ORA Database Error Messages ORA-01256: error in locking database file string June 3, 2015 mpbod ORA-01256: error in locking database file string Cause: The file is in use by another database instance. Action: Determine which database instance legitimately owns the file. Back to previous menu https://support.oracle.com/ http://www.oracle.com/ Share this:Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)