KDB+ is the number 1 time-series database, no question. Per-core, it's 10 times faster than any other time-series database. Seems like an odd omission.
> Only free and open source time series databases and their features have been compared. Therefore if someone asks “have you tried Kdb+ or Informix?” the answer will be no. They are probably awesome though.
Article could have been titled "Review of the Top10 FOSS Time Series Databases" since that's what it is.
I agree that any comparison skipping it is meaningless, it is the "standard" in this space, to the extent there is one.
Only for non-commercial use: https://kx.com/2015/09/19/32-bit-kdb-for-non-commercial-use-...
Requiring a schema makes it ill-suited to many use cases since in many situations you don't know the schema ahead of time. And the biggest for me is poor Hadoop/Spark integration. JDBC is not a great choice since you have poor predicate pushdown support and it prevents say Spark from going specifically to the node with the data.