is obviously that primary database, logical and physical standby database all need to have this log file being set up. Primary use it to archive log files and ship to standby. Standby use it to receive data from archived log and apply to database.
3. Standby redo logs --- In the document, it says A standby redo log is similar to an online redo log, except that a standby redo log is used to store redo data received from another database. A standby redo log is required if you want to implement: The maximum protection and maximum availability levels of data protection and Real-time apply as well as Cascaded destinations. So it seems that this standby redo log only should be set up on standby database, not on primary database. Am my understanding correct? Because I review current redo log settings on my environment, I have found that Standby redo log directory and files have been set up on both primary and standby databases. I would like to get more information and education from experts. What is the best setting or structure on primary and standby database?

FZheng:
Thanks for your input. It is clear that we need 3 type of redo logs on both databases. You answer my question.
But I have another one. In oracle ducument, it says If you have configured a standby redo log on one or more standby databases in the configuration, ensure the size of the current standby redo log file on each standby database exactly matches the size of the current online redo log file on the primary database. It says: At log switch time, if there are no available standby redo log files that match the size of the new current online redo log file on the primary database. The primary database will shut down
My current one data gurard envirnment setting is: On primary DB, online redo log group size is 512M and standby redo log group size is 500M. On the standby DB, online redo log group size is 500M and standby redo log group size is 750M.
This was setup by someone I don't know. Is this setting OK? or I should change Standby Redo Log on standby DB to 512M to exactly meatch with redo log size on primary?
Edited by: 853153 on Jun 22, 2011 9:42 AM

Online redo logs vs backup

Below quoted sentence is from Oracle documentation
"Online redo logs, unlike archived logs, should never be backed up. The chief danger
associated by having backups of online redo logs is that you may accidentally restore
those backups without meaning to, and corrupt your database"
Can any one explain , how the database will be corrupted if we backup online redo logs. I am having a hard time to understand this quote
thanks for your help
shajan

Redo log file contents is very dynamic. It changes minute after minute, so a backup is useless if you try to do it online. (In fact there is no command to perform such backup).
Let's suppose you shutdown (normal, immediate or transactional) The contents of the redo log files become useless as the checkpoint process has already taken place, so it is enough to have a copy of all of the consistent datafiles to have the last applied transaccion.
In a recovery scenario with archivelog it is important to keep all of the requiered archivelog files plus all of the online redo log files.
In case of a missing logfile it is useless to have a backup of it. If you ever had one, and you tried to restore it, an error would arise, warning you that the contents of the logfile is inconsistent with the expected scn. The only way you can succeed is to have them multiplexed and have them on different paths, just to reduce to probability of loosing all of the members of a group.
rman does not perform backup of redo log files. Classical theory of backup/recovery states that during a hot backup it must be backed up the archive log files, not the redo log files.

Online redo logs fill-up due to long running SCM processes

DB2 v9.7
AIX v6.1 P570
Running Standard SAP Code
Going live with SCM system running SNP/DP GATP how can we avoid having our online redo logs fill-up due to long running processes (i.e., CTM. Process Chains, BOP, DP Runs) Need to know SAP Best Practice regarding this -
Per our developers, BOP jobs performs commit when everything is processed and update table in one go at end, Hence not possible to perform commit regularly. Actually they will have to run BOP for 3200 material with 98000 sales order items.
But after just running BOP for 40 material with 22000 sales orders line items we are getting DBIF_RSQL_SQL_ERROR + CX_SY_OPEN_SQL_DB dumps
Any assistance on this would be helpful...
Thanks -

Fred
Check OSS notes for this error. The BOP compponent has a steady stream of corrections developed by SAP especially in older releases.
Also make sure your Livecache Build is consistent with SCM Release/ Patch level.
Rishi Menon

Why the time of the online redo logs doesn't change?

Oracle 11.1.0.7 on windows 2008.I find the time of the online redo logs doesn't change since Jan 18 when I had restarted database,and the time of some datafiles doesn't change either.the database is always online and changes are wrriting to the files, I don't know how this happened?
would anyone help me? thank you.

