php - MySQL Slow on join. Any way to speed up

Question

I have 2 tables. 1 is music and 2 is listenTrack. listenTrack tracks the unique plays of each song. I am trying to get results for popular songs of the month. I'm getting my results but they are just taking too long. Below is my tables and query

430,000 rows

CREATE TABLE `listentrack` (
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `sessionId` varchar(50) NOT NULL,
    `url` varchar(50) NOT NULL,
    `date_created` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    `ip` varchar(150) NOT NULL,
    `user_id` int(11) DEFAULT NULL,
     PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=731306 DEFAULT CHARSET=utf8

12500 rows

CREATE TABLE `music` (
   `music_id` int(11) NOT NULL AUTO_INCREMENT,
   `user_id` int(11) NOT NULL,
   `title` varchar(50) DEFAULT NULL,
   `artist` varchar(50) DEFAULT NULL,
   `description` varchar(255) DEFAULT NULL,
   `genre` int(4) DEFAULT NULL,
   `file` varchar(255) NOT NULL,
   `url` varchar(50) NOT NULL,
   `allow_download` int(2) NOT NULL DEFAULT '1',
   `plays` bigint(20) NOT NULL,
   `downloads` bigint(20) NOT NULL,
   `faved` bigint(20) NOT NULL,
   `dateadded` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
   PRIMARY KEY (`music_id`)
) ENGINE=MyISAM AUTO_INCREMENT=15146 DEFAULT CHARSET=utf8


SELECT COUNT(listenTrack.url) AS total, listenTrack.url 
FROM listenTrack
LEFT JOIN music ON music.url = listenTrack.url
WHERE DATEDIFF(DATE(date_created),'2009-08-15') = 0
GROUP BY listenTrack.url
ORDER BY total DESC
LIMIT 0,10

this query isn't very complex and the rows aren't too large, i don't think.

Is there any way to speed this up? Or can you suggest a better solution? This is going to be a cron job at the beggining of every month but I would also like to do by the day results as well.

Oh btw i am running this locally, over 4 min to run, but on prod it takes about 45 secs

Answer 1

I'm more of a SQL Server guy but these concepts should apply.

I'd add indexes:

1. On ListenTrack, add an index with url, and date_created
2. On Music, add an index with url

These indexes should speed the query up tremendously (I originally had the table names mixed up - fixed in the latest edit).