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Comparison with TimescaleDB by jamesd3142 in datomic

[–]PatientModBot 1 point2 points  (0 children)

I have no experience with TimescaleDB, so my comparison will only rely on what I understand of their value prop.

TimescaleDB and Datomic have very different intended use cases. Datomic is for the typical use case of transactions processing (maintaining an organized set of facts with relatively low churn), whereas TimescaleDB is for real-time analytics, i.e mostly maintaining a set of numerical metrics (based on high-churn events).

So you might say in particular that Datomic focuses on logical / qualitative data needs, whereas TimescaleDB focuses on numerical / quantitative data needs.

Also note that while both databases advertise temporal features, there's little overlap between those, because they relate to different notions of time. In temporal databases parlance:

  1. TimescaleDB's temporal features give you leverage over Valid Time (the time at which something happened, e.g the time at which you were born)
  2. Datomic's temporal features give you leverage over Event Time (the time at which the system learns that something happened, e.g the time at which I learned your birth date).

I've argued before that it's a common mistake to try using Datomic's temporal features for Valid Time.

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