Archivelog Mode Deleting archive files

Hey,
I have been reading about archivelog mode for a while and understand the concept and how it works. The one thing that is still alluding me is the removal/deleting of old archivelog files and how long I need to keep the files.
I hear people saying "backup your archive files", how long do I need to keep the backed up archive files?
What this sounds like to me is "you better keep every archive file ever created by your database in order to restore". This sounds silly to me but thats how I am interpreting this. Can someone please help me understand this a bit better?
Thank

Archive logs are normally backed up when a database backup is done. Some shops might backup archive logs more or less frequently. You need to keep the backuped archive logs for as long a necessary to meet the recovery policies set forth by the business.
For example, for some database that I manage the business decision is to retain backups for an entire year. Other database have a smaller time frame of 2 to 6 months and some are only a week. So you can see that I do not keep every archive log ever created, I just keep the ones necessary to fulfil the recovery policies set by the business.

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AAUGHH!!! Accidentally deleted archive files on external hard drive!!

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Deleting archive files

Hi gurus,
we have been archived pi messages and we can see this with t-code al11. We would like to physically delete this files. How can we do that?
Kind Regards,
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Hi Peter,
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If you do not have administrative privileges. You need to write scripts or batch files. If operating system in PI server is unix/linux use this link http://www.unix.com/shell-programming-scripting/24911-how-delete-files-unix-using-shell-script.html
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http://help.sap.com/saphelp_nwpi71/helpdata/en/44/556cb799c93677e10000000a114a6b/frameset.htm
https://wiki.sdn.sap.com/wiki/display/XI/SAP%20XI%20File%20Adapter%20OS%20Command%20Line%20Feature
Glimpse at OS Command: Yet Another Scenario
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regards
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Hi,
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http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/toc.htm
Oracle® Database Backup and Recovery Advanced User's Guide
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/toc.htm
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Dear Gurus
I want to report a mishap that happened in one of our system.
I made one of the data files x01.dbf offline(the only datafile for that tablespace say X )
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Hi again,
Dear GuruOh la, I'm not a guru, just an old oracle newwbie!
I did not understand what was that 7 error game :)Lesson learned: do not try to translate obscure French stuff :-)
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Manual delete archived log files

Because we don't have RMAN in our development server, I need to use manual operation to delete all archived logs. Is my procedure correct and safe?
SHUTDOWN IMMEDIATE
STARTUP MOUNT
ALTER DATABASE NOARCHIVELOG;
EXITRun OS command to manually delete archived log files:
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STARTUP OPENThanks!

linuxos wrote:
Oh I suppose RMAN need to be configured somthing before use. I tried it, and find no pre-requisite is required. Thanks!
If the archives are deleted manually in open mode, how can Oracle match the archived logs' retention policy? Does Oracle store the archived logs in data dictionary?While you can delete archivelogs manually any time you want, you should let rman manage them with appropriate rman commands, preferably in a script that you schedule for regular execution.
Some of your questions lead me to question if you understand that archivelogs are not actively open by the database, and they technically are not part of the database. They are simply a series of "offline" copies of the online redo logs. They are written to once, when an online redo is being archived, then they just sit there until needed for a recovery.

How do i delete archive log files manually?

My db is running in oracle 10.2.0.4. somehow, the RMAN command is not deleting archived backup files. I need to delete those files manually at os level. how do i find till which archivelog files are backed up through RMAN?

RMAN> connect target
connected to target database: INVENT (DBID=1001824944)
using target database control file instead of recovery catalog
RMAN> show all;
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP OFF; # default
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/ora/app/oracle/product/10.2.0/db_1/dbs/snapcf_INVENT.f'; # default
RMAN>
Here is the commands....
connect target;
run
allocate channel t1 device type disk format /target/ret/%U';
set command id to 'L0 Backup';
delete noprompt obsolete;
backup incremental level 0 as compressed backupset database;
release channel t1;
connect target;
run
allocate channel t1 device type disk format /target/ret/%U';
set command id to 'L1 Backup';
delete noprompt obsolete;
backup incremental level 1 as compressed backupset database;
release channel t1;
}

How to setup oracle database to archivelog mode and auto delete ?

