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IS.UUID.V4: UUID V4 Random Generation


Summary

A Universally Unique Identifier (UUID) is an identifier standard used in many non-MultiValue databases and software to generate a Unique ID outside of using incremental numbers. A UUID is simply a 128-bit unique value that can be expressed as either a larger number or a string.

The common format for a UUID is a string format that looks like the following:

123e4567-e89b-12d3-a456-426655440000

The intent of a UUID is to generate an ID that can be used across different databases, and will always be unique. This is different from a sequential number that would only be unique in the file or table itself, and not across files, accounts, or databases.

There are several different versions of UUID. This article is based around the Version 4 of the RFC 4122 specification for UUIDs. Version 4 is used to generate a Unique ID based on random number generation.

Version 4 is also commonly referred to as a GUID. While a GUID doesn't follow the same specification as UUIDs, it is the same basic format.

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