Re: Accidentally created local df in RAC

From: Lei Zeng <>
Date: Wed, 7 Mar 2012 21:14:41 -0800 (PST)
Message-ID: <>

Oracle has a 'drop' datafile command since 10gR2 (if the datafile is empty file) I never tried myself but I saw it in other people's blog.

Would you please test it out on a development box first? Just be cautious.

alter tablespace <tb name> drop datafile '<file_name> ';


From: Herring Dave - dherri <> To: "" <> Sent: Wednesday, March 7, 2012 3:35 PM
Subject: Accidentally created local df in RAC

I've got a potential resume-faxing situation in dealing with a 20+ TB db.  This is on a 6-node RAC, Oracle, RHEL 4.x, ASM, OMF.

I added a datafile to a tablespace on node1 and unfortunately forgot the plus sign in front of the diskgroup.  We use OMF so what happened is instead of a datafile getting added to ASM under <diskgroup>/<db>... it created one on node1 under $ORACLE_HOME/dbs.  Of course the other 5 nodes started complaining about ORA-01157 errors.  I saw this right away and quickly offlined the datafile.  Now the datafile has an ONLINE_STATUS of "RECOVER".

Unfortunately the database is in noarchivelog mode and also critical production (odd combo, I know), so I'm paranoid on trying anything further.  My thought is to use DBMS_FILE_TRANSFER to put the datafile in ASM, then do a rename and bring it online.  Is that the best method?  I'm pretty sure nothing got written to the datafile as DBA_EXTENTS shows no extents in that FILE_ID.


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Received on Wed Mar 07 2012 - 23:14:41 CST

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