ORA Database Error Messages ORA-07491: scgrcl: cannot cancel lock request July 15, 2015 mpbod ORA-07491: scgrcl: cannot cancel lock request Cause: lm_cancel failed during lock release/cancel. Action: Check result code in sercerrno. Possible lock manager failure. 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)