RollupDB Adds SQL, Automatic Rollups and Streams That Can Change

Sat, 17 Oct 2026 00:00:00 +0000

RollupDB 0.4.0 is out. Since the first release three things have been added, one per version: rollups that run on their own, stream definitions you can change after the fact, and a read-only SQL interface over the retained buckets. Each one came out of the same question: what does someone need on day thirty that they didn’t need on day one?

The short answer is that people forget to run advance, they find out their retention was wrong, and they want to ask questions the JSON query wasn’t shaped for. So now rollupdb serve rolls up every stream once a minute, a stream can take a new version with different retention or an added sketch, and every stream is a SQL view.

RollupDB Launches as an Open Source Database for Years of Statistics

Sat, 17 Oct 2026 00:00:00 +0000

RollupDB 0.1 is out, under the Apache License 2.0. It’s an aggregate database in one file: you tell it which statistics matter, and it keeps those for years while it lets the raw events go. Seconds fold into minutes, minutes into hours, hours into days. A query a year later still gets the right count, the right extremes and a percentile with a stated error.

The pitch is simple, and the numbers are what make it worth trying. In the recorded test, five years of readings from two services, 2.8 million of them, took 207 MB as raw JSON lines. The RollupDB file holding all of it was 15.4 MB, with seconds for the last day, minutes for the last day, hours for the last week and a bucket per day going back the full five years.

Release on RollupDB.com

RollupDB Adds SQL, Automatic Rollups and Streams That Can Change

RollupDB Launches as an Open Source Database for Years of Statistics