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innodb table single column index max length

To: "maria-discuss" <maria-discuss@xxxxxxxxxxxxxxxxxxx>
From: "butler" <zxszcaijin@xxxxxx>
Date: Mon, 17 Apr 2017 23:51:21 +0800
Feedback-id: webmail:qq.com:bgforeign:bgforeign3

we know the mysql have a limit that the max index length on a single column is 767.I want know how the 767 come from ? why not 799 or 800 etc.

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Re: innodb table single column index max length
From: Sergei Golubchik, 2017-04-17