 a timestamp.
* The fourth number preserves temporal uniqueness in case the timestamp value
 loses monotonicity (for example, due to daylight saving time).
* The fifth number is an IEEE 802 node number that provides spatial uniqueness.
 A random number is substituted if the latter is not available (for example,
 because the host computer has no Ethernet card, or we do not know how to find
 the hardware address of an interface on your operating system). In this case,
 spatial uniqueness cannot be guaranteed. Nevertheless, a collision should
 have very low probability.

Currently, the MAC address of an interface is taken into account only on
FreeBSD and Linux. On other operating systems, MariaDB uses a randomly
generated 48-bit number.

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

The function generates a UUIDv1 and the results are generated according to the
"DCE 1.1:Remote Procedure Call" (Appendix A) CAE (Common Applications
Environment) Specifications published by The Open Group in October 1997
(Document Number C706).

Examples
--------

SELECT UUID();
+--------------------------------------+
| UUID()                               |
+--------------------------------------+
| cd41294a-afb0-11df-bc9b-00241dd75637 |
+--------------------------------------+

URL: https://mariadb.com/kb/en/uuid/https://mariadb.com/kb/en/uuid/