# Is it recommended to run es aggregations during api calls, how expensive can it be? **URL:** \ **Category:** Elasticsearch\ **Created:** [March 12, 2021, 12:41pm UTC](https://discuss.elastic.co/t/is-it-recommended-to-run-es-aggregations-during-api-calls-how-expensive-can-it-be/267084 "2021-03-12T12:41:24Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![manish\_kakoti](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/manish_kakoti/32/53285_2.png) [@manish\_kakoti](https://discuss.elastic.co/u/manish_kakoti)\ **Post date:** [March 12, 2021, 12:41pm UTC](https://discuss.elastic.co/t/is-it-recommended-to-run-es-aggregations-during-api-calls-how-expensive-can-it-be/267084/1 "2021-03-12T12:41:24Z")
there are couple of scenarios that i wanted to discuss: 1. If we run aggregations (on large data sets) during REST API calls? How expensive it is experienced to be? 2. If we store pre-aggregated data(which runs during insertion of data in elastic search)? and we run queries to fetch them during API calls, can this be a great solution? thanks ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [March 12, 2021, 1:11pm UTC](https://discuss.elastic.co/t/is-it-recommended-to-run-es-aggregations-during-api-calls-how-expensive-can-it-be/267084/2 "2021-03-12T13:11:38Z")
Before doing option 2, I'd first check that there's actually a problem to solve. 1 is normally ok. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [April 9, 2021, 1:11pm UTC](https://discuss.elastic.co/t/is-it-recommended-to-run-es-aggregations-during-api-calls-how-expensive-can-it-be/267084/3 "2021-04-09T13:11:57Z")
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