Charity Majors+ Your Authors @mipsytipsy cofounder/CTO @honeycombio, co-wrote Database Reliability Engineering, loves whiskey, rainbows, and Friday deploys. I test in production and so do you. 🌈 Jun. 05, 2019 1 min read + Your Authors

Pro Tip: when a vendor claims to handle high cardinality, don't rejoice before you ask:

* what do they mean by "handle"?
* can you break down by a hi-card dimension?
* can you break down by multiple? how many?
* do you have to index that field in advance?
* describe perf hit?

* what data types can be hi-card?
* what are the limits on those fields?
* what operations can you run on them?
* describe implications to your storage footprint,
* and costs
* what is the tested upper limit to cardinality?
* must you define schema up front?
* how wide can it be?

there are so many sneaky ways to lie with data, tests, and cute marketing slogans ("Infinite Cardinality!")

more like infinite marketing budget, lol

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