title: Symfony2  doctrine:schema:drop --force doesn't work
body: <p>With Symfony 2.0.12 and an Oracle 10g database, I don't understand why my command:</p>
  
  <pre><code>php app/console doctrine:schema:drop --force
  </code></pre>
  
  <p>doesn't work. It tells me: "Database schema dropped succesfully!" but I have still few tables in my schema.
  Does anyone get the same issue ?</p>
  
  <p>I tried with:</p>
  
  <pre><code>php app/console doctrine:schema:drop --force --full-database
  </code></pre>
  
  <p>and i get:</p>
  
  <pre><code>ORA-02264: name already used by an existing constraint
  </code></pre>
  
  <p>And finally after 3 times, my schema is well deleted, but still, I don't understand.</p>