How long should a GUID be?

16 bytes
A GUID is a 128-bit integer (16 bytes) that can be used across all computers and networks wherever a unique identifier is required.

How long is a GUID as string?

That’s 36 characters in any GUID–they are of constant length. You can read a bit more about the intricacies of GUIDs here. You will need two more in length if you want to store the braces. Note: 36 is the string length with the dashes in between.

How long is a GUID as Base64?

We found that converting the Guid (16 bytes) to an ASCII representation using Base64 resulted in a useable and still unique messageID of only 22 characters.

How many characters are GUIDs?

36 characters
The valid GUID (Globally Unique Identifier) must specify the following conditions: It should be a 128-bit number. It should be 36 characters (32 hexadecimal characters and 4 hyphens) long.

What is the size of Uniqueidentifier?

Because the uniqueidentifier type is limited to 36 characters, the characters that exceed that length are truncated.

Are GUIDs always the same length?

So the answer is “yes”, it will always be the same length. As for the 4, it is a version number (according to http://en.wikipedia.org/wiki/Uuid). Every GUID that you generate with that algorithm will have a 4 in that position, but older GUIDs will have a 1, 2, or 3.

How long is a UUID?

Universally Unique Identifiers, or UUIDS, are 128 bit numbers, composed of 16 octets and represented as 32 base-16 characters, that can be used to identify information across a computer system. This specification was originally created by Microsoft and standardized by both the IETF and ITU.

What is SQL Uniqueidentifier?

Uniqueidentifier is a Microsoft SQL Server data type that is used to store Globally Unique Identifiers (GUIDs). It can store 16 bytes of data. The Developer tool treats the Uniqueidentifier data type as String. To move or change Uniqueidentifier data, connect the Uniqueidentifier column to a String column.

Do GUIDs ever repeat?

Technically they are 128-bit unique reference numbers used in computing which are highly unlikely to repeat when generated despite there being no central GUID authority to ensure uniqueness.

Is UUID always 36?

Universally Unique Identifiers, or UUIDS, are 128 bit numbers, composed of 16 octets and represented as 32 base-16 characters, that can be used to identify information across a computer system.