1DROP TABLE IF EXISTS diaries;
2SET NAMES utf8;
3CREATE TABLE diaries (
4id int PRIMARY KEY,
5title varchar(255),
6created_at datetime,
7KEY title_and_created_at_index (title, created_at)
8) COMMENT='ENGINE "InnoDB"' DEFAULT CHARSET=utf8;
9INSERT INTO diaries VALUES (1, "Hello", "2012-04-30 20:00:00");
10INSERT INTO diaries VALUES (2, "天気" , "2012-04-30 23:00:00");
11INSERT INTO diaries VALUES (3, "富士山", "2012-04-30 19:00:00");
12SELECT *
13FROM diaries
14FORCE INDEX (title_and_created_at_index)
15WHERE title = "天気" AND
16created_at = "2012-04-30 23:00:00";
17id	title	created_at
182	天気	2012-04-30 23:00:00
19ALTER TABLE diaries DISABLE KEYS;
20SELECT *
21FROM diaries
22FORCE INDEX (title_and_created_at_index)
23WHERE title = "天気" AND
24created_at = "2012-04-30 23:00:00";
25id	title	created_at
262	天気	2012-04-30 23:00:00
27DROP TABLE diaries;
28