title: Postgres 9.3 pg_stat_activity.query length won't change
body: <p>There are a few large SQLs tying up connections to the database over time and I'd like to be able to see the queries but pg_stat_activity.query truncates anything over 256 chars by default so I edited my postgresql.conf to contain</p>
  
  <pre><code>track_activities = on
  track_activity_query_size = 2048
  </code></pre>
  
  <p>However even after changing this and restarting postgres</p>
  
  <pre><code>select query from pg_stat_activity;
  select pg_stat_get_backend_activity(id);
  </code></pre>
  
  <p>Still returned only the first 256 characters of an SQL.</p>
  
  <p>I know I am editing the right config file as its the one returned by </p>
  
  <pre><code>show conf_file;
  </code></pre>
  
  <p>But I'm not sure why it isn't showing any more than 256 characters.</p>