ROCK wrote:
I found some datafiles have the latest date,but the other not. They all have write/read operations on them.
and the switching of the redo logs doesn't change the timestamps of the logfiles since Jan.18 when I had restarted the database. this situation does not appear on the early 8.1.7 database on windows 2000
Does this situation normal?Hi,
Why dont you post the output of the query you are using such as
select group#, first_time, status from v$log;
select name, last_time, status from v$datafile;
select name, CHECKPOINT_TIME, status from v$datafile_header;Time stamp wont change for offline and may be for temp tablespace.
Regards
Anurag

Regarding Online Redo log backup

Dear all,
I am running "Whole database online + Redo log backup" in production server which running successfully with return code 0000.
Is this backup takes online redo log file also?????? because in backup log i didn't see any directory like .../../orilog A, .../../orilog B etc which contains online redo log file.
Without this online redo log backup i don't thing we can do point to point recovery.
I am beginner for oracle so please clear this doubt.
thanks,
Tarun

Tarun verma wrote:
> Oraarch having offline redo log file and saparch having redo log backup log file, but both of this related to offline redo log backup.
>
> I want to know about online redolog backup??? Is it possible to take or not??? and how we can check online redo log backup is running or not??
You have offline redo log files in 'oraarch' --> this means that 'online redo logs' are getting backed up into 'oraarch'.
sql > archive log list
http://www.adp-gmbh.ch/ora/sqlplus/archive_log.html
Above command tells whether the logging is ON or not. If it is ON, then online logs will be generated w.r.t. every sap work and as soon as the online logs gets filled up - it gets backed up into 'oraarch' - to accommodate more logging with time.
Thanks

Open database if an active online redo log is missing

Hi,
Sorry for the rather long post, but I specified all the steps I performed and couldn't make it shorter :-(
I need an advice on how to open the database if an active online redo log is missing.
For test purposes I intentionally performed a shutdown abort when the redo log group 1 was in active state and then renamed its only member (REDO01.LOG) so that the database couldn't perform crash recovery using it. Then upon startup I obviously got the message:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: 'H:\ORADATA\TESTDB\REDO01.LOG'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.Ok, so I checked the state of the logs:
{noformat}
SQL>SELECT a.GROUP#, first_change#, SEQUENCE#, a.status, SUBSTR(b.MEMBER, 1, 40) MEMBER, b.status mem_status, a.archived
2    FROM v$log a, v$logfile b
3   WHERE a.GROUP# = b.GROUP#
4 ORDER BY a.GROUP#, b.MEMBER;
GROUP# FIRST_CHANGE# SEQUENCE# STATUS           MEMBER                         MEM_STA ARC
     1        592134         29 ACTIVE           H:\ORADATA\TESTDB\REDO01.LOG           YES
     2        592268         30 CURRENT          C:\ORADATA\TESTDB\REDO02.LOG           NO
     3        592129         28 ACTIVE           C:\ORADATA\TESTDB\REDO03.LOG           YES
{noformat}Since opening the database to perform a log switch and thus change the status of the redo log group 1 from ACTIVE to INACTIVE to recreate the member isn't possible, I performed database recovery.
SQL>recover database until cancel;
ORA-00279: change 592129 generated at 02/04/2009 10:31:15 needed for thread 1
ORA-00289: suggestion : C:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\TESTDB\ARCHIVELOG\2009_02_04\O1_MF_1_28_%U_.ARC
ORA-00280: change 592129 for thread 1 is in sequence #28
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00279: change 592134 generated at 02/04/2009 10:31:28 needed for thread 1
ORA-00289: suggestion : C:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\TESTDB\ARCHIVELOG\2009_02_04\O1_MF_1_29_%U_.ARC
ORA-00280: change 592134 for thread 1 is in sequence #29
ORA-00278: log file 'C:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\TESTDB\ARCHIVELOG\2009_02_04\O1_MF_1_28_4RLR3JS9_.ARC' no longer needed for this rec
overy
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
'C:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\TESTDB\ARCHIVELOG\2009_02_04\O1_MF_1_29_4RLR4MF3_.ARC'
ORA-00279: change 592268 generated at 02/04/2009 10:32:03 needed for thread 1
ORA-00289: suggestion : C:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\TESTDB\ARCHIVELOG\2009_02_04\O1_MF_1_30_%U_.ARC
ORA-00280: change 592268 for thread 1 is in sequence #30
ORA-00278: log file 'C:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\TESTDB\ARCHIVELOG\2009_02_04\O1_MF_1_29_4RLR4MF3_.ARC' no longer needed for this rec
overy
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
'C:\ORADATA\TESTDB\REDO02.LOG'
Log applied.
Media recovery complete.
SQL>So for log sequence #28 I accepted the proposed archived redo log in the FRA, for sequence #29 (that's the online redo log that is missing!) I manually specified its archived copy, and for sequence #30 I specified the CURRENT online redo log. And as it seems the media recovery was successful.
Next I tried to open the database but again got the error:
SQL>alter database open noresetlogs;
alter database open noresetlogs
ERROR at line 1:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: 'H:\ORADATA\TESTDB\REDO01.LOG'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
The status of the log groups and its members is exactly as it was in the first query I wrote above, i.e. the redo log group 1 is still ACTIVE, so it's needed for crash recovery (which I had already done manually if I understand correctly how Oracle works!). I also checked if the datafiles are inconsistent (described in metalink doc id 1015544.102):
SQL>SELECT DISTINCT CHECKPOINT_CHANGE#, FUZZY FROM V$DATAFILE_HEADER;
CHECKPOINT_CHANGE# FUZ
            592269 NOSo, everything seems ok as far as datafile consistency is concerned.
My question is: how can I rename/drop/clear/whatever the member of redo log group 1 to open the database?
I tried to rename the log file member, to add another member to it, to open the database with resetlogs, to clear the logfile group 1, but all without success:
1)
SQL>alter database clear logfile group 1;
alter database clear logfile group 1
ERROR at line 1:
ORA-01624: log 1 needed for crash recovery of instance testdb (thread 1)
ORA-00312: online log 1 thread 1: 'H:\ORADATA\TESTDB\REDO01.LOG'
2)
SQL>alter database open resetlogs;
alter database open resetlogs
ERROR at line 1:
ORA-01139: RESETLOGS option only valid after an incomplete database recovery
3)
SQL>alter database rename file 'H:\ORADATA\TESTDB\REDO01.LOG' to 'C:\ORADATA\TESTDB\REDO01.LOG';
alter database rename file 'H:\ORADATA\TESTDB\REDO01.LOG' to 'C:\ORADATA\TESTDB\REDO01.LOG'
ERROR at line 1:
ORA-01511: error in renaming log/data files
ORA-01512: error renaming log file H:\ORADATA\TESTDB\REDO01.LOG - new file C:\ORADATA\TESTDB\REDO01.LOG not found
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
4)
SQL>alter database add logfile member 'C:\ORADATA\TESTDB\REDO01.LOG' to group 1;
alter database add logfile member 'C:\ORADATA\TESTDB\REDO01.LOG' to group 1
ERROR at line 1:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: 'H:\ORADATA\TESTDB\REDO01.LOG'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.Sorry again for the long post and thank you in advance for any suggestion.
Regards,
Jure

