Global Unique IDs (GUIDs) - Revision history

Designing Buildings at 09:08, 14 October 2021

2021-10-14T09:08:43Z

← Older revision		Revision as of 09:08, 14 October 2021
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	However, the GUID itself may be larger than the database item it is keeping track of.		However, the GUID itself may be larger than the database item it is keeping track of.

−	= ~~Find out more~~ =	+	= Related articles on Designing Buildings =

−	~~=== Related articles on Designing Buildings Wiki ===~~	+	* Barcode.
−		+
−	* ~~Bluetooth~~.	+
	* BIM collaboration format BCF.		* BIM collaboration format BCF.
	* CAT5.		* CAT5.
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	* Ethernet.		* Ethernet.
	* Extranet.		* Extranet.
		+	* Identification data.
	* Information and communications technology.		* Information and communications technology.
	* Information manager.		* Information manager.
	* Knowledge management.		* Knowledge management.
	* LEXiCON.		* LEXiCON.
−	* ~~Local area network~~.	+	* QR code.

−	[[Category:DCN_Definition]] [[Category:DCN_Group]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Standard~~]] [[Category:BIM~~]] [[Category:Standards_/_measurements]] [[Category:Construction_management]] [[Category:Products_/_components]]	+	[[Category:DCN_Definition]] [[Category:DCN_Group]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Standard]] [[Category:Standards_/_measurements]] [[Category:Construction_management]] [[Category:Products_/_components]] [[Category:BIM]]

Designing Buildings at 07:38, 24 November 2020

2020-11-24T07:38:48Z

← Older revision		Revision as of 07:38, 24 November 2020
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	* Local area network.		* Local area network.

−	[[Category:~~Standards_/_measurements~~]] [[Category:DCN_Standard]] [[Category:~~Construction_management~~]] [[Category:~~Products_~~/~~_components~~]] [[Category:~~DCN_Product_Knowledge~~]] [[Category:~~BIM~~]]	+	[[Category:DCN_Definition]] [[Category:DCN_Group]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Standard]] [[Category:BIM]] [[Category:Standards_/_measurements]] [[Category:Construction_management]] [[Category:Products_/_components]]

Designing Buildings at 15:19, 7 June 2017

2017-06-07T15:19:15Z

← Older revision		Revision as of 15:19, 7 June 2017
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	* Local area network.		* Local area network.

−	[[Category:Standards_/_measurements]] [[Category:Construction_management]] [[Category:Products_/_components]]	+	[[Category:Standards_/_measurements]] [[Category:DCN_Standard]] [[Category:Construction_management]] [[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]] [[Category:BIM]]

Editor at 12:41, 6 June 2017

2017-06-06T12:41:55Z

← Older revision		Revision as of 12:41, 6 June 2017
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	* Information manager.		* Information manager.
	* Knowledge management.		* Knowledge management.
		+	* LEXiCON.
	* Local area network.		* Local area network.

	[[Category:Standards_/_measurements]] [[Category:Construction_management]] [[Category:Products_/_components]]		[[Category:Standards_/_measurements]] [[Category:Construction_management]] [[Category:Products_/_components]]

86.173.158.237 at 14:51, 5 June 2017

2017-06-05T14:51:20Z

← Older revision		Revision as of 14:51, 5 June 2017
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−	Global ~~unique~~ IDs (GUIDs) are ~~enormous~~ 128-bit numbers ~~that are~~ used to identify information ~~in computer systems~~, helping to reference ~~items~~ unambiguously.	+	Global Unique IDs (GUIDs, sometimes referred to as universally unique identifiers or UUIDs) are 128-bit numbers used to identify digital information, helping to reference them unambiguously. They are similar to the ISBN numbers used for books.

−	~~They are similar to the ISBN numbers that are traditionally used for books, VINs used for cars and National Insurance numbers used for individuals.~~	+	Because they are so large, GUIDs are virtually guaranteed to be unique. They are formatted in a well-defined sequence of 32 hexadecimal digits grouped as 8-4-4-4-12. This provides roughly 10^38 numbers. An example of how a GUID looks in hexadecimal:
−		+
−	Because they are so large, GUIDs are ~~nearly~~ guaranteed to be unique. They are formatted in a well-defined sequence of 32 hexadecimal digits grouped as 8-4-4-4-12. This provides roughly 10^38 numbers~~, or 2^138~~. An example of how a GUID looks in hexadecimal:	+

	30dd879c-ee2f-11db-8314-0800200c9a66		30dd879c-ee2f-11db-8314-0800200c9a66

−	The ~~idea behind GUIDs is that the~~ probability of any two ~~numbers 39 digits in length~~ being the same is very low. ~~Also,~~ GUIDs can be used ~~for~~ anything ~~and are not tied to particular~~ products, ~~i.e. books, cars~~, webpages, etc.	+	The probability of any two GUID's being the same is very low.
		+
		+	GUIDs can be used to identify information about anything, such as products, papers, webpages, etc.

