MySQL -- index of MyISAM storage engine

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One 、 file

frm： Table structure file
MYI：index, Index file , Store index
MYD：data, Data files , Store data records

Index and data are two separate files .

Two 、 How to find data according to index ？

MyISAM Of B+Tree Inside , The leaf node stores the disk address corresponding to the data file .
So from the index file .MYI In looking for After the key value , Will go to the data file .MYD Get the corresponding data record in .