optimize select query with ORDER BY and MATCH AGAINST

Question

The following query takes 25 seconds with 2 table joins. The first posts table has 150,00 rows, topics table has 50,000 rows. Anyone know how I can speed this up.

Answer 1

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DROP TABLE IF EXISTS `wordpress`.`bb_posts_fulltext_search`;
CREATE TABLE `wordpress`.`bb_posts_fulltext_search` (
`post_id` int(10) unsigned NOT NULL,
`post_text` longtext,
`topic_id` int(10) unsigned NOT NULL DEFAULT '0',
PRIMARY KEY (`post_id`,`topic_id`) USING BTREE,
FULLTEXT KEY `post_text` (`post_text`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

DROP TABLE IF EXISTS `wordpress`.`bb_topics_fulltext_search`;
CREATE TABLE `wordpress`.`bb_topics_fulltext_search` (
`topic_id` int(11) NOT NULL,
`topic_title` varchar(255) DEFAULT NULL,
`topic_posts` bigint(20) DEFAULT NULL,
`topic_poster_name` varchar(40) DEFAULT NULL,
`topic_last_post_id` bigint(20) DEFAULT NULL,
`forum_id` int(11) DEFAULT NULL,
`parent_group_id` int(11) DEFAULT NULL,
`child_group_id` int(11) DEFAULT NULL,
`topic_last_post_time` datetime DEFAULT NULL,
PRIMARY KEY (`topic_id`),
KEY `topic_last_post_time` (`topic_last_post_time`),
FULLTEXT KEY `topic_title` (`topic_title`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

SELECT
  topic_search.topic_id,
  topic_search.topic_title,
  topic_search.topic_posts,
  topic_search.topic_title,
  topic_search.topic_poster_name,
  topic_search.topic_last_post_id,
  topic_search.topic_last_post_time,
  MATCH(post_search.post_text,topic_search.topic_title) 
    AGAINST('searchterms' IN BOOLEAN MODE) AS score
FROM bb_posts_fulltext_search as post_search
LEFT JOIN bb_topics_fulltext_search as topic_search
  ON post_search.topic_id = topic_search.topic_id
WHERE 
  MATCH(post_search.post_text,topic_search.topic_title) 
    AGAINST('searchterms' IN BOOLEAN MODE)
GROUP BY topic_search.topic_id
ORDER BY score DESC
LIMIT 0,6