title: novalidate with error ora-02299
body: <p>can anybody help with me with this?</p>
  
  <pre><code>id | Name
  --------
  1  | aaa
  2  | bbb
  3  | aaa
  
  &gt;alter table arc add CONSTRAINT uk_arc UNIQUE (NAME) novalidate
   error :ora-02299: cannot validate( .uk_arc ) - duplicate keys found
  </code></pre>
  
  <p>I am using novalidate to ignore the old duplicate and start to validate all over again.</p>