ORA Database Error Messages ORA-16727: resource guard cannot close database October 6, 2015 mpbod ORA-16727: resource guard cannot close database Cause: The resource guard could not close the database. Action: Check if there any active sessions connect to the database, terminate them, then reissue the request. Back to previous menu 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)