# Auto Increment vs. UUIDs

**URL:** <https://forums.percona.com/t/auto-increment-vs-uuids/4614>\
**Category:** Percona XtraDB Cluster 5.x\
**Created:** [December 17, 2015, 1:38pm UTC](https://forums.percona.com/t/auto-increment-vs-uuids/4614 "2015-12-17T13:38:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dbasaurus](https://avatars.discourse-cdn.com/v4/letter/d/0ea827/32.png) [@dbasaurus](https://forums.percona.com/u/dbasaurus)\
**Post date:** [December 17, 2015, 1:38pm UTC](https://forums.percona.com/t/auto-increment-vs-uuids/4614/1 "2015-12-17T13:38:48Z")

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How well does Percona XtraDB Cluster support UUIDs for primary keys?

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**Author:** ![przemek](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/przemek/32/3_2.png) [@przemek](https://forums.percona.com/u/przemek)\
**Post date:** [February 9, 2016, 4:05am UTC](https://forums.percona.com/t/auto-increment-vs-uuids/4614/2 "2016-02-09T04:05:44Z")

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PXC does no change to the way MySQL generates UUIDs, and from the general concept, a UUID should be 100% unique between the nodes, as part of if is based on hardware uniqueness, like the eth card MAC.  
See here for more details:  
[url][https://www.percona.com/blog/2014/12/19/store-uuid-optimized-way/[/url]](https://www.percona.com/blog/2014/12/19/store-uuid-optimized-way/%5B/url%5D)  
[url][MySQL :: MySQL 5.6 Reference Manual :: 12.20 Miscellaneous Functions](http://dev.mysql.com/doc/refman/5.6/en/miscellaneous-functions.html#function_uuid%5B/url%5D)