MySQL:具有多个连接的慢速查询
我有一个包含大约100个Mysql表的数据库。所有表格都在INNODB下。MySQL:具有多个连接的慢速查询,mysql,performance,full-text-search,Mysql,Performance,Full Text Search,我有一个包含大约100个Mysql表的数据库。所有表格都在INNODB下。 我们公司为我们的用户提供语法检查和翻译服务 下面是简化的数据库模式 每个用户都可以通过搜索引擎按关键字搜索自己的项目。每个查询都使用全文搜索 我还创建了一个视图: create view searches as Select project_contents.content_markdown, project_contents.content_jp_markdown, project_contents.r
我们公司为我们的用户提供语法检查和翻译服务 下面是简化的数据库模式 每个用户都可以通过搜索引擎按关键字搜索自己的项目。每个查询都使用全文搜索 我还创建了一个视图:
create view searches as
Select
project_contents.content_markdown,
project_contents.content_jp_markdown,
project_contents.remarks_markdown,
project_corrections.correction_markdown,
project_corrections.comment_markdown,
project_messages.message_from_markdown,
project_messages.message_to_markdown,
projects.id,
projects.user_id,
projects.project_category_id,
projects.uuid,
projects.teacher_id,
projects.title,
projects.is_deleted,
projects.submit_date,
projects.receipt_date,
projects.correct_date,
project_questions.question_markdown,
project_questions.answer_markdown,
project_rates.content_markdown As rate_content_markdown,
teachers.username,
project_categories.parent_id,
project_additional_writings.append_markdown
From
project_contents
INNER JOIN projects
ON project_contents.project_id = projects.id
INNER JOIN project_messages
ON project_messages.project_id = projects.id
INNER JOIN project_categories
ON projects.project_category_id = project_categories.id
LEFT JOIN project_questions
ON project_questions.project_id = projects.id
LEFT JOIN project_rates
ON project_rates.project_id = projects.id
LEFT JOIN project_corrections
ON project_corrections.project_content_id = project_contents.id
LEFT JOIN project_additional_writings
ON project_additional_writings.project_id = projects.id
LEFT JOIN teachers
ON projects.teacher_id = teachers.id
这里是查询
SELECT `search`.`id`,
`search`.`uuid`,
`search`.`user_id`,
`search`.`parent_id`,
`search`.`project_category_id`,
`search`.`teacher_id`,
`search`.`username`,
`search`.`is_deleted`,
`search`.`title`,
`search`.`submit_date`,
`search`.`receipt_date`,
`search`.`correct_date`,
`search`.`content_jp_markdown`,
`search`.`remarks_markdown`,
`search`.`content_markdown`,
`search`.`correction_markdown`,
`search`.`comment_markdown`,
`search`.`question_markdown`,
`search`.`answer_markdown`,
`search`.`append_markdown`,
`search`.`rate_content_markdown`,
`search`.`message_from_markdown`,
`search`.`message_to_markdown`,
`search`.`memo_markdown`,
(match(`search`.`title`) against('"famous blogger"' IN boolean mode)) AS `search__score_title`,
(match(`search`.`content_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_content_markdown`,
(match(`search`.`content_jp_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_content_jp_markdown`,
(match(`search`.`remarks_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_remarks_markdown`,
(match(`search`.`correction_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_correction_markdown`,
(match(`search`.`comment_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_comment_markdown`,
(match(`search`.`message_from_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_message_from_markdown`,
(match(`search`.`message_to_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_message_to_markdown`,
(match(`search`.`question_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_question_markdown`,
(match(`search`.`answer_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_answer_markdown`,
(match(`search`.`append_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_append_markdown`,
(match(`search`.`rate_content_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_rate_content_markdown`,
(match(`search`.`memo_markdown`) against('"famous blogger"' IN boolean mode)) AS `search__score_memo_markdown`
FROM `idiy_v3`.`searches` AS `search`
WHERE `search`.`is_deleted` = '0'
AND `search`.`parent_id` = 1
AND `search`.`user_id` = 217
AND ((`search`.`username` LIKE '%famous blogger%')
OR (match(`search`.`title`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`content_markdown`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`content_jp_markdown`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`remarks_markdown`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`correction_markdown`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`comment_markdown`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`message_from_markdown`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`message_to_markdown`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`question_markdown`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`answer_markdown`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`append_markdown`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`rate_content_markdown`) against('\"famous blogger\"' IN boolean mode))
OR (match(`search`.`memo_markdown`) against('\"famous blogger\"' IN boolean mode)))
GROUP BY `search`.`id`
ORDER BY `search`.`submit_date` DESC limit 5
默认情况下,每个查询需要15到25秒(取决于用户的项目数、关键字等)
当我从project\u corrections
表中删除列时,
查询时间不足10秒
为什么会有这么多差异?如何优化查询?添加一个新表,将用户名和所有标记的副本连接到一个
文本
列中。在该列上有一个全文
索引。您的SELECT
将对该列执行单个匹配,然后将连接到其他表以获取详细信息
一次匹配
的速度大约是13次匹配的13倍。而且或很难优化。谢谢你的回答。如果其他表中有一个有新记录或更新,有没有办法自动更新这个新表?我认为触发器不实用。在应用程序中编写一个子例程,处理额外的INSERT
。很好!非常感谢:)