Creation of New Online Redolog File.

Hi,
We are working in SAP 7.0 environment.
My Problem is related to Basis.
In our BI Development system we had schedule AllOffline backup through Brtools.
From last few months backup is geeting finished with warning & the warning is,
BR0335W Status of online redo log file /oracle/BID/mirrlogB/log_g12m2.dbf is INVALID
BR0274W File '/oracle/BID/mirrlogB/log_g12m2.dbf' not found
BR0335W Status of online redo log file /oracle/BID/mirrlogB/log_g14m2.dbf is INVALID
BR0274W File '/oracle/BID/mirrlogB/log_g14m2.dbf' not found.
When i had checked at the O.S level i found that at location /oracle/BID/mirrlogB there is no such file is found.
So i checked in other system at same location files are available.
I think somebody had deleted the respective files; because before the same backup was getting finished successfully.
Now what can i do to remove this warning.
Is it possible to add new file at the same location with same name???????????
please guide me.
Thanks & Regards,
Aasmi.

... two log files are exist namely '/oracle/BID/origlogB' & '/oracle/BID/origlogB'.
That's impossible. Probably names are like
'/oracle/BID/origlogB/log_g1m1.dbf' & '/oracle/BID/origlogB/log_g3m1.dbf'
Adding new logfiles or logfile groups will not cause any problems, but take care to keep names different from the names of existing files!
You shouldn't create single logfiles, but logfile groups, with two members, one in origlog, one in mirrlog. The two members aren't copies, but they are used by Oracle in exactly the same way, just in case one of the is lost. That's because they are crucial for keeping data integrity.
Explaining details can't be the objective of a forum thread. I suggest thoroughly studying the manuals.
regards
Edited by: Joe Bo. on Jun 23, 2009 8:29 AM

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Size of an online redolog file member

How to reduce the size of an online redolog file member

You can add a new logfile, then switch logfile, then drop the old one.
You cannot have different members sizes in the same group.
Regards
Laurent Schneider
OCM-DBA

Resize online redolog files, make RMAN obsolute backups as usable

Dear Guru's,
I have following doubts, please clarify me on the same. thanks in advance
1. why can not we resize online redolog files instead of re-creating the same with large size and remove the older onces.
2. How can we make RMAN obsolute backups as usable ?
Thanks.

vasuoracledba wrote:
Hi Aman,
Thanks for replay...
Regarding RMAN, plz look into below issue.
I configured RMAN backup recovery window of 15 days. after 15 days the backupsets which were older then 15 days are obsolute. now i have to restore the backup of 15 days older(obsolute backupsets) backupsets to the database. but when i do restore it defaulty takes latest backupsets other then obsolute onces.
how do i restore older(obsolute backupsets) backupsets to the database?
If i used the CHANGE cmd, how to do that.
RMAN> change backupset tag weekly_backup_20052013_02:45 _______________
do i make latest backupsets unavaliable to restore the older once....
RMAN> change backupset tag weekly_backup_20062013_02:00;
Thanks in advance...........
Obsolete backups are always usable, until you delete them with DELETE OBSOLETE.
If you want to restore from a backup other than the latest, use an until clause:
run {set until time = 'sysdate - 15';
restore database;}

Online Redologs file

Hi,
Aftr oracle patch upgradation my oracle 10g Database online redolog files are genrated with ROOT:SYSTEm(group&OWNER) inplace of ora<SID>
Please let me know the possible reson and solution of it.
Thanks
Presu

Hi,
Its looking like permission issues (s-bit issue) with database executables like BRARCHIVE, BRBACKUP and others.
Please read the following SAP Notes and do the needful.
[ Note 113747 - Permissions for DBA tools BR*Tools and SAPDBA|https://service.sap.com/sap/support/notes/113747]
[Note 651351 - BR tools on UNIX: Error due to executable permissions|https://service.sap.com/sap/support/notes/651351]
Regards,
Bhavik G. Shroff

Change the Online redolog file

Hi Experts,
Please help me.
For SAP Recommondation we want change Online Redolog file.
How can to change Online Redolog file system .
Change minimal size of online redo log file from 20971520 to 63000000
Please explain what is the procedure.
Regards
S.Prasad

review Note 79341 - Checkpoint not complete available at https://service.sap.com/~form/handler?_APP=01100107900000000342&_EVENT=REDIR&_NNUM=79341&_NLANG=E
check for section 3.
HTH

Online Redolog file/group creation date

How to check Online Redolog group/file creation date.

