Charity Majors @mipsytipsy CTO @honeycombio, ex-Parse, Facebook, Linden Lab; cowrote Database Reliability Engineering; loves whiskey, rainbows. I test in production and so do you. 🌈🖤 Jun. 05, 2019 1 min read

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

You can follow @mipsytipsy.


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