UUID max character length

Question

We are using UUID as primary key for out oracle DB  and trying to determine an appropriate max character length for the VARCHAR  Apparently this is 36 characters but we have noticed UUID S generated which are longer than this - up to 60 characters in length  Does anyone know a suitable max char length for UUID

User · Answer

Most databases have a native UUID type these days to make working with them easier  If yours doesn t  they re just 128-bit numbers  so you can use BINARY 16   and if you need the text format frequently  e g  for troubleshooting  then add a calculated column to generate it automatically from the binary column  There is no good reason to store the  much larger  text form

User · Answer

This is the perfect kind of field to define as CHAR 36  by the way  not VARCHAR 36  since each value will have the exact same length  And you ll use less storage space  since you don t need to store the data length for each value  just the value

User · Answer

Section 3 of RFC4122 provides the formal definition of UUID string representations   It s 36 characters  32 hex digits   4 dashes    Sounds like you need to figure out where the invalid 60-char IDs are coming from and decide 1  if you want to accept them  and 2  what the max length of those IDs might be based on whatever API is used to generate them

[oracle] UUID max character length

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