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Published by Baron Schwartz on Jul 30, 2018 1:47:27 PM

What is Cardinality in Monitoring?

I wrote a couple of “definitions and nuances” posts about terminology in databases recently (cardinality, selectivity), and today I want to write one about cardinality in monitoring, as opposed to cardinality in databases. If you’ve seen discussions of “high-cardinality dimensions” or “observability requires support for high-cardinality fields” this is what we’re talking about today. So what does it mean?

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Published by Baron Schwartz on Jul 6, 2018 12:11:30 PM

What is Cardinality in a Database?

Databases have a lot of jargon, and cardinality is one of those words that experienced people tend to forget that they didn’t know once upon a time. But if you don’t know it—and it takes a while to really get comfortable with cardinality—it’s super confusing when the DBA just drops it into the middle of a sentence without slowing down! Fear not: I’ve got you, as they say.

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