You could check if the recovery was complete by (re)creating the controlfile with the resetlogs option.
<CREATE CONTROLFILE REUSE DATABASE define_db_name RESETLOGS NOARCHIVELOG
...>Thanks for the hint. If possible, could you only check if the steps I'm going to perform are ok.
I did an "alter database backup controlfile to trace;" and then extracted the create controlfile definition part. So in essence I should run the following statements:
CREATE CONTROLFILE REUSE DATABASE "TESTDB" RESETLOGS ARCHIVELOG
    MAXLOGFILES 16
    MAXLOGMEMBERS 3
    MAXDATAFILES 100
    MAXINSTANCES 8
    MAXLOGHISTORY 292
LOGFILE
GROUP 1 'C:\ORADATA\TESTDB\REDO01.LOG' SIZE 20M,
GROUP 2 'C:\ORADATA\TESTDB\REDO02.LOG' SIZE 20M,
GROUP 3 'C:\ORADATA\TESTDB\REDO03.LOG' SIZE 20M
-- STANDBY LOGFILE
DATAFILE
'C:\ORACLE\PRODUCT\10.2.0\ORADATA\TESTDB\SYSTEM01.DBF',
'C:\ORACLE\PRODUCT\10.2.0\ORADATA\TESTDB\UNDOTBS01.DBF',
'C:\ORACLE\PRODUCT\10.2.0\ORADATA\TESTDB\SYSAUX01.DBF',
'C:\ORACLE\PRODUCT\10.2.0\ORADATA\TESTDB\USERS01.DBF'
CHARACTER SET EE8MSWIN1250
ALTER DATABASE OPEN RESETLOGS;
ALTER TABLESPACE TEMP ADD TEMPFILE 'C:\ORACLE\PRODUCT\10.2.0\ORADATA\TESTDB\TEMP01.DBF' REUSE;Is that correct?
About the RMAN backups: Wouldn't a 'CATALOG RECOVERY AREA' populate the controlfile with backup information again (I'm not using a recovery catalog in this case)?
Thanks for the help!
Regards,
Jure

Accidently Deleted Online Redo Log Files

Dear friends
Just to give a try, I deleted online redo log files from the disk after clearn shutdown (In Test Environment Not A Production Database), then i started the dabase, I know we need atleast two online redo files for database to work properly. now my point of question is how can i create new online redo files ?
I have 2 redo logfile groups each with one member. In group 2 i have added new member for the deleted one using add logfile member ....... to group 2. but when i try todo the same to add logfile member to group1 I am not abale to do so. because its saying that this is the current logfile member. then I tried manual log switching to use next logfile member but database is not allowing as the database is just mounted not opened. plsease if any body helps me out to sort out this problem it will be a great help.
Anandkumar S.M
Oracle DBA
rC6Exv3

hello ur instruction u have is some what bit rite. but i was not able to solve the problem
finally i solved the problem with these commands after database is mounted
recover database until cancel Enter
then I select the cancel option when it provide the user with the options
after cancelling the recover i issued the following command
alter database open resetlogs;
this method sorted out my problem
anyway very very thanks for ur root hints from where i got the Idea to recover online redo logfiles
Thank u very much

When occurs crash recovery,why use active online redo log not archived log?

