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Storage engine: edit TSI section

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pierwill 2020-01-08 10:55:47 -08:00
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@ -95,12 +95,9 @@ organize values for a series together into long runs to best optimize compressio
As data cardinality (the number of series) grows, queries read more series keys and become slower.
The **Time Series Index** ensures queries remain fast as data cardinality grows.
To keep queries fast as we have more data, we use a **Time Series Index**.
TSI stores series keys grouped by measurement, tag, and field.
In data with high cardinality (a large quantity of series), queries become slower.
The TSI stores series keys grouped by measurement, tag, and field.
TSI answers two questions well:
This allows the database to answer two questions well:
- What measurements, tags, fields exist?
(This happens in meta queries.)
- Given a measurement, tags, and fields, what series keys exist?