Question

Stumped on this query, it searches an important table which contains about 213k rows. The purpose of the query is to report traffic data for a month. The amount of traffic for each day of that month. And sum of a decimal value for each day. This query is ran frequently so I need to optimize it to the best possible. Currently takes avg. 2 seconds..

SQL Fiddle: http://sqlfiddle.com/#!2/171f5/3/0

All suggestions will be greatly appreciated! Thank you.

Query:

SELECT `date_day`, COUNT(*) AS num, SUM(decval) AS sum_decval FROM (`tbl_traffic`)
WHERE `uuid` = '1' AND `date_year` = '2012' AND `date_month` = '11'
GROUP BY `date_day`;

Explain Result:

id: 1
select_type: SIMPLE
table: adb1_analytics
type: ref
possible_keys: keys1,keys2,keys3
key: keys1
key_len: 7
ref: const,const,const
rows: 106693
Extra: Using where
1 row in set (0.13 sec)

Table structure:

CREATE TABLE IF NOT EXISTS `tbl_traffic` (
  `id` int(100) unsigned NOT NULL AUTO_INCREMENT,
  `uuid` int(100) unsigned NOT NULL,
  `country` char(2) CHARACTER SET latin1 DEFAULT NULL,
  `browser` varchar(50) CHARACTER SET latin1 DEFAULT NULL,
  `platform` varchar(50) CHARACTER SET latin1 DEFAULT NULL,
  `referrer` varchar(255) COLLATE utf8_bin DEFAULT NULL,
  `decval` decimal(15,5) NOT NULL,
  `date_year` smallint(4) unsigned NOT NULL,
  `date_month` tinyint(2) unsigned NOT NULL,
  `date_day` tinyint(2) unsigned NOT NULL,
  PRIMARY KEY (`id`),
  KEY `keys1` (`uuid`,`date_year`,`date_month`,`date_day`),
  KEY `keys2` (`date_year`,`date_month`,`referrer`),
  KEY `keys3` (`date_year`,`date_month`,`country`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

Answer 1

Use count(id) and add keys on date_day and decval.
A covering key over both fields might be even better