Unlike v1 or v4, UUID v5 is generated by providing two pieces of input information: If you want a unique ID that’s not random, UUID v5 could be the right choice. UUIDs are just 128 bit pieces of data, that is displayed as (128/4) = 32 hexadecimal digits, like this : ba6eb330-4f7f-11eb-a2fb-67c34e9ac07cĪt first glance UUID v1 and v4 look the same, but try regenerating them and the difference will be more apparent. This is a tradeoff between uniqueness and randomness, and something that the different UUID versions solve in different ways. How do you ensure that there is just one copy of the identifier you made, and no more? And even then, how do you make sure that there is no correlation between any two identifiers? However, ensuring uniqueness is a challenge in itself. UUIDs address the problem of generating a unique ID - either randomly, or using some data as a seed. The “Universally unique identifier”, or UUID, was designed to provide a consistent format for any unique ID we use for our data. Having a unique identifier is an important requirement in many applications today. We will go through their implementation and differences, and when you should use them. This post will describe UUID v1, v4, and v5, with examples. A Complete Guide to UUID Versions (v1, v4, v5) - With Examples Updated on January 05, 2021
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