ORA Database Error Messages ORA-02455: The number of cluster key column must be 1 June 19, 2015 mpbod ORA-02455: The number of cluster key column must be 1 Cause: When specifing the HASH IS option, the number of key columns must be 1. Action: Either do not specify the HASH IS option or reduce the number of key columns. 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)