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blog.timescale.com (opens on the source site)LinkedIn X
13Posts tracked
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Time-Series Cardinality: Why One More Indexed Column Costs More Than a Million More Rows (opens on the source site)

Cardinality is a consequence of how many dimensions you index your readings by. Here is where the curve bends, measured, and what you can do about it without leaving Postgres. Someone adds a firmware_ver column to the sensor table. It is one line of DDL, and it clears review in a minute. Two weeks later, the ingest job is missing its window, a dashboard query that used to return in milliseconds takes seconds, and the on-call engineer is digging through EXPLAIN output to work out when the planne

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