Send me the dbv's of each of the corrupted files. A trace dump and a dd dump of each corrupt block labled appropriately so I know which is which. A trace dump and dd dump of the first 10 blocks of user file 1. We also might try a single datafile recovery on another server of just the system datafile so we can get the real file names and data dictionary information for the database. -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of jost@xxxxxxxxxxxx Sent: Tuesday, September 06, 2005 3:00 AM To: oracle-l@xxxxxxxxxxxxx Subject: Re: Reading corrupted Datafiles offline On Tuesday 06 September 2005 08:42, Parker, Matthew wrote: > As Jim mentioned there is the DUL (Data Unloader ) tool that Oracle > consulting can use for you. The normal stated accuracy is 99% depending on > your system. It never understood how to follow chained rows. You are lucky > to be on 8.1.6 as they never updated the tool to 9i/10g according to the > developer, ( a project sometime in the future for him). > > Give us so more details about what exactly happened and what you have of > your database, then we may be able to help you. hi, here first the short version of what was happend. First off all, the database belongs to a small customer of our company. This customer doesn't take care of the backup what we have learned the hard way. After a harddisk failure, which was not recoverable, some datafiles get lost, other datafile get corrupted and some are totally ok. Controlfiles are lost System - Datafile is good Rollback is totally lost Redo Logs are good Temp is good User_Data was a bunch of 6 Files File 1 is good File 2 is corrupted (4 Blocks including Block# 1) File 3 is corrupted (1 Block) File 4 is corrupted (2 Blocks including Block# 1) File 5 is corrupted (48 Blocks including Block# 1) File 6 is missing A Problem is, that we are not able to determine the right filename for some of the files. The corrupted ones are the result of the recover of the bad hard - disk. The original filename was lost, so we are unable to get the right filename. Unfortunatly dbv is not giving the filename or filenumber as a result of the offline check. My intention is now to read or even export the data, which is included in the datafiles of the tablespace USER_DATA. Because of the missing controlfiles, i try to create new ones with the following SQL: STARTUP NOMOUNT CREATE CONTROLFILE REUSE SET DATABASE SCHU RESETLOGS NOARCHIVELOG MAXLOGFILES 32 MAXLOGMEMBERS 2 MAXDATAFILES 254 MAXINSTANCES 8 MAXLOGHISTORY 907 LOGFILE GROUP 1 '/pro1/oradata/SCHU/redo01.log' SIZE 10M, GROUP 2 '/pro1/oradata/SCHU/redo02.log' SIZE 10M, GROUP 3 '/pro1/oradata/SCHU/redo03.log' SIZE 10M DATAFILE '/pro1/oradata/SCHU/system01.dbf', '/pro1/oradata/SCHU/temp01.dbf', '/pro1/oradata/SCHU/usr1SCHU.dbf', '/pro1/oradata/SCHU/usr2SCHU.ora', '/pro1/oradata/SCHU/usr3SCHU.ora', '/pro1/oradata/SCHU/usr4SCHU.ora', '/pro1/oradata/SCHU/usr5SCHU.ora' CHARACTER SET WE8PC850 ; The init.ora includes the parameter _allow_resetlogs_corruption=true The above mentioned SQL fails with the following error: ORA-01503: CREATE CONTROLFILE gescheitert ORA-01210: Datendatei-Header hat physikalischen Fehler ORA-01110: Datendatei : '/pro1/oradata/SCHU/usr2SCHU.ora' sorry for german, here the english translation: ORA-01503 CREATE CONTROLFILE failed ORA-01210 data file header is media corrupt ORA-01110 data file '/pro1/oradata/SCHU/usr2SCHU.ora' This is my point now. I have to restore the header of the files with a corrupt block# 1 i think. But i don't know how. So i thought about an offline datafile reader like dbv, which is able to get the data out of the datafiles. I will also start to discuss this with the Oracle support as well. But if someone of you have any ideas, i will of course appreciate this. Thx in advance. Jörg -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l