If current redo log had archived, but it's still 'ACTIVE'. As we all know, archived log is just an archived copy of the current redo log which is still 'ACTIVE', they have the same data. But why use active online redo log not archived log for crash recovery?(I think, if crash recovery can use archived log, then whether the online redo log is 'ACTIVE' or not, it can be overwritten)
Quote:
Re: v$log : How redo log file can have a status ACTIVE and be already archived?
Hemant K Chitale
If your instance crashes, Oracle attempts Instance Recovery -- reading from the Online Redo Logs. It doesn't need ArchiveLogs for Instance Recovery.
TanelPoder
Whether the log is already archived or not doesn't matter here, when the instance crashes, Oracle needs some blocks from that redolog. Archivelog is just an archived copy of the redolog, so you could use either the online or achive log for the recovery, it's the same data in there (Oracle reads the log/archivelog file header when it tries to use it for recovery and validates whether it contains the changes (RBA range) in it what it needs).

Aman.... wrote:
John,
Are you sure that the instance recovery (not the media recovery) would be using the archived redo logs? Since the only thing that would be lost is the isntance, there wouldn't be any archived redo log generated from the Current redo log and the previous archived redo logs, would be already checkpointed to the data file, IMHO archived redo logs won't participate in the instance recovery process. Yep, shall watch the video but tomorrow .
Regards
Aman....
That's what I said. Or meant to say. If Oracle used archivelogs for instance recovery, it would not be possible to recover in noarchive log mode. So recovery relies exclusively on the online log.
Sorry I wasted your time, I'll try to be less ambiguous in future

Recover when Online Redo Log lost.

Hi,all.
How do I recover the db while all the online redo log files were lost.
The database is running in archive mode and all the archived redo log files were saved well.
But since last hot backup,I have done some table inserting with nologging.
Now the database can not be opened.
Who can tell me how to recover the db to the recent state.
I remember the db was shutdown immediate.
(Do it make any difference to online redo log file between shutdown immediate and abort?)
Thanks.
wy.

I find out if I shutdown immediate and remove all the redo log files,I can recover the database as below:
SQL> startup
ORACLE instance started.
Total System Global Area 109164572 bytes
Fixed Size 75804 bytes
Variable Size 59498496 bytes
Database Buffers 49512448 bytes
Redo Buffers 77824 bytes
Database mounted.
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: 'D:\ORACLE\ORADATA\ORCL\REDO03.LOG'
SQL> recover database until cancel
Media recovery complete.
SQL> alter database open resetlogs;
Database altered.
but if I shutdown abort,I can not recover the database.
SQL> startup
ORACLE instance started.
Total System Global Area 109164572 bytes
Fixed Size 75804 bytes
Variable Size 59498496 bytes
Database Buffers 49512448 bytes
Redo Buffers 77824 bytes
Database mounted.
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: 'D:\ORACLE\ORADATA\ORCL\REDO03.LOG'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) O5M3UR2;5=V86(5DND<~!#
SQL> recover database until cancel
ORA-00279: change 690879 generated at 08/09/2004 16:34:04 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\ORCL\ARCHIVE\ORCLT001S00002.ARC
ORA-00280: change 690879 for thread 1 is in sequence #2
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
auto
ORA-00279: change 690963 generated at 08/09/2004 16:34:08 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\ORCL\ARCHIVE\ORCLT001S00003.ARC
ORA-00280: change 690963 for thread 1 is in sequence #3
ORA-00278: log file 'D:\ORACLE\ORADATA\ORCL\ARCHIVE\ORCLT001S00002.ARC' no
longer needed for this recovery
ORA-00308: cannot open archived log
'D:\ORACLE\ORADATA\ORCL\ARCHIVE\ORCLT001S00003.ARC'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) O5M3UR2;5=V86(5DND<~!#
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: 'D:\ORACLE\ORADATA\ORCL\SYSTEM01.DBF'
SQL> recover database until cancel
ORA-00279: change 690963 generated at 08/09/2004 16:34:08 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\ORCL\ARCHIVE\ORCLT001S00003.ARC
ORA-00280: change 690963 for thread 1 is in sequence #3
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
CANCEL
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: 'D:\ORACLE\ORADATA\ORCL\SYSTEM01.DBF'
ORA-01112: media recovery not started
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: 'D:\ORACLE\ORADATA\ORCL\SYSTEM01.DBF'
So How to recover the database when the db shutdown abort and all the online redo log were lost?

How to damage online redo log for simulation

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