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Bytes requirement

In MySQL

A column uses one length byte if values require no more than 255 bytes, two length bytes if values may require more than 255 bytes.

UUID Storage

How many bytes does uuid have? Uuid are 128 bit value, which means they take 16 bytes of ram to hold a value. A text representation will take 32 bytes (two bytes per character), plus 4 hyphens, plus the two brackets.

Postgres datatype

https://www.postgresql.org/docs/10/datatype-numeric.html