Save Node Title By database query I am trying to update a node title by database query as 

 $num_updated = db_update('node') // Table name no longer needs {}
  -&gt;fields(array(
    'title' =&gt; "custom_title",
    'status' =&gt; 1,
  ))
  -&gt;condition('nid', $nid, '=')
  -&gt;execute();


The above code is updating the node title in node table, but on node display I am not seeing the updated title.

The reason I am not using node_save() to update node title is to by pass auto entity label functionality for updating node title.
You also need to update the node_revision table. You either need to create a new revision for that node or update the latest one.