History Sampling 1s but stuck at 10s

[kieran.hanrahan]

Hi, I've set history sample rate to 1 second on tags, but the most frequent the history will store is 10 seconds.

I'm using a Postgres database as the tag history provider and can't find any settings in the database, or store-and-forward config, which would cause this limit.

I've tried a few options such as using polled vs on-change vs tag group sampling and updated the Default and Default Historical tag groups to have 1 second min or max-sampling but still 10s samples.

Tried restarting the gateway service, not seeing any performance issues, or logs indicating bottlenecks. Hoping to have some insight into this issue.
Cheers, Kieran.

[Transistor]

What's your tag group and what's its rate?

The historian won't save changes if it doesn't know about them.

[kieran.hanrahan]

Hi Transistor, thanks for your reply.
The Tag Group for that tag is "Default" and has these settings:

The tag itself had "on-change" but I've changed it back to "Tag Group" - "Default Historical" with these settings:

In typing this response I think I have found what is happening:
A new record gets created each time the history config of a tag changes:

There are multiple batches of history for the same tag spread across multiple "tagid"s with different sample rates now. This one tagid = 969 is 1second: