以下の SQL クエリを使用していますが、実行に 180 秒以上かかります。それをスピードアップする方法はありますか?この SQL は、pic_id とすべての女性の ID を教えてくれます。
SELECT pic_id, small
FROM picture
WHERE hide =0
AND userhide =0
AND `fbid`
IN (
SELECT fbid
FROM user
WHERE gender = "female"
)
ORDER BY `picture`.`pic_id` ASC
LIMIT 1500 , 200
Explain SQL
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY picture index NULL PRIMARY 4 NULL 1700 Using where
2 DEPENDENT SUBQUERY user ALL NULL NULL NULL NULL 7496 Using where
--- Tim の sql answer に対する Explain ステートメントの結果 ---
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE picture ALL NULL NULL NULL NULL 41443 Using where; Using temporary; Using filesort
1 SIMPLE user ALL NULL NULL NULL NULL 7501 Using where; Using join buffer
- 構造 - -
CREATE TABLE `user` (
`sid` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) CHARACTER SET utf8 NOT NULL,
`first_name` varchar(255) CHARACTER SET utf8 NOT NULL,
`username` varchar(255) CHARACTER SET utf8 NOT NULL,
`birthday` date NOT NULL,
`location` varchar(255) CHARACTER SET utf8 NOT NULL,
`gender` varchar(6) CHARACTER SET utf8 NOT NULL,
`created` date NOT NULL,
`fbid` bigint(50) NOT NULL,
`token` varchar(255) CHARACTER SET utf8 NOT NULL,
`relationship_status` varchar(20) CHARACTER SET utf8 NOT NULL,
`smallest` varchar(255) CHARACTER SET utf8 NOT NULL,
`email` varchar(40) CHARACTER SET utf8 NOT NULL,
`ref` varchar(15) NOT NULL,
PRIMARY KEY (`sid`),
KEY `gender` (`gender`),
KEY `fbid` (`fbid`)
) ENGINE=MyISAM AUTO_INCREMENT=7595 DEFAULT CHARSET=latin
---- ピクチャーテーブルの構造 ---
CREATE TABLE `picture` (
`fbid` bigint(50) NOT NULL,
`pic_id` int(11) NOT NULL AUTO_INCREMENT,
`pic_location` varchar(255) NOT NULL,
`hide` int(1) NOT NULL,
`small` varchar(255) NOT NULL,
`userhide` int(1) NOT NULL,
`likes` int(10) NOT NULL,
`hot` int(1) NOT NULL,
PRIMARY KEY (`pic_id`),
UNIQUE KEY `pic_location` (`pic_location`),
UNIQUE KEY `small` (`small`),
KEY `fbid` (`fbid`),
KEY `hide` (`hide`),
KEY `userhide` (`userhide`)
) ENGINE=MyISAM AUTO_INCREMENT=42749 DEFAULT CHARSET=latin1