如何优化mysql全文联合搜索？

我的数据库表article1有~18000文章，article2有~7000文章，article3有~13000文章。字段猫是一个INDEX字段

现在我想进行联合搜索。有5组词汇放入3张表中，找出结果。但处理时间为3.1213495136 seconds。（我加了microtime()看看会花费多少时间）。有什么办法来优化MySQL全文联合搜索？谢谢。

(SELECT title,content,date FROM article1 WHERE 
(cat='novel' AND MATCH (title,content) AGAINST ('+Mary +Barnard' IN BOOLEAN MODE)) 
OR 
(cat='novel' AND MATCH (title,content) AGAINST ('+Patricia +Beer' IN BOOLEAN MODE)) 
OR 
(cat='novel' AND MATCH (title,content) AGAINST ('+Aphra +Behn' IN BOOLEAN MODE)) 
OR 
(cat='novel' AND MATCH (title,content) AGAINST ('+Judy +Blume' IN BOOLEAN MODE)) 
OR 
(cat='novel' AND MATCH (title,content) AGAINST ('+Elizabeth +Bowen' IN BOOLEAN MODE))) 
UNION 
(SELECT title,content,date FROM article2 WHERE 
(MATCH (title,content) AGAINST ('+Mary +Barnard' IN BOOLEAN MODE)) 
OR 
(MATCH (title,content) AGAINST ('+Patricia +Beer' IN BOOLEAN MODE)) 
OR 
(MATCH (title,content) AGAINST ('+Aphra +Behn' IN BOOLEAN MODE)) 
OR 
(MATCH (title,content) AGAINST ('+Judy +Blume' IN BOOLEAN MODE)) 
OR 
(MATCH (title,content)AGAINST ('+Elizabeth +Bowen' IN BOOLEAN MODE))) 
UNION 
(SELECT title,content,date FROM article3 WHERE 
(MATCH (title,content) AGAINST ('+Mary +Barnard' IN BOOLEAN MODE)) 
OR 
(MATCH (title,content) AGAINST ('+Patricia +Beer' IN BOOLEAN MODE)) 
OR 
(MATCH (title,content) AGAINST ('+Aphra +Behn' IN BOOLEAN MODE)) 
OR 
(MATCH (title,content) AGAINST ('+Judy +Blume' IN BOOLEAN MODE)) 
OR 
(MATCH (title,content)AGAINST ('+Elizabeth +Bowen' IN BOOLEAN MODE))) 
Order By date DESC LIMIT 10

来源

2011-04-19 cj333

我建议你切换到外部全文搜索服务器，如sphinxsearch.com。从我的经验来看，狮身人面像比mysql全文搜索快了x倍。 – 2011-04-22 08:01:46

你应该做的第一件事就是添加

Order By date DESC LIMIT 10

到每个子查询，你并不需要超过10个结果中结束。

所有表中的字段“日期”也必须有索引。

alter table "TABLENAME" add index date_idx(date);

此外：

您可能会缩短，并通过改变搜索条件，表格查询略有加快的那样： “（）|（）”

(SELECT title,content,date FROM article1 WHERE 
(cat='novel' AND MATCH (title,content) AGAINST ('(+Mary +Barnard) | (+Patricia +Beer) | (+Aphra +Behn) | (+Judy +Blume) | (+Elizabeth +Bowen)' IN BOOLEAN MODE)) 
Order By date DESC LIMIT 10) 
UNION 
(SELECT title,content,date FROM article2 WHERE 
(MATCH (title,content) AGAINST ('(+Mary +Barnard) | (+Patricia +Beer) | (+Aphra +Behn) | (+Judy +Blume) | (+Elizabeth +Bowen)' IN BOOLEAN MODE)) 
Order By date DESC LIMIT 10) 
UNION 
(SELECT title,content,date FROM article3 WHERE 
(MATCH (title,content) AGAINST ('(+Mary +Barnard) | (+Patricia +Beer) | (+Aphra +Behn) | (+Judy +Blume) | (+Elizabeth +Bowen)' IN BOOLEAN MODE)) 
Order By date DESC LIMIT 10) 
Order By date DESC LIMIT 10

来源

2011-04-22 08:04:47

@Andriy Bohdan，请原谅，是否需要将“日期”字段更改为“INDEX”。每篇文章的日期都不一样。它可以更快地帮助查询吗？谢谢。 – cj333 2011-04-22 08:26:40

@ cj333是的，它确实可以提供帮助。 – Emmerman 2011-04-22 08:32:23

有可能在日期的索引不起作用。最好的方法是使用索引测试查询，而不使用它。要查看索引是否有帮助，可以运行EXPLAIN 并检查mysql是否在日期使用索引。 – 2011-04-22 08:40:18

到您的工会另一种方法是，以作为单独的搜索进行这些。如果您按照相关性排列您的标准，那么第一组是最好的;返回部分结果，并且只有在少于10个的情况下，才能尝试下一个匹配等。

然后，查询对于最终用户来说很快，返回结果的相关顺序，并且不会浪费MySQL资源获取不需要的数据。如果用户要求更多，则可以运行更长时间的低效率查询，但这是有意义的。

来源

2011-04-22 19:08:39 boisvert

如何优化mysql全文联合搜索？

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