Mano wrote:
How to check Online Redolog group/file creation date.Given that the online redo logs are constantly re-used, I'd have to ask what problem do you think will be solved by knowing the creation date . . .
Personally, I can't think of a more useless piece of information, so perhaps you'd get better information if you told us the real problem you are trying to solve.

Post V 8.2 upgrade will not open without creation of new blank library file

Hello to all.
Any suggestions with regard to the following ?
Since upgrading to V8.2, iTunes will only open after having removed the library file, and letting the application create a fresh new library file, then reimporting all media files.
This must be done EVERY TIME iTunes is restarted; otherwise the application just refuses to open... So yes, I've been leaving iTunes running!
I took the TIME to embed all album artwork... I have no idea if that might be causing the problem (in the case of non-popular music, the iTunes store is so far not capable of corrctly matching artwork to album.
This is a very large but simple and well managed library (100% music, all in Apple Lossless); all media files are managed by iTunes and are in one location.
Any suggestions greatly appreciated!
Rex

I'm answering my own post here for the benefit of those who may be having the same issues (see previous post).
1) Get comfortable and start by reading this a couple times:
http://www.ilounge.com/index.php/articles/comments/moving-your-itunes-library-to -a-new-hard-drive
2)Embed all artwork; I did it the hard way, but now know it can be done via a script from Doug (scorll down):
http://dougscripts.com/itunes/scripts/scripts13.php
3)Ask iTunes to consolidate your library to a location other than within the iTunes folder (Do not do this via the back door! See iLounge article in first link).
4)Completely uninstall iTunes as instructed here
http://support.apple.com/kb/HT1224
Do exactly as instructed, making sure your media files have FIRST been moved via consolidation to a location outside all iTunes folders. Finish with a Spotlight search for "iTunes"... Get rid of everything including the icon in the dock.
Optional step: At this point you may want to verify the master drive and possibly repair permissions using Disk Utilities... I did.(To do this, start from the original OS install CD/DVDs... Insert disk, restart while holding down "C"; once booted, go to the Edit or File menu at top of screen and select "Disk Utility", first aid, etc).
5)Download a fresh copy of the latest version of iTunes and install it (V8.2.1 in my case).
6)Once iTunes is running, set the location of media files in iTunes advanced prefs to correspond to where your media is physically stored (see iLounge article in link above).
7)Go through and reset all iTunes prefs (they will have been tossed out with the uninstall).
8)Import media from within the iTunes user interface (via the pull down menu at the top left of the iTunes screen... See iLounge article). If your library is well sorted, you can do it all in one go, by simply selecting the main folder containing all media files (verify by importing just the work of one artist for starters). Large, high-res libraries will take a while... The final phase of the process is the automatic loading of all embedded artwork.
That's it.
From here on out, every time you import new media, manually embed the art work as follows :
1)Once imported, start one of the album tracks playing so the artwork will appear (see step 3).
2)Select all the tracks in the album to which you want to add the iTunes artwork.
3)In the bottom left-hand corner click on ’show/hide artwork’
4)Right-click on the artwork image that is displayed and select ‘copy’
5)Now right-click on the tracks you’ve highlighted and select ‘Get info’
6)In the pop-up box that right-click in the artwork field and select ‘paste’
Done.
Peace,
Rex

Best practice online redologs redundant

Oracle dbs on Unix without ASM
Few DBs have only single oracle filesystem available on unix box & have only one online redolog file available, wondering what would be the best practice to redundant them?
I know if i have multiple oracle filesystems , i can spread them there. but with only one filesystem, i can create one more redolog and put on the same filesystem.

All right here is my researchwork on this topic, make me right if i miss something, its not RAC, just single instance dbs.
Advantages
Oracle recommends that you mutliplex the online redo log files, store members on separate disk drives, Even if all
copies of the redo log are on the same disk, the redundancy can help protect against I/O errors, file corruption, and
so on.
Disadvantages
Multiplex redo log files. the database must increase the amount of I/O that it performs. Depending on your
configuration, this may impact overall database performance.
Each member in a group must be exactly the same size.
select GROUP#, MEMBER from v$logfile;
select GROUP#, MEMBERS, STATUS , BYTES from v$log;
ALTER DATABASE ADD LOGFILE MEMBER '/oracle/dbs/log2b.rdo' TO GROUP 2;
alter system switch logfile; (few times to make sure all ok)
Backout plan
alter database drop logfile member '/wmbrktst/oradata/wmbrktst/redo01.log';

