Is MySQL index_length in bytes?

The MySQL documentation defines index_length as "The length of开发者_StackOverflow社区 the index file" but doesn't specify the unit. Is it bytes?

http://dev.mysql.com/doc/refman/5.1/en/show-table-status.html

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Yes, it is bytes. The same holds true for the other lengths in show table status. They are all in bytes:

Avg_row_length
Data_length
Max_data_length
Index_length