Recovering MaxDB instance after file corruption

Hello,
How can I recover MaxDB database from backup when one of datafiles was corrupted? I could drop this broken database, create new one and recover it. But is there any way to recover db without dropping it?
And one more thing I would like to understand.
AFAIK database instance consists of two major "parts". datafiles/logfiles and small set of files placed in sapdb/wrk directory (in case of standard SAP installation). What kind of information are kept in these files? What about definition of database users and DBM operators?
If I drop SAP database, create new one with the same name and users/DBM operators and recover data form backup, will this database be the same as "original" one? What are possible differences between these two databases?
Thank you for any help with solving my problems.
regards,
Konrad

Hi Markus,
Thanks for answer.
The problem is I cannot bring database in admin mode. I cannot even start problem service (server is Windows based):
Here's my knldiag:
2007-11-08 15:11:59                               --- Starting GMT 2007-11-08 15:11:59           7.5.0    Build 032-123-111-699
2007-11-08 15:12:12      0xB60 ERR 18159 VOLUMEIO Could not open volume 'd:sapdbTH4dataDISKD0001', rc = 2
2007-11-08 15:12:12      0xA24 ERR 20014 IOMan    Attach error on data volume 1: could not open volume
2007-11-08 15:12:12      0xA24 ERR 20017 Admin    RestartFilesystem failed with 'I/O error'
2007-11-08 15:12:12      0xA24 ERR 20010 Admin    ERROR 'disk_not_accessibl' CAUSED EMERGENCY SHUTDOWN
2007-11-08 15:12:13                               ___ Stopping GMT 2007-11-08 15:12:13           7.5.0    Build 032-123-111-699

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Recovering data when log files corrupt

I am interested to understand if you can easily salvage the data files if the log files corrupt for some reason. Thus far I cannot see how this can be easilly achieved as db_backup requires a working environment, and since the log files may have vanished, the LSN of the data files will be greater than of the last log - and therefore refuse to create the environment.
Ideally I guess, I am looking for a tool that can reset the LSN in place. It would be better to have access to your 100's of GB of data and accept a small amount of inconsistency or data loss than have nothing.
Thanks

Hi,
Resetting LSNs can be done using db_load -r lsn or using the lsn_reset() method, and it is done in place.
If your log files are corrupted, you would need to verify the database files (you can use the db_verify BDB utility or the verify() method). The actions you will further take depend on the result of verifying the database files:
- if they verify correctly then you just need to reset the LSNs and the file IDs in the databases and start with a fresh environment,
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Recover from currnet log file corruption in archive mode

Hi,
I am using oracle 10.2.0 on windows xp. my database is in archivelog mode. I am learning recovery. I take backup of database using
RMAN> backup database;
Starting backup at 03-SEP-09
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00004 name=D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\USERS01.DBF
input datafile fno=00001 name=D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\SYSTEM01.DBF
input datafile fno=00003 name=D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\SYSAUX01.DBF
input datafile fno=00002 name=D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\UNDOTBS01.DBF
channel ORA_DISK_1: starting piece 1 at 03-SEP-09which completed.
my current logfile and current sequence no is
SQL> select * from v$log;
    GROUP#    THREAD# SEQUENCE#      BYTES    MEMBERS ARC STATUS
FIRST_CHANGE# FIRST_TIM
         1          1         88   52428800          1 NO CURRENT
      4475270 01-SEP-09
         2          1         86   52428800          1 YES INACTIVE
      4426127 31-AUG-09
         3          1         87   52428800          1 YES INACTIVEThen i delete my only one redolog file in my current group. my instance crashes i want to recover now first i try
SQL> startup
ORACLE instance started.
Total System Global Area 289406976 bytes
Fixed Size                  1248576 bytes
Variable Size              92275392 bytes
Database Buffers          188743680 bytes
Redo Buffers                7139328 bytes
Database mounted.
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1:
'D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\REDO01.LOG'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
SQL> select open_mode from v$database;
OPEN_MODE
MOUNTED
SQL> recover database until cancel;
ORA-00279: change 4500421 generated at 09/03/2009 10:49:48 needed for thread 1
ORA-00289: suggestion : D:\1\ARC00088_0693601900.001
ORA-00280: change 4500421 for thread 1 is in sequence #88
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\PRODUCT\10.2.0\ORADATA\ORCL\SYSTEM01.DBF'
ORA-01112: media recovery not startedit doesn't work then i do
RMAN> restore database
2> ;
Starting restore at 03-SEP-09
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=156 devtype=DISK
channel ORA_DISK_1: starting datafile backupset restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
restoring datafile 00001 to D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\SYSTEM01.DBF
restoring datafile 00002 to D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\UNDOTBS01.DBF
restoring datafile 00003 to D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\SYSAUX01.DBF
restoring datafile 00004 to D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\USERS01.DBF
channel ORA_DISK_1: reading from backup piece D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\ORCL\BACKUPSET\2009_09_03
KP
channel ORA_DISK_1: restored backup piece 1
piece handle=D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\ORCL\BACKUPSET\2009_09_03\O1_MF_NNNDF_TAG20090903T104947_5
channel ORA_DISK_1: restore complete, elapsed time: 00:02:16
Finished restore at 03-SEP-09
RMAN>
RMAN> recover database until sequence 87;
Starting recover at 03-SEP-09
using channel ORA_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 09/03/2009 11:06:06
RMAN-06556: datafile 1 must be restored from backup older than scn 4444743It means i need an older backup but i have new backup how to restore or get my database up.
Thanks
umesh

