php - WP_Query() does not return all entries

Question

I have this query that returns only a few of the entries I have on the table. I have over 10 posts but this query only returns 6. Please help with suggestions

$query = new WP_Query("year=2011&monthnum=09&post_status=publish&post_type=post&orderby=post_date&order=DESC");
while ($query->have_posts()):
    $query->the_post();
    $title=get_the_Title();                                                                                                                  
    echo"<p><input type="checkbox" name="MyArticle[]" value="".get_the_ID()."">".get_the_Title()."</p>";
endwhile;               
wp_reset_query();

Answer 1

Try adding posts_per_page=-1 to the string of parameters passed to WP_Query.

If that value is not set, then it falls back to use the default posts per page option you have set in Settings >> Reading >> Blog pages show at most.

My guess is that this value is 6 so its returning that many posts since you did not specify a different limit.