title: Drupal Installation PDOException
body: <p><code>http://localhost</code>  got problem:</p>
  
  <blockquote>
    <p>PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'drupal_test.semaphore' doesn't exist: SELECT expire, value FROM {semaphore} WHERE name = :name; Array ( [:name] => variable_init ) in lock_may_be_available() (line 165 of /var/www/drupal/includes/lock.inc).</p>
  </blockquote>
  
  <p>This is my database configuration:</p>
  
  <pre><code>$databases = array (
    'default' =&gt; 
    array (
      'default' =&gt; 
      array (
        'database' =&gt; 'drupal_test',
        'username' =&gt; 'root',
        'password' =&gt; 'XXX',
        'host' =&gt; 'localhost',
        'port' =&gt; '',
        'driver' =&gt; 'mysql',
        'prefix' =&gt; '',
      ),
    ),
  );
  </code></pre>
  
  <p>What to do?</p>