testing
How RollupDB Was Tested With Killed Processes and an Outside Reference
A database that throws data away on purpose had better be right about what it keeps. So RollupDB’s tests ask two questions over and over. Is the answer the same one …
Posts
release
RollupDB Adds SQL, Automatic Rollups and Streams That Can Change
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 …
release
RollupDB Launches as an Open Source Database for Years of Statistics
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 …
explainer
What an Aggregate Database Keeps When the Raw Events Are Gone
Most databases keep what you put in. An aggregate database doesn’t. It keeps what you’ll ask about later, and only that. You tell it up front: for this stream …
project
Why the Project Is Called RollupDB
A rollup is what monitoring people have called this for decades. You take sixty one-second readings and roll them up into one minute. Then sixty minutes into an hour, and …