mysql索引 primary index unique fulltext 有什么区别？ mysql doc 上这么说： Indexes are used to find rows with a specific value of one column fast. Without an index MySQL has to start with the first record and then ...

I'm currently working on a particular table that is about 7 million records. Size on disk is about 2GB. It so happens that the way this is indexed, The size of the index is about double the size of ...

In an earlier tip I discussed how indexes can speed up processing. It's only fair that I also talk about when indexes don't help. First: Because indexes don't always help but do always increase the ...