对 id 1 进行全文搜索的奇怪 mysql 行为

Question

我有一个 table (INNODB db)，其中有数千条记录，一些列是全文索引的。我在布尔模式下使用全文，它工作得很好，除了 id 为 1 的行。它总是告诉我相关性为 0，即使搜索 word/s 存在于索引列内，并且在其他行上经常找到该词.我已经检查了停用词，但这不是问题所在。这就像全文搜索在 id 为 1 的行上是盲目的。有什么建议吗？

行为示例：

SELECT *,  MATCH(full_name, short_name, long_description, summary, model) AGAINST("snom" IN BOOLEAN MODE) as relevance FROM product_sheets

结果：

id	full_name	short_name	model	long_description	summary	relevance
1	Snom phone black 12 lines	Snom phone	D385	Snom phone ..	Snom, phone	0
2	Snom phone blue 12 lines	Snom phone	D385	Snom phone ..	Snom, phone	38.311..
..	..	..	..	..	..	..

全文索引应用于片段中显示的列。

Answer 1

我无法重现您的问题，可能是您使用的版本问题，请尝试更新到可用的最新版本

CREATE TABLE product_sheets
    (`id` int, `full_name` varchar(27), `short_name` varchar(12)
    , `model` varchar(4), `long_description` varchar(15), `summary` varchar(13)
    ,FULLTEXT (full_name, short_name, long_description, summary, model))
;
    
INSERT INTO product_sheets
    (`id`, `full_name`, `short_name`, `model`, `long_description`, `summary`)
VALUES
    (1, '"Snom phone black 12 lines"', '"Snom phone"', 'D385', '"Snom phone .."', '"Snom, phone"'),
    (2, '"Snom phone blue 12 lines"', '"Snom phone"', 'D385', '"Snom phone .."', '"Snom, phone"')
;

SELECT *,  MATCH(full_name, short_name, long_description, summary, model) AGAINST("snom" IN BOOLEAN MODE) as relevance FROM product_sheets

id | full_name                   | short_name   | model | long_description | summary       |                  relevance
-: | :-------------------------- | :----------- | :---- | :--------------- | :------------ | -------------------------:
 1 | "Snom phone black 12 lines" | "Snom phone" | D385  | "Snom phone .."  | "Snom, phone" | 0.000000007543713209656744
 2 | "Snom phone blue 12 lines"  | "Snom phone" | D385  | "Snom phone .."  | "Snom, phone" | 0.000000007543713209656744

db<>fiddle here

Answer 2

（这可能会或可能不会修复索引。请尝试。）

在 OPTIMIZE TABLE 上的 page 中：

After doing substantial insert, update, or delete operations on columns that are part of a FULLTEXT index in an InnoDB table. Set the configuration option innodb_optimize_fulltext_only=1 first. To keep the index maintenance period to a reasonable time, set the innodb_ft_num_word_optimize option to specify how many words to update in the search index, and run a sequence of OPTIMIZE TABLE statements until the search index is fully updated.

（请报告它是否解决了您的问题。）

对 id 1 进行全文搜索的奇怪 mysql 行为

Strange mysql behaviour with fulltext search on id 1

mysql

innodb

full-text-search