[英]MySQL Full-Text search vs Like %%
What are key differences and what is a use case for both of them? 什么是关键差异以及它们的用例是什么? Thanks!
谢谢!
Full-text search is the kind of search based on special sort of index (full-text, obviously). 全文搜索是一种基于特殊索引的搜索(显然是全文)。 So you get the power of
O(lgN)
while searching using it. 因此,在使用它时,您可以获得
O(lgN)
的强大功能。
While like %%
always causes table fullscan which can be terrible slow (when you have 100k and more rows). 虽然
like %%
总是导致表fullscan,这可能是非常慢(当你有100k和更多行)。
Personally I use Like %%
when it is a small table (0-1000 rows) and I'm sure that it will never grow (and, important, when like %%
fits the task requirements). 我个人使用
Like %%
当它是一个小表(0-1000行)时,我确信它永远不会增长(而且,重要的是,当like %%
符合任务要求时)。
Note: fulltext indexes are available only for myisam SE. 注意:全文索引仅适用于myisam SE。 If you use innodb - then you need to look at some 3rd party indexing software like sphinx
如果你使用innodb - 那么你需要看看像sphinx这样的第三方索引软件
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