Question

I have a collection with 1.5 million documents. I’m counting using PHP:

$db->some->ensureIndex(array("sometext" => 1));
$db->some->ensureIndex(array("datsbla" => 1));
$arr["sometext"] = $string; 
$arr["datsbla"] = array('$gte' => $some, '$lte' => $thing);
$count = $db->some->count($arr);

I turned on the profiler and every count like that is like 4500 ms. I have 20 counters like that in my page, so it makes my web page VERY VERY SLOW.

What should I do to make it faster (< 100 ms) ? Is it even possible using MongoDB?

Thanks.

Answer 1

You have two separate individual indexes – a query can only use 1 index at a time, so you are not taking advantage of the indexing fully. Try a compound index on both fields and you should see a significant improvement.