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Improve support utf8mb4 by adding intermediate varchar 191 type #411

gabordemooij opened this issue Jan 2, 2015 · 1 comment


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InnoDB has a maximum index length of 767 bytes, so with utf8mb4 you can only store 191 characters. This means that when you subsequently add an index to the column you get a (not-so-obvious) MySQL-error.

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Jemt commented Apr 5, 2020

The strange length of 191 puzzled me. I appreciate that the reason was described here.

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