關於「Mysql index unique performance」標籤，搜尋引擎有相關的訊息討論：

Making an index a unique index in very large MySQL table within ...dba.stackexchange.com › questions › making-an-index-a-...Are there performance differences in queries with UNIQUE NON ...stackoverflow.com › questions › are-there-performance-di...MySQL 8.0 Reference Manual :: 1