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Editorial Team
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Asked: 2026-05-15T16:01:32+00:00

I have a user table structured like this: id MEDIUMINT(7), username VARCHAR(15) Would it

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I have a user table structured like this:

  • id MEDIUMINT(7),
  • username VARCHAR(15)

Would it technically be faster if I changed it to this instead:

  • id MEDIUMINT(5),
  • username VARCHAR(15)

I’m confused because even though the total row length in terms of characters and digits would be shorter, I assume the number of bytes used would be the same.

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1 Answer

  1. Editorial Team

    I’m confused because even though the total row length in terms of characters and digits would be shorter, I assume the number of bytes used would be the same.

    You’re correct – the number of digits specified does not change the number of bytes that a MEDIUMINT column will use to hold the value. Effectively, there’s no speed performance.

    Reference:

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