Written by: ilmarkerm

Category: Blog entry

Published: August 31, 2021

I’ve been using InfluxDB for storing metrics, but it has hit its limitations – pretty huge memory consumption, so can’t really store some metrics for longer time and InfluxQL language itself is very limiting for analytics. So looking now into replacing it with Oracle 21c with JSON in-memory store and other goodies.

But InfluxDB has a nice GROUP BY time(<time interval>) clause that lets you group timestamps into arbitary length time groups – 1 minute, 2 minute, 5 minute, 15 minute, 3 hours…

In Oracle you can use built in TRUNC() or ROUND() to round timestamp into 1 MINUTE, 1 HOUR, 1 DAY, but not to 5 minute and so on.

Here are my functions to fix this issue.

Yes you are seeing correct, all TIMESTAMP data types. No DATE. Please stop using this old expired DATE data type. TIMESTAMPS are better as ISO joins are better 🙂