DB copy- re-using online redo files of target database

Hello again,
One question regarding DB copy from PRD to TST database (both are existing and running DBs). Can it cause problems when you don't remove online redolog files on TST database (e.g. log_g11m1.dbf...) during the copy ? Can those files be reused when stating 'alter database open resetlogs'? or could be any redolog files (even from totally other database) be reused - with same size, of course.
If you don't delete it , can it cause an error ORA-00305: log 4 of thread 1 inconsistent; belongs to another database ?
I am bit wondering, because I don't see any reuse in control trace file:
LOGFILE
GROUP 1 (
'/oracle/XXX/origlogA/log_g11m1.dbf',
'/oracle/XXX/mirrlogA/log_g11m2.dbf'
) SIZE 250M,
GROUP 2 (
'/oracle/XXX/origlogB/log_g12m1.dbf',
'/oracle/XXX/mirrlogB/log_g12m2.dbf'
) SIZE 250M,
GROUP 3 (
'/oracle/XXX/origlogA/log_g13m1.dbf',
'/oracle/XXX/mirrlogA/log_g13m2.dbf'
) SIZE 250M,
GROUP 4 (
'/oracle/XXX/origlogB/log_g14m1.dbf',
'/oracle/XXX/mirrlogB/log_g14m2.dbf'
) SIZE 250M
Thx a lot for explanations in advance!

Hello,
I dont want to share them. I just meant, I have TST database running and I want to replace it's content from PRD database. So I delete all datafiles and do restore. BUT I do not delete online redolog files, I keep the files . Can these files be reused once I restore datafiles from PRD to TST?

At the time of copying online redologs to STANDBY site.....

hai..
At the time of configureing dataguard manually(without rman) do i need to copy the online redologs to standby site along with *.dbf files and standby controlfile after clena shutdown? bcaz some procdeures guide me to copy all files with online redolog files to the stanndby environment.but some procedures guide me to only copy the *.dbf files to the standby environment along with init.ora,standby controlfile from the primary site.whcih one is correct? and which one is better?
please guide me.

What is better is to use RMAN.
Why violate "best practice" guidelines.
RMAN knows what to copy and does it correctly.
Hint: If you don't copy the online redologs ... how will they be created? Magic rarely works.

Does creation of new xml file captures latest value?

HI All,
say for instance, if web port has been changed from 8000 to 80 and after this change xml file gets corrupted in apps tier...
Does creation of new xml file in apps tier captures latest value of web port 80 and all other latest changes made so far?
Thanks for your time...

HI All,
say for instance, if web port has been changed from
8000 to 80 and after this change xml file gets
corrupted in apps tier...
Does creation of new xml file in apps tier captures
latest value of web port 80 and all other latest
changes made so far?
Thanks for your time...If autoconfig is not run after the changes are made to the context file, and the file is lost then the changes are lost.

Restore hot online backup without redolog file

Dear
I had taken a online backup (begin / end tablespace) of all datafiles. Before end backup I had taken backup of current controlfile with O/S command.
Now, I want to restore this backup.
I have only :
datafiles (taken with begin / end backup)
controlfile (taken during begin / end backup)
Archive Log (from backup to up till now)
What steps I have to take for recovery with missing redolog files.
regards;

Thanks dears its worked
SQL> startup mount
ORACLE instance started.
Total System Global Area 289406976 bytes
Fixed Size 1248576 bytes
Variable Size 96469696 bytes
Database Buffers 184549376 bytes
Redo Buffers 7139328 bytes
Database mounted.
SQL> recover database until cancel using backup controlfile
ORA-00279: change 643381 generated at 03/26/2009 15:59:06 needed for thread 1
ORA-00289: suggestion : E:\ORACLE\ARCHIVE\ARC00008_0682335852.001
ORA-00280: change 643381 for thread 1 is in sequence #8
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
auto
ORA-00279: change 644479 generated at 03/26/2009 16:01:31 needed for thread 1
ORA-00289: suggestion : E:\ORACLE\ARCHIVE\ARC00009_0682335852.001
ORA-00280: change 644479 for thread 1 is in sequence #9
ORA-00278: log file 'E:\ORACLE\ARCHIVE\ARC00008_0682335852.001' no longer
needed for this recovery
ORA-00308: cannot open archived log 'E:\ORACLE\ARCHIVE\ARC00009_0682335852.001'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
SQL> alter database open;
alter database open
ERROR at line 1:
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
SQL> alter database open resetlogs;
*Database altered.
*-----------------------------

When are Redolog files reset to zero size? Manual reset possible?

