Search the practice set

126 questions, 454 terms and 400 topics in 20 areas.

6 results for “Cardinality”

Terminology · 3

Cardinality

The number of distinct time series produced by a metric, which is the product of the distinct values of all its labels — and the main driver of monitoring cost.

Observability term

Cardinality Estimation

The planner's prediction of how many rows each step of a query will produce — the input that determines every other choice it makes.

Query Optimisation term

Index Selectivity

The fraction of rows a predicate eliminates — the property that determines whether an index is worth using at all.

Indexing

Questions · 1

quiz

Your observability bill is now 40% of your compute bill. Leadership wants it cut in half without going blind. What do you cut?

What the interviewer is testing Whether you understand what each telemetry type is for , so you can cut the redundant parts rather than cutting uniformly — whic

Observability

Topics · 2

topic

Cardinality

The label that multiplies series count and the bill with it.

Observability — no content yet topic

Observability Cost

Telemetry bills, cardinality control and retention tiering.

Cost Architecture & FinOps — no content yet