Query tag threading - Shared or dedicated?

Ignition
1

Hi all,

I am currently trying to use Query tags for pulling my data out of databases.
The tag itself is pulling data out based on some last row timestamps, and whenever there is a change in the dataset (the output from the SQL query), then it will push this data into a JSON format which will be sent to another tag.

I could not find any information on how the threading is done in the tag browser for these Query tags. Are they running with a shared or dedicated threading?
The old way I had of running these SQL queries, were inside the Gateway event timer, and then I had a project library function which would do the conversion from SQL output to the desired JSON payload. For this old way, I could choose to have either a shared and dedicated threading on the gateway event timer scripts, but I am not able to see such an option when I create the query tags.

Thank you in advance, and please let me know if I need to post a more elaborate explanation to this topic, or if I need to add any pictures regarding my issue.

Best regards,
Benjamin

2

There is a shared thread pool for query tags (and expression tags), similar to but separate from the pool for tag event scripts (IIRC). Why did you abandon the robust way of using a timer event?

3

Thank you for you answer, Phil Turmel!

The reason for the new way was because I had to create a new custom solution for a customer, but the scope of the task was changed midway through, so it would actually be possible to have the query etc. running the old way.