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Most MySQL indexes (PRIMARY KEY, UNIQUE, INDEX, and FULLTEXT) are stored in B-trees. Exceptions: Indexes on spatial data types use R-trees; MEMORY tables also support hash indexes; InnoDBuses inverted lists for FULLTEXT indexes.
没多少内容,直接看原文吧
http://dev.mysql.com/doc/refman/5.7/en/index-btree-hash.html
、只要使用了Limit mysql 会尽力使用索引、
MySQL-Comparison of B-Tree and Hash Indexes
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原文地址:http://my.oschina.net/httpssl/blog/528211