Thanks for reply
i have this in my hand
RMAN> list backupset;
List of Backup Sets
===================
BS Key Type LV Size       Device Type Elapsed Time Completion Time
1       Full    1.38G      DISK        00:02:21     03-SEP-09
        BP Key: 1   Status: AVAILABLE Compressed: NO Tag: TAG20090903T104947
        Piece Name: D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\ORCL\BACKUPSET\2009_09_03\O1_MF_NNNDF_TAG20090903T104947_59YNHNSK_.BKP
List of Datafiles in backup set 1
File LV Type Ckp SCN    Ckp Time Name
1       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\SYSTEM01.DBF
2       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\UNDOTBS01.DBF
3       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\SYSAUX01.DBF
4       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\USERS01.DBF
BS Key Type LV Size       Device Type Elapsed Time Completion Time
2       Full    6.80M      DISK        00:00:03     03-SEP-09
        BP Key: 2   Status: AVAILABLE Compressed: NO Tag: TAG20090903T104947
        Piece Name: D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\ORCL\BACKUPSET\2009_09_03\O1_MF_NCSNF_TAG20090903T104947_59YNN8J9_.BKP
Control File Included: Ckp SCN: 4500486      Ckp time: 03-SEP-09
SPFILE Included: Modification time: 03-SEP-09
RMAN> restore database preview;
Starting restore at 03-SEP-09
using channel ORA_DISK_1
List of Backup Sets
===================
BS Key Type LV Size       Device Type Elapsed Time Completion Time
1       Full    1.38G      DISK        00:02:21     03-SEP-09
        BP Key: 1   Status: AVAILABLE Compressed: NO Tag: TAG20090903T104947
        Piece Name: D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\ORCL\BACKUPSET\2009_09_03\O1_MF_NNNDF_TAG20090903T104947_59YNHNSK_.BKP
List of Datafiles in backup set 1
File LV Type Ckp SCN    Ckp Time Name
1       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\SYSTEM01.DBF
2       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\UNDOTBS01.DBF
3       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\SYSAUX01.DBF
4       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\USERS01.DBF
archive logs generated after SCN 4500421 not found in repository
Media recovery start SCN is 4500421
Recovery must be done beyond SCN 4500421 to clear data files fuzziness
Finished restore at 03-SEP-09
RMAN> backup archivelog all ;
Starting backup at 03-SEP-09
using channel ORA_DISK_1
channel ORA_DISK_1: starting archive log backupset
channel ORA_DISK_1: specifying archive log(s) in backup set
input archive log thread=1 sequence=60 recid=3 stamp=694522772
input archive log thread=1 sequence=61 recid=4 stamp=694543115
input archive log thread=1 sequence=62 recid=5 stamp=694693173
input archive log thread=1 sequence=63 recid=6 stamp=694707783
input archive log thread=1 sequence=64 recid=7 stamp=694785054
input archive log thread=1 sequence=65 recid=8 stamp=694787797
input archive log thread=1 sequence=66 recid=9 stamp=694794198
input archive log thread=1 sequence=67 recid=10 stamp=694799765
input archive log thread=1 sequence=68 recid=11 stamp=694806827
input archive log thread=1 sequence=69 recid=12 stamp=694809124
input archive log thread=1 sequence=70 recid=13 stamp=694868744
input archive log thread=1 sequence=71 recid=14 stamp=695132728
input archive log thread=1 sequence=72 recid=15 stamp=695210729
input archive log thread=1 sequence=73 recid=16 stamp=695330401
input archive log thread=1 sequence=74 recid=17 stamp=695399695
input archive log thread=1 sequence=75 recid=18 stamp=695412690
input archive log thread=1 sequence=76 recid=19 stamp=695511043
input archive log thread=1 sequence=77 recid=20 stamp=695557945
input archive log thread=1 sequence=78 recid=21 stamp=695597432
input archive log thread=1 sequence=79 recid=22 stamp=695728451
input archive log thread=1 sequence=80 recid=23 stamp=695729334
input archive log thread=1 sequence=81 recid=24 stamp=695729976
input archive log thread=1 sequence=82 recid=25 stamp=695835471
input archive log thread=1 sequence=83 recid=26 stamp=695988878
input archive log thread=1 sequence=84 recid=27 stamp=696160938
input archive log thread=1 sequence=85 recid=28 stamp=696333853
input archive log thread=1 sequence=86 recid=29 stamp=696360658
input archive log thread=1 sequence=87 recid=30 stamp=696454218
channel ORA_DISK_1: starting piece 1 at 03-SEP-09
channel ORA_DISK_1: finished piece 1 at 03-SEP-09
piece handle=D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\ORCL\BACKUPSET\2009_09_03\O1_MF_ANNNN_TAG20090903T115246_59YR5VRV_.BKP tag=TAG20090903T1
=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:01:08
Finished backup at 03-SEP-09
RMAN> restore database preview;
Starting restore at 03-SEP-09
using channel ORA_DISK_1
List of Backup Sets
===================
BS Key Type LV Size       Device Type Elapsed Time Completion Time
1       Full    1.38G      DISK        00:02:21     03-SEP-09
        BP Key: 1   Status: AVAILABLE Compressed: NO Tag: TAG20090903T104947
        Piece Name: D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\ORCL\BACKUPSET\2009_09_03\O1_MF_NNNDF_TAG20090903T104947_59YNHNSK_.BKP
List of Datafiles in backup set 1
File LV Type Ckp SCN    Ckp Time Name
1       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\SYSTEM01.DBF
2       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\UNDOTBS01.DBF
3       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\SYSAUX01.DBF
4       Full 4500421    03-SEP-09 D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\USERS01.DBF
archive logs generated after SCN 4500421 not found in repository
Media recovery start SCN is 4500421
Recovery must be done beyond SCN 4500421 to clear data files fuzziness
Finished restore at 03-SEP-09now i have two backup one is full database backup which will not work another is backup of all archivelog upto sequence 87 i think it should work.
but rman is choosing full database backup for restore.
so i need to force rman to choose archivelog backups for restore but don't know how to do it. please suggest.
Thanks
umesh

