One control file corrupted, how to recover?

The first control file get corrupted, and the db can't start up. The second and third are ok. How can I recover the first control file and bring the db up?
Thanks

but still not up:
SQL> startup
ORACLE instance started.
Total System Global Area 830472192 bytes
Fixed Size 2032520 bytes
Variable Size 746593400 bytes
Database Buffers 75497472 bytes
Redo Buffers 6348800 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
from alert:
Errors in file /opt/oracle/admin/pacedev5/bdump/pacedev5_lgwr_14488.trc:
ORA-19502: write error on file "/opt/oracle/u01/pacedev5/control01.ctl", blockno 297 (blocksize=16384)
ORA-27063: number of bytes read/written is incorrect
Additional information: 24576
Additional information: 196608
LGWR: terminating instance due to error 19502
Instance terminated by LGWR, pid = 14488
dbv the control file and see the corrupted blocks
something else could be wrong?
thanks

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Hi all,
I read some post from this forum and i found at this : http://forums.oracle.com/forums/login.jspa
where user lost all the CONTROL FILE.
Instead I have a problem only with one...but I have this error "ORA-00205...." I could start the DB but can't mount or open the DB.
The problem was born when I tried to move one CONTROL FILE (Control02.ctl) from the original dir to another.
For doing this I have done from SQL+ as SYSDBA: (the DB was OPEN)
1) SQL> select name from v$controlfile;
2) SQL> ALTER SYSTEM SET control_files='C:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\CONTROL01.CTL, G:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\CONTROL02.CTL, C:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\CONTROL03.CTL'
SCOPE=SPFILE;
--->Changed directory of CONTROL02.CTL from disk C to G <---
3) SQL> Shutdown immediate
4) From OS (windows 2003) moved CONTROL02.CTL to new directory (G:\..)
5) SQL> Startup (--> I have this errors :ORA-00205....check allert.log..)
Checking ALLERT.LOG I found this errors :
ORA-00202: control file: 'C:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\CONTROL01.CTL, G:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\CONTROL02.CTL, C:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\CONTROL03.CTL'
ORA-27041: impossible open file
OSD-04002: ssible open file
O/S-Error: (OS 123)
So now..I have the DB down and I don't know how reopen it. Someone can Help me ?
Any suggest will'be glad
Thanks
Diego

Hi all,
I read some post from this forum and i found at this
: http://forums.oracle.com/forums/login.jspa
where user lost all the CONTROL FILE.
Instead I have a problem only with one...but I have
this error "ORA-00205...." I could start the DB but
can't mount or open the DB.
The problem was born when I tried to move one CONTROL
FILE (Control02.ctl) from the original dir to
another.
For doing this I have done from SQL+ as SYSDBA: (the
DB was OPEN)
1) SQL> select name from v$controlfile;
2) SQL> ALTER SYSTEM SET
control_files='C:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\
CONTROL01.CTL,
G:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\CONTROL02.CTL,
C:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\CONTROL03.CTL'
SCOPE=SPFILE;
--->Changed directory of CONTROL02.CTL from disk C to
G <---
3) SQL> Shutdown immediate
4) From OS (windows 2003) moved CONTROL02.CTL to new
directory (G:\..)
5) SQL> Startup (--> I have this errors
:ORA-00205....check allert.log..)
Checking ALLERT.LOG I found this errors :
ORA-00202: control file:
'C:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\CONTROL01.CTL,
G:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\CONTROL02.CTL,
C:\ORACLE10.2.0G\ORADATA\CENTRALENIXUS\CONTROL03.CTL'
ORA-27041: impossible open file
OSD-04002: ssible open file
O/S-Error: (OS 123)
So now..I have the DB down and I don't know how
reopen it. Someone can Help me ?
Any suggest will'be glad
Thanks
DiegoHi,
in my opinion:
ad 2)
ALTER SYSTEM SET control_files="/location1", "/location2","/location3" SCOPE=SPFILE;
but there is a another solution:
a) insert correct path into file: init<SID>.ora
b) startup pfile=/location_to_init.ora
c) create spfile from pfile
Also chceck if you have right permission in new location.
S.

If it is not specified,Oracle creates one control file in a default locatio

Hi
The CONTROL_FILES parameter is not required when you create a database. If it is not specified,Oracle creates one control file in a default location,.
Where oracle create contol file default in this condition
Thanks

Can you try to create a database and see
FYI
It creates in $ORACLE_HOME\database folder..if not specified but in UNIX i think it will be under $ORACLE_HOME/dbs
Because i dont have UNIX right now to test it
Message was edited by:
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Control file corrupted

HI, My database was operating on noarchivelog mode, I do have a backup from last night but all three control files seemed to be corrupted. Is there anyway, i can create new control file and syncronise with rest of the files?. If yes, can you please tell me the steps involved in creating new controlfile as I don't have any idea how to do that. Thanks alot.

Hi,
Set oracle_sid="your sid name"
connect to sqlplus
SQL>conn/as sysdba
start your database in nomount stage
SQL>Startup nomount
Then type the following commands
SQL> CREATE CONTROLFILE REUSE DATABASE "your database name"
MAXLOGFILES 5 --optional
MAXLOGMEMBERS 3 --optional
MAXDATAFILES 14 --optional
MAXINSTANCES 1 --optional
MAXLOGHISTORY 226 --optional
LOGFILE
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DATAFILE
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MAXLOGMEMBERS 3
MAXDATAFILES 14
MAXINSTANCES 1
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'E:\ORACLE\ORADATA\ORCL\UNDOTBS01.DBF',
'E:\ORACLE\ORADATA\ORCL\EXAMPLE01.DBF',
'E:\ORACLE\ORADATA\ORCL\INDX01.DBF',
'E:\ORACLE\ORADATA\ORCL\TOOLS01.DBF',
'E:\ORACLE\ORADATA\ORCL\USERS01.DBF',
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'E:\ORACLE\ORADATA\ORCL\XDB01.DBF',
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In case of Control File Failure, Create Control File cmd how get scn?

The following lines i picked from the
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:5033895918209
======================================================
1. We can use the 'alter database rename ' at mount stage to rename any datafile. Or is it not possible to rename the system datafile like this? Why?
2. What happens to the SCN information in the controlfile when a controlfile is recreated? How will the database sync the SCN with that of the datafiles?
If I issue a 'backup controlfile to <file>' at 8 am and then restore that controlfile binary backup at 10 am and try to open the database, it will give me a control file old error. I understand that it is because the SCN is not in sync. But if I issue a 'backup controlfile to trace' at 8 am and use that script to recreate a new controlfile at 10 am, why doesn't I get the error? Where does it get the SCN information then?
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When moving system -- I do it that way
When moving ANY OTHER tablespace -- i just offline it, move the files, rename the files online it.
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I agree, I've never used a binary controlfile backup myself.
=========================================================
My Question- In the Point2 above "Where does it get the SCN information and how control file do SCN Sync with data files?
"

1. The CREATE CONTROLFILE reads SCNs from the DataFiles. If the
database was last shutdown, all the datafiles are "non-fuzzy" and have the same
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to the question
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