Oracle 11g R2
- How to setup database to archive log mode and have oracle only save 24 hours of archive logs
and delete the rest. So at any given time I will have only 24 hours of archive log and not more.
So only 1 day of archive logs.
- Let me know the database parameters I need to setup to accomplish this.
- I don't want to use the RMAN
- I am not setting up the database to archive log mode for recovery purpose. I am setting up archive log mode
so we can use the log miner tool to dig up achives to see log activity for any performance & tuning.
Edited by: johnpau2013 on May 9, 2012 6:09 PM

johnpau2013 wrote:
Thanks everyone for there responses.
I need to rephrase and explain everyone as what I wanted to do exactly. This might help everyone understand and suggest me.
We have oracle database 11g r2. Its a test database. Nothing is critical. We use EXPDP utility to backup the entire database every night. Which is enough for us to recover incase something happens. Even if we loose some data. That's fine.
We are testing our web application on this oracle test database for performance & tuning.
One thing we have noticed is that the redo logs are switching very frequently. 50MB each log file and there are 5 logs. each log switches every 40 seconds. So we wanted to see what is getting written in this redo logs. We wanted to use the LOG MINER tool in OEM to read the logs. It needed our database to be setup in archive log mode. So the log miner can read the archive logs and show us the sql's within the archive logs.
Now when we setup the archive log mode on our database. By default the archive logs destination was set to flash recovery area ( may be oracle default archive log location is flash recovery area folder).
We have setup the db_recovery_file_dest_size to 100GB. Now within 2 days we have filled up the flash recovery area folder. Database was frozen. Then we realized that its because oracle couldn't write archive logs. Because it reached the 100GB. Then we physically deleted files in the flash recovery area folder. Thinking it would help us start the frozen oracle database. But it didn't . The we realized that we are doing something wrong. As Oracle does not know that at OS level we deleted the files. Then temporarily we changed the db_recovery_file_dest_size to 130GB and were able to start the oracle database. Later we turned OFF the archive log mode.
Being a rookie DBA we would have not read something properly.
Finally:
We wanted to know how to always keep only 1 day of archive logs (only for our performance tuning ) and not more than that. All we need this 1 day of archive logs is to use the log miner to read them. Backup is NOT our priority here. Only be able to read the archive logs from LOG MINER is PRIORITY.
Correct me if I am wrong.Okay, so its making much more sense now, thanks for explaining your requirement.
Database won't honor anything that you would do over the o/s without telling it. Your deletion of the archive log from the o/s location is NOT updated in the control file of the database and that's why, even when you had deleted the entire 100GB , from the db perspective, the space was still marked as used. This is the same which would happen even if you would increase the space from 100gb to whatever size as well. To delete the space, you would need to update the database's control file and that you can do from RMAN using its two commands , crosscheck backup following with deleted expired backup . The first command would find that which database backup files are NOT on the o/s which are shown in the control file and would mark all of them as expired. The second command would simply delete those expired files. This would update the control file and you would have your 100gb or whatever space, given back to you.
To keep the archive logs of just one day, set up that Retention Policy for RMAN to either number of copies using the Redundancy option(default and set to 1) or Recovery Window. I believe for you Redundancy would be a suitable choice but you can have a read and play around with it. Setting it up would mark the files as Obsoleted and finally, you can write a small RMAN script to delete those obsoleted files.
Now, what I don't understand is that why you want to keep on generating the archive logs just for the log miner? If you would have generated them once and figure out the reason for extensive redo generation(did you try increasing the redo log file size, 50mb seems to be smallish) , I don't think that there is any reason to keep on generating the archive logs still .
And last part, for your question asked about that whether we can use RMAN to put the db in the archive log and is it a backup tool, yes and yes.
HTH
Aman....

Non Archivelog Database- Undo Data files Deleted-How to Open Database ??

I am doing some test in Lab server.
Unforunately Undo Tablespace datafiles are deleted from the server.
Database is running in No archivelog Mode and I don't have any any type of Backup.
Last one week, i was doing only read only work with database. So Not really concern how much i will loose.
The biggest worry is How can I open the database with existing datafiles ????
Regards ,
Sumit
Edited by: Sumit2 on Aug 27, 2009 12:57 PM

If any active transaction or data needed by any of the session for rollback then it will be difficult to recover those transaction and your database data will be in inconsistent state. As you were doing only read only activity you can safely recover the database.
just comment undo tablespace and undomanagement parameters init.ora file and restart the database.
Once database is up create new undo tablespace and assigning it as default undo tablesapce tablespace.

Archivelog Mode Deleting archive files

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