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> However, there is no indication which parameter file is corrupt. There is nothing written in directory /sapdb/data/wrk/WD2 when I try to start, so the KnlMsg file does not change either.
>
> My question is for which parameter file is the checksum not correct? Is there a way to fix this parameter file?
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>
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regards,
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It's difficult to have a sensible backup plan except to keep the originals somewhere really safe. Even with metadata writing turned off by default, these files churn. I cannot keep every version of jpg files. And keeping the old files for a short period does not help because bad files don't show up in LR under many circumstances because of the preview files.
I don't know if this is relevant but I never had this happen with LR 1.0.
This is very worrisome and I'm going to get grouchy soon! You guys with RAW are really lucky that LR doesn't write to your files! I'd now love to have an option of a sidecar file which I could write to the jpg only when I'm ready to and have a way to check that the resulting file is still intact.
Of course I haven't proven there isn't an issue with my disk drive, but I've now proven it to myself that there's a very high probability that LR is corrupting jpg files when writing out metadata. I would like to hear if others using jpg files have had corruptions.

Hi, I too also have just experienced jpg corruption. It was a jpg that had been taken several years ago and had not been edited at all. The bottom left hand corner had been transposed from the right hand side. The result of this was the whole bottom 1/5 of the picture was shifted to the right. Also the color of the shifted portion was slightly different from the rest. This is the first jpg corruption in Lightroom I have seen. My backup was the same but fortunately I had a copy on DVD. I am using Windows version of Lightroom 1.2, tried 1.3 and decided to go back to 1.2
Does anyone know if this type of corruption only happens to jpg files. Would it be worthwhile marking them all read-only. I plan to check my other jpgs to see if there are any more corruptions. I mainly shoot RAW now and convert to DNG

Recovering Time Machine after backups were deleted

The event I will describe occurred from an incomplete operation. Hindsight is 20/20. After the mistake, I stopped using the Time Machine drive.
Fearing that my Time Machine drive (1 TB) was becoming full, I proceeded to delete some backups between the start date and the present. Thinking that on the dates I deleted nothing really changed, I thought it was safe.
The dialog appeared, "Preparing to delete files..." and was still on the screen when I realized that any deletion was idiotic. The dialog never changed to indicate files were actually being deleted. After inspection, some files were deleted. There is only a small subset of backups remaining. As no data was ever written to the drive, I'm sure I can recover all or most files.
What is the best path to recover as much backup data as possible? I own the Stellar Phoenix recovery program.
What should I know about the structure of Time Machine archives? My latest attempts have resulted in almost no complete files but rather in hundreds of files named "iNode xxxxxxx" being recovered. I don't find that helpful at all. All changes can be reconstructed with work. All I care about are the original downloaded files. The diff files (I assume that is how TM works) are negligible.
Thank you for helping this Macintosh and TM amateur.
Robert

Hi, and welcome to the forums.
Unfortunately, Apple doesn't do a very good job of warning people: +*Never, ever, move, change, or delete anything in your TM backups via the Finder.+* That can hopelessly corrupt them.
They do have special "deny everybody everything" permissions, but that isn't enough, as you've found out.
Just for future reference, see #12 in the Frequently Asked Questions *User Tip* at the top of this forum.
Time Machine uses some rather complex techniques, so it can perform only incremental backups of what's new or changed, but have each backup be, in effect, a full one. This is done with multiple "hard links" to the actual backup items, at both the file and directory level. Think of them as multiple aliases. Few 3rd-party apps understand this. So be sure your recovery program is fully compatible with Leopard.
I think that +Data Rescue II+ is, but I've never used it, so can't be sure.
Most likely, the best you'll be able to recover are some "raw" files.

Recovering MaxDB instance after file corruption

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