As far as I know redolog files contain all stuff which is changed during operation of an Oracle database.
However I wonder if there are events when these files are AUTOMATICALLY reset to zero.
I guess it is when I do a full offline backup.
Is this correct?
Are there any other events when this happens automatically ?
How can I manually reset/initialize Redolog files to an empty state?
Peter

What did you mean empty redo logfile?
if you mean zero size on redolog files....
We can not reset redo log files to empty (zero).
I guess it is when I do a full offline backup.That mean your database offline... no operation, so no redo log generate. but not mean you can make redo log empty anyway...
If you mean redo log file no need for instance recovery.
redo log groups have "INACTIVE" status -> is no longer needed for instance recovery. It may be in use for media recovery. It might or might not be archived.
check from v$log
UNUSED - Online redo log has never been written to. This is the state of a redo log that was just added, or just after a RESETLOGS, when it is not the current redo log.
CURRENT - Current redo log. This implies that the redo log is active. The redo log could be open or closed.
ACTIVE - Log is active but is not the current log. It is needed for crash recovery. It may be in use for block recovery. It may or may not be archived.
CLEARING - Log is being re-created as an empty log after an ALTER DATABASE CLEAR LOGFILE statement. After the log is cleared, the status changes to UNUSED.
CLEARING_CURRENT - Current log is being cleared of a closed thread. The log can stay in this status if there is some failure in the switch such as an I/O error writing the new log header.
INACTIVE - Log is no longer needed for instance recovery. It may be in use for media recovery. It might or might not be archived.;)

Increase redolog file size - Merits and Demerits

Hi
Currently, we are in 9.2.0.7.0 oralce version and having redolog file sizes (Mirrlog and origlog) of 100MB.
Now we are planning to increase the size to 200 MB so that we could reduce the number of archive log files.
Can you please let me know what would be the demerits of bigger size in redolog files?
And also let me know the step by step process how to increase the size of redolog files?
Thank you

> I understand what you are saying but in our situation our backup policy is one time online backup and one time offline backup in a week.....Online backup is on Thu and Offline backup is on Sunday.......
>
> In case of system crash if needed we would need to apply archive log files; If we have lesser number of archive logs; recover database would be faster.......correct me if am wrong.
You are wrong.
Ok, let's see an example:
You took your backup on sunday midnight and your DB needs recovery on wednesday.
Meanwhile you created say, 800 M worth of redolog data per day.
That sums up to (monday, tuesday, wednesday) 3x800 M = 2400 M that need to be recovered.
Going with your current setup (100 M redolog size) the largest archivelog file can be 100 M, makes 24 files to restore and recover.
After changing the redologsize to, say 200 M, you only have 12 files to restore and recover.
But know what? It's still 2400 M of data.
Since you will likely not put every archivelog file to its own tape, but rather change the tape each day (just an assumption) or maybe don't use manually operated tapes at all, the little latency overhead in handling tapes doesn't count in to your overall recovery time.
All in all you still need to feed the same amount of data to the recovery process.
Apart from this:
if you're discussing short recovery times, than you'd never perform just two data backups a week.
You'd make online backups every day - maybe incremental ones.
You' d use the flashback recovery area.
An additional thing often overlooked: in many cases the ultimate performance killer for a restore/recovery scenario is not the technology in use.
It's that when the case is there, the DBA is not sure anymore, what do to.
He wonders:
Where the good backups are.
How to get them back from the 3rd party backup tool.
How to check them.
Where to get a different storage system because the original one is broken.
How to figure out what needs recovery
How the tools work
By ensuring that you always master the theory and the how to of restore and recovery - that's how you make it quick and painless (and dataloss-less).
regards,
Lars

Who will update control file when renaming a redolog file

Hi when we rename a redolog file in mount state of database using the following command
ALTER DATABASE
RENAME FILE '/diska/logs/log1a.rdo', '/diska/logs/log2a.rdo'
TO '/diskc/logs/log1c.rdo', '/diskc/logs/log2c.rdo';
how the new location and new name of redo log files will be updated to control file and who will update that inforamtion
thanks in advance.

Where did you get this?
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Creation of New Online Redolog File.

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