If alert log is deleted, how to restore it?

Hi,
I want to know if Alert log is deleted, how to restore it?

RMAN does not backup the alertlog, only an OS filesystem backup does this. In 11g and higher there are 2 versions of the alertlog, the well-known textfile and now additionally a file in xml format. IF only the text version is lost, command line utility adrci can still access the xml file:
http://docs.oracle.com/cd/E11882_01/server.112/e22490/adrci.htm#BGBBBBEA

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Hi all
I have accidently deleted all log files and I don't have any backups
How can I restore and recover database?

My first instinct is to agree with what other have posted ... you are toast.
But then I realized that you posted wholly insufficient information from which to actually respond. Missing are:
1. Database version
2. Stand-alone or RAC?
3. Is there a standby database associated with the system?
4. Is there any form of replication associated with the system?
5. ASM or File System
6. Operating system
7. What are you trying to recover ... be very specific
8. Why are you trying to recover it ... again be very specific and include the appropriate part of the alert log
9. How did the data that was in the database get there ... again be very specific
10. List everything you have done to the database in an attempt to address the issue up to this moment.
And please please please push yourself away from the keyboard until you get a response. There may be nothing you can do ... but you could quite possibly make things worse.
Note to SB and $phinx19 ... think about it ... this is a forum with people from many countries, many different levels of experience, and often words are used incorrectly. This may not be what we assumed it to be. I've seen people try to recover a database when all they did was delete rows from a table. Let's get all the facts before we start smearing butter on it.

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Hello!
I have a question about job numbers in alert log file. Today one of our Oracle 10g R2 [10.2.0.4] RAC nodes crashed. After examining alert log file for one of the nodes I saw a lot of messages like:
Tue Jul 26 11:52:43 2011
Errors in file /u01/app/oracle/admin/zeme/bdump/zeme2_j002_28952.trc:
ORA-12012: error on auto execute of job *20627358*
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Errors in file /u01/app/oracle/admin/zeme/bdump/zeme2_j001_11018.trc:
ORA-12012: error on auto execute of job *20627357*
ORA-12705: Cannot access NLS data files or invalid environment specified
Tue Jul 26 11:52:43 2011
Errors in file /u01/app/oracle/admin/zeme/bdump/zeme2_j000_9684.trc:
ORA-12012: error on auto execute of job *20627342*
ORA-12705: Cannot access NLS data files or invalid environment specified
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How do I map number in alert log file to some "real" information (owner, statement executed, schedule)?
Marx.

Sorry for the delay
Try this to find the job :
select job, what from dba_jobs ;
How do I find NLS_LANG version?SQL> show parameter NLS_LANG
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NLS_LANG=_AMERICA.WE8ISO8859P1 ( correct )
NLS_LANG=AMERICA.WE8ISO8859P1 ( Incorrect )
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set NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P1
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export NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P1
mseberg
Edited by: mseberg on Jul 28, 2011 3:51 PM
Edited by: mseberg on Jul 29, 2011 4:05 AM

Seeking comments about managing Oracle's Alert log

Good morning,
Alert logs can often be very useful.
I am forming the opinion that it would probably be a good idea to keep a backup of the alert logs for, maybe, a 3 to 6 months sliding window.
I would like to know the views of the forum members on the subject of alert log backups, including how long the backups (if any) are kept. Actual practice on the subject in production environments is greatly appreciated.
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Hello Asif,
>
Yes , may be you need to open a SR in metalink and they may ask something old incident. For this reason you need to check the old alert log content. That's why I suggest to keep the alert log for production environment for 3/4 years.
>
I had not thought about someone asking for an incident that would be over a year old but, I can see that on occasion having the records might be useful.
>
Now a days storage are cheap so it's not that critical to store the alert log files.
>
I completely agree. I was more concerned about managing that many logs... on the other, they are just flat files, not that hard to manage.
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hi gurus...
i have problem on logical standby
by mistake standby log coming to logical standby has been deleted , now how to fill up the gap ???
ON STANDBY
SEQUENCE# FIRST_CHANGE# NEXT_CHANGE# APPLIED
228 674847 674872 YES
229 674872 674973 CURRENT
230 674973 674997 NO
231 674997 675023 NO
232 675023 675048 NO
233 675048 675109 NO
234 675109 675135 NO
235 675135 675160 NO
236 675160 675183 NO
237 675183 675208 NO
238 675208 675232 NO
239 675232 675257 NO
240 675257 675282 NO
241 675282 675382 NO
242 675382 675383 NO
243 675383 675650 NO
244 675650 675652 NO
245 675652 675670 NO
246 675670 675688 NO
247 675688 675791 NO
248 675791 678524 NO
archive log are shipping to standby location also and getting registered
ALERT LOG OF STANDBY
Fri May 7 12:25:36 2010
Primary database is in MAXIMUM PERFORMANCE mode
RFS[21]: Successfully opened standby log 5: '/u01/app/oracle/oradata/BEST/redo05.log'
Fri May 7 12:25:37 2010
RFS LogMiner: Registered logfile [u01/app/oracle/flash_recovery_area/BEST/archivelog/archBEST_248_1_715617824.dbf] to LogMiner session id [1]
but i dont have standby log after 229 sequence ...
ON PRIMARY
SYS@TEST AS SYSDBA> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /u01/app/oracle/flash_recovery_area/TEST/standlogOldest online log sequence 247
Next log sequence to archive 249
Current log sequence 249
what to do next to apply sequences and bring both in sync.
please help me ,,,,
Edited by: user12281508 on May 7, 2010 9:45 AM

thanks for response.
no its pure logical standby
i have tried to ftp the archive logs of primary to standby and applied manually
SYS@BEST AS SYSDBA> alter database register logfile '/u01/app/oracle/flash_recovery_area/BEST/archivelog/archBEST_230_1_715617824.dbf';
alter database register logfile '/u01/app/oracle/flash_recovery_area/BEST/archivelog/archBEST_230_1_715617824.dbf'
ERROR at line 1:
ORA-01289: cannot add duplicate logfile
SYS@BEST AS SYSDBA> alter database register logfile '/u01/app/home/archTEST_230_1_715617824.dbf';
alter database register logfile '/u01/app/home/archTEST_230_1_715617824.dbf'
ERROR at line 1:
ORA-01289: cannot add duplicate logfile
any other way ????

If alert log is deleted, how to restore it?

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