−	The general types of GUIDs are ~~as follows~~:	+	The general types of GUIDs are:

−	* Random: ~~Random~~-number generator creates a 128-bit number.	+	* Random: A random-number generator creates a 128-bit number.
	* Time-based: Based on the current time.		* Time-based: Based on the current time.
−	* Hardware-based: Certain ~~chunks~~ of the GUID based on the hardware features, although this removes part of the anonymity of the number.	+	* Hardware-based: Certain parts of the GUID are based on the hardware features, although this removes part of the anonymity of the number.
−	* Content-based: Based on a hash of the file contents. This can be used if duplicate files ~~are required~~ to have the same GUID.	+	* Content-based: Based on a hash of the file contents. This can be used if duplicate files need to have the same GUID.

	Some of the common uses for GUIDs are as follows:		Some of the common uses for GUIDs are as follows:

	* Unique primary key in databases (allowing database items to be merged without conflict).		* Unique primary key in databases (allowing database items to be merged without conflict).
−	* Unique ~~filename~~ for uploaded files.	+	* Unique filenames for uploaded files.
−	* Unique ~~name~~ for resources.	+	* Unique names for resources.
−	* ~~Vendors are able to create and register unique~~ IDs.	+	* Unique IDs for products.
−	* ~~Architects and designers can assign GUIDs to~~ design files ~~and~~ models.	+	* Unique IDs for design files or models.

−	The advantages of GUIDs are that there is ~~not~~ central authority ~~which avoids the~~ need for management. ~~In order for an organisation to keep track of what has been assigned,~~ GUIDs can be generated internally and ~~then distributed around the organisation. GUIDs can also be~~ merged ~~easily~~ from different data sources with a low chance of any conflict.	+	The advantages of GUIDs are that there is no central authority, and so no need for management. GUIDs can be generated internally and merged from different data sources with a low chance of any conflict.

−	~~The disadvantages of GUIDs are that~~, ~~although time is saved in merging, more space is required to store~~ the ~~16-byte~~ GUID ~~which~~ may be larger than the item ~~in the database that~~ it is keeping track of.	+	However, the GUID itself may be larger than the database item it is keeping track of.

	= Find out more =		= Find out more =

Editor: Created page with "Global unique IDs (GUIDs) are enormous 128-bit numbers that are used to identify information in computer systems, helping to reference items unambiguously. They are similar to t..."

2017-06-05T11:30:49Z

Created page with "Global unique IDs (GUIDs) are enormous 128-bit numbers that are used to identify information in computer systems, helping to reference items unambiguously. They are similar to t..."

New page

Global unique IDs (GUIDs) are enormous 128-bit numbers that are used to identify information in computer systems, helping to reference items unambiguously.

They are similar to the ISBN numbers that are traditionally used for books, VINs used for cars and National Insurance numbers used for individuals.

Because they are so large, GUIDs are nearly guaranteed to be unique. They are formatted in a well-defined sequence of 32 hexadecimal digits grouped as 8-4-4-4-12. This provides roughly 10^38 numbers, or 2^138. An example of how a GUID looks in hexadecimal:

30dd879c-ee2f-11db-8314-0800200c9a66

The idea behind GUIDs is that the probability of any two numbers 39 digits in length being the same is very low. Also, GUIDs can be used for anything and are not tied to particular products, i.e. books, cars, webpages, etc.

The general types of GUIDs are as follows:

* Random: Random-number generator creates a 128-bit number.
* Time-based: Based on the current time.
* Hardware-based: Certain chunks of the GUID based on the hardware features, although this removes part of the anonymity of the number.
* Content-based: Based on a hash of the file contents. This can be used if duplicate files are required to have the same GUID.

Some of the common uses for GUIDs are as follows:

* Unique primary key in databases (allowing database items to be merged without conflict).
* Unique filename for uploaded files.
* Unique name for resources.
* Vendors are able to create and register unique IDs.
* Architects and designers can assign GUIDs to design files and models.

The advantages of GUIDs are that there is not central authority which avoids the need for management. In order for an organisation to keep track of what has been assigned, GUIDs can be generated internally and then distributed around the organisation. GUIDs can also be merged easily from different data sources with a low chance of any conflict.

The disadvantages of GUIDs are that, although time is saved in merging, more space is required to store the 16-byte GUID which may be larger than the item in the database that it is keeping track of.

= Find out more =

=== Related articles on Designing Buildings Wiki ===

* Bluetooth.
* BIM collaboration format BCF.
* CAT5.
* Common data environment.
* Data drop.
* Document control.
* Ethernet.
* Extranet.
* Information and communications technology.
* Information manager.
* Knowledge management.
* Local area network.

[[Category:Standards_/_measurements]] [[Category:Construction_management]] [[Category:Products_/_components]]