# Choice of unique document id and performance **URL:** \ **Category:** Elasticsearch\ **Created:** [November 24, 2016, 10:28am UTC](https://discuss.elastic.co/t/choice-of-unique-document-id-and-performance/67086 "2016-11-24T10:28:01Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![avaneeshr](https://avatars.discourse-cdn.com/v4/letter/a/85f322/32.png) [@avaneeshr](https://discuss.elastic.co/u/avaneeshr)\ **Post date:** [November 24, 2016, 10:28am UTC](https://discuss.elastic.co/t/choice-of-unique-document-id-and-performance/67086/1 "2016-11-24T10:28:01Z")
Hi, I am indexing around 100M webpages (HTML). I assign the document ID as the SHA256 of the url while indexing. Considering that my usage would be search query intensive (full-text, no aggregations etc.), would my choice of doc id impact query performance in any way? Thank you ---
**Author:** ![jpountz](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jpountz/32/45836_2.png) [@jpountz](https://discuss.elastic.co/u/jpountz)\ **Post date:** [November 25, 2016, 3:08pm UTC](https://discuss.elastic.co/t/choice-of-unique-document-id-and-performance/67086/2 "2016-11-25T15:08:06Z")
the choice of doc id can impact index performance, but not search performance. ---
**Author:** ![avaneeshr](https://avatars.discourse-cdn.com/v4/letter/a/85f322/32.png) [@avaneeshr](https://discuss.elastic.co/u/avaneeshr)\ **Post date:** [November 25, 2016, 3:27pm UTC](https://discuss.elastic.co/t/choice-of-unique-document-id-and-performance/67086/3 "2016-11-25T15:27:09Z")
Thanks a lot for your reply Adrien! ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 23, 2016, 3:27pm UTC](https://discuss.elastic.co/t/choice-of-unique-document-id-and-performance/67086/4 "2016-12-23T15:27:21Z")
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