# Parent-child relationship performance and global ordinals

**URL:** <https://discuss.elastic.co/t/parent-child-relationship-performance-and-global-ordinals/68788>\
**Category:** Elasticsearch\
**Created:** [December 12, 2016, 10:39pm UTC](https://discuss.elastic.co/t/parent-child-relationship-performance-and-global-ordinals/68788 "2016-12-12T22:39:46Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bamoqi](https://avatars.discourse-cdn.com/v4/letter/b/c0e974/32.png) [@bamoqi](https://discuss.elastic.co/u/bamoqi)\
**Post date:** [December 12, 2016, 10:39pm UTC](https://discuss.elastic.co/t/parent-child-relationship-performance-and-global-ordinals/68788/1 "2016-12-12T22:39:46Z")

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I was reading [Practical Considerations](https://www.elastic.co/guide/en/elasticsearch/guide/master/parent-child-performance.html) which states that:

- Parent-child queries can be 5 to 10 times slower than the equivalent nested query.

- Global ordinals needs to be rebuild after every refresh, which could take up to several seconds.

Thanks!

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<div class="post-metadata">

**Author:** ![bamoqi](https://avatars.discourse-cdn.com/v4/letter/b/c0e974/32.png) [@bamoqi](https://discuss.elastic.co/u/bamoqi)\
**Post date:** [December 30, 2016, 3:21pm UTC](https://discuss.elastic.co/t/parent-child-relationship-performance-and-global-ordinals/68788/2 "2016-12-30T15:21:08Z")

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Bumping.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 27, 2017, 3:21pm UTC](https://discuss.elastic.co/t/parent-child-relationship-performance-and-global-ordinals/68788/3 "2017-01-27T15:21:11Z")

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