29 Nov '17, 8pm

Say No to Randos (in Your Database) #ruby #rails

When I used my first ORM, I wondered “why didn’t they include a random() method?” It seemed like such an easy thing to add. While there are many reasons you may want to pull a record out of your database at random, you shouldn’t be using SQL’s RANDOM() function unless you’ll only be randomizing a limited number of records. In this post, we’ll examine how such a simple looking SQL operator can cause a lot of performance pain, and a few different techniques we can use to fix it.

Full article: https://www.schneems.com/2017/11/29/say-no-to-randos-in-y...

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