ORA Database Error Messages ORA-01146: cannot start online backup – file string is already in backup June 2, 2015 mpbod ORA-01146: cannot start online backup – file string is already in backup Cause: When starting an online backup it was noticed that an online backup was already started for one of the data files. Action: End the first backup before beginning another. 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)