Atitit in-depth understanding of uuid meaning is a universal unique identifier (universally unique Identifier),

atitit in- depth understanding The uuid meaning is a universal unique identifier (universally unique Identifier),

UUID 1

function 1

composition 1

Globally unique identifier (GUID) 2

UUID

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The uuid meaning is a universal unique identification code (universally unique Identifier), which is a standard for software construction and is Open Source software the organization of the Foundation (Open Software Foundation, OSF) is applied in Distributed computing Environment (Distributed Computing Environment, DCE) part of the field

function

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The purpose of the UUID is to make Distributed Systems All of the elements in the system can have unique identification information without the need to specify the identification information through the central control terminal. In this way, everyone can create a UUID that does not clash with others . In such a case, there is no need to consider the name duplication problem when the database is established. Currently the most widely used UUID is Microsoft's globally Unique Identifiers (GUIDs), while other important applications are the Linux ext2/ext3 file system, LUKS encryption partition, GNOME, KDE, Mac OS X, and so on.

composition

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A uuid is a number generated on a machine that guarantees that all machines in the same time and space are unique. Typically, the platform provides the generated APIs. Based on standard calculations developed by the Open Software Foundation (OSF), Ethernet card addresses, nanosecond-seconds, chip ID codes, and many possible numbers are used

The UUID is composed of the following parts:

(1) The current date and time, the first part of the UUID is related to the time, if you generate a UUID after a few seconds to generate a UUID, then the first part is different, the rest is the same.

(2) clock sequence.

(3) Globally unique IEEE machine identification number, if there is a network card, from the network card MAC address obtained, no network card in other ways to obtain

Globally unique identifier (GUID)

The universal unique identifier can also be used to point to most possible objects. Microsoft and some other software companies are inclined to use the global Unique identifier ( GUID) This is also a type of generic unique identifier that can be used to point to the Build object module object and other software component NCS) and subsequently becomes Open Software Foundation ( OSF) ( The DCE) component.

The UUID similarities and differences of the Java C #. Net namespace.

ID This is the UUID of the first six-digit address code plus the timecode:

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Atitit in-depth understanding of uuid meaning is a universal unique identifier (universally unique Identifier),