should i use php uuid or mysql uuid function

#Should i use php uuid or mysql uuid function plus
#Should i use php uuid or mysql uuid function mac

It would belong in a RFC about generating randomness. In that situation, I don't think that algorithm belongs in a RFC describing methods for generating unique values. If that is true, than you have a very GOOD chance of two machines in the world eventually creating the same 'UUID'v4 (quotes because there isn't a mechanism for guaranteeing U.niversal U.niqueness). from reading RFC4122, it looks like that version does NOT eliminate possibility of collisions. To be honest, I don't understand why UUIDv4 exists. This is appropriate for a transaction ID (even if everyone is doing millions of transactions/s).

#Should i use php uuid or mysql uuid function plus

UUIDv1 uses the current timestamp, plus a machine identifier, plus some random-ish stuff to make a number that will never be generated by that algorithm again. It is meant to be UNIQUE, not un-guessable. If you want a unique identifier with effectively 0.00.many more 0s here.001% chance of collision, you should use UUIDv1.

If you want a random number, use a random number library. This is the more secure and generally recommended version. Version 5: This generates a unique ID from an SHA-1 hash of a namespace and name. If are dealing with very strict resource requirements (e.g. Version 3: This generates a unique ID from an MD5 hash of a namespace and name. If you are interacting with other systems, this choice was already made and you should check with version and namespaces they use. If you need to generate reproducible UUIDs from given names, you want a version 3 or version 5. The advantage of this version is that when you're debugging and looking at a long list of information matched with UUIDs, it's quicker to spot matches. If you just need to generate a UUID, this is probably what you want. Version 4: These are generated from random (or pseudo-random) numbers. The advantage of this version is that, while looking at a list of UUIDs generated by machines you trust, you can easily know whether many UUIDs got generated by the same machine, or infer some time relationship between them. If any of these things is sensitive in any way, don't use this.

#Should i use php uuid or mysql uuid function mac

Version 1: This generates a unique ID based on a network card MAC address and current time. If you just need a unique ID, you want a version 1 or version 4. Two UUIDs can never be the same even if the function is run on two different devices.Ī UUID value in MySQL is a 128-bit number represented as a utf8 string of five hexadecimal numbers separated by a ‘-’.There are two different ways of generating a UUID. The MySQL UUID() function is used to return a Universal Unique Identifier (UUID) generated according to RFC 4122, “A Universally Unique IDentifier (UUID) URN Namespace”.Ī key point to note about UUIDs is that they are designed such that they are globally unique in space and time. It provides us with the MySQL UUID() function. There are many ways you can do this – manually using random numbers taking care that the value doesn’t repeat and so on. Suppose you have a MySQL table of people and you have been tasked with assigning each one of them a unique identifier. Applications extend from your exam seat numbers to your Aadhar Card numbers/SSN Numbers and so on. You must have heard of unique identification numbers or identifiers. In this tutorial, we will study the MySQL UUID() function.