The Ultimate Guide to High Availability with MariaDB

UUIDv4

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MariaDB starting with 11.7

From MariaDB 11.7, it is possible to generate UUIDv4 and UUIDv7, in addition to UUIDv1.

Syntax

UUID_v4()

Contents

  1. Syntax
  2. Description
  3. Examples
  4. See Also

Description

Returns a Universally Unique Identifier (UUID) version 4. To generate a version 1 UUID, see the UUID function. To generate a version 7 UUID, see UUIDv7.

A UUID is designed as a number that is globally unique in space and time. Two calls to UUID() are expected to generate two different values, even if these calls are performed on two separate computers that are not connected to each other.

UUID_v4() results are intended to be unique, but cannot always be relied upon to be unpredictable and unguessable.

A UUID is a 128-bit number represented by a utf8 string of five hexadecimal numbers in aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee format:

Statements using the UUID_v4() function are not safe for statement-based replication.

Examples

SELECT UUID(),UUID_v4(),UUID_v7()\G 
*************************** 1. row ***************************
  UUID(): 63ae8c92-799a-11ef-98b2-f859713e4be4
UUID_v4(): a2443495-1b94-415b-b6fa-fe8e79ba4812
UUID_v7(): 01921e85-f198-7490-9b89-7dd0d468543b

CREATE TABLE t1 (a int primary key not null, u UUID DEFAULT UUID_v4(), unique key(u));

See Also

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