Re: Creating a missing datafile

Ross Collado wrote:
>
> Env.
> HP-UX 10.2
> Oracle 7.1.6
> Archivelog mode
>
> Found this in the alert.log
>
> Dictionary check beginning
> File #41 found in data dictionary but not in controlfile.
> Creating OFFLINE file 'MISSING0041' in the controlfile.
> Dictionary check complete
>
> I did a dump of the controlfile to trace and checked. It had MISSING0041 in
> it. However, I did a find on this file and couldn't find it. Does this
> mean MISSING0041 was just updated in the controlfile and was not actually
> created as a physical file?
> I know the complete path/filename of what this MISSING0041 datafile should
> be (it should be /u2/db/archive2_2.dbf). This is actually the 3rd datafile
> of ARCHIVE tablespace. If this file existed then it would have been an easy
> rename of datafile via "ALTER TABLESPACE ... RENAME DATAFILE...". But there
> is no physical file to rename.
> I don't think I can do a create a file via "ALTER DATABASE CREATE
> DATAFILE..." in this case because the controlfile won't have the correct
> path/filename of this datafile (it's got 'MISSING0041' SIZE 500M).
> How do I go about recreating a physical file having the correct filename and
> size?
>
> TIA,
>
> Ross
>

Ross,

   Do not be mistaken : RENAME DATAFILE is nothing more than an update inside the control file. It does nothing the operating system knows of. You can rename MISSING0041 to /u2/db/archive2_2.dbf. Concerning the size, I guess that ALTER DATABASE ... RESIZE should fix it, although this is little bit more dubious, since this command ACTUALLY extends files. Perhaps you could resize it to a little more than the real current size.
Another solution would be to recreate control files, by doing an ALTER DATABASE BACKUP CONTROLFILE TO TRACE and editing the resulting trace file to reinsert the proper file name. If your database is in a relatively clean state (i.e. nothing in redo log files) it should be safe.
Backup your database before attempting anything ... (control files included)

-- 
Regards,

Stephane Faroult
Oriole Ltd
-- 
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Author: Stephane Faroult
  INET: sfaroult_at_oriole.com

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