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Thus, for variant 1 (that is, most UUIDs) a random version 4 UUID will have 6 predetermined variant and version bits, leaving 122 bits for the randomly generated part, for a total of 2 122, or 5.3 × 10 36 (5.3 undecillion) possible version-4 variant-1 UUIDs. There are half as many possible version 4, variant 2 UUIDs (legacy GUIDs) because ...
names or codes allocated using a regime involving multiple (concurrent) issuers of unique identifiers that are each assigned mutually exclusive partitions of a global address space such that the unique identifiers assigned by each issuer in each exclusive address space partition are guaranteed to be globally unique.
A Universally Unique IDentifier (UUID) URN Namespace: July 2005: UUID: RFC 4151 : The 'tag' URI Scheme: October 2005: Tag URI scheme: RFC 4213 : Basic Transition Mechanisms for IPv6 Hosts and Routers: October 2005: 6in4: RFC 4217 : Securing FTP with TLS: October 2005: SSL FTP (FTPS) RFC 4271 : Border Gateway Protocol 4: January 2006: Border ...
User identifier (Unix), a code identifying each user on a Unix and Unix ... Universally unique identifier (UUID) In other areas. PubMed 'Unique Identifier ...
It uses a sequence-based hi-lo pattern to generate values. Hi/Lo is used in scenarios where an application needs its entities to have an identity prior to persistence. It is a value generation strategy. An alternative to Hi/Lo would be for the application to generate keys as universally unique identifiers (UUID).
The effective UID (euid) of a process is used for most access checks.It is also used as the owner for files created by that process. The effective GID (egid) of a process also affects access control and may also affect file creation, depending on the semantics of the specific kernel implementation in use and possibly the mount options used.
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Some databases provide UUID/GUID as a possible data type for surrogate keys (e.g. PostgreSQL UUID [3] or SQL Server UNIQUEIDENTIFIER [4]). Having the key independent of all other columns insulates the database relationships from changes in data values or database design [5] (making the database more agile) and guarantees uniqueness.