So, there’s a “SELECT 1” every 10 seconds, then another one along with a “SELECT zone_num FROM param_zone” every second.
This happens with no client opened, and only with one of several basically identical projects. We’re using MariaDB.
I have NO IDEA where those come from.
I tried searching for those terms, but found nothing.
Might anyone have a few tips on how to go about hunting queries ?
Edit your database connection on the Ignition server web page and check the ‘Show advanced properties’ checkmark at the bottom.
In the ‘Connection Testing’ section, you’ll see…
I figured the 10 seconds one might be some sort of ping (thought should it really be trying to validate a connection when we’re not even attempting to use it ? The “Test while idle?” field is disabled),
but i’m more concerned about the other query (SELECT zone_num FROM param_zone).
This one makes no sense to me !
If a system wide find doesn’t find it, I would bet it is a tag change script or a sql query tag.
Export the tag database, then open it with a text editor like Notepad++ and search for the query string.
Assuming I did things right, it’s not there either.
Just to make sure I didn’t miss something: I exported my project’s tags, which gave me a json. I then tried to grep “SELECT” in that json, which yielded nothing.
Do you have any dynamic query generating functions? Something like "SELECT % FROM %s" and perhaps its getting filled in with your two values? Query building functions can be helpful but can also make stuff like this hard to track down.
Another thing:
I have queries that are just like this one, but with WHERE clauses.
Any chance the clause might be removed somehow ?
I should add that pretty much none of the code is mine, I’m actually in the process of cleaning and fixing it…
It makes it hard to know what’s going on.
There is no way to isolate things based on their polling rate that I am aware of.
The fact that it happens with no client open and only on a particular project, indicates to me that you should be looking in a Gateway Event Script.
Gateway Event Scripts are considered a project resource and so would be isolated to a single project
They run on the gateway and so do not require any sessions or clients to be open
If these were the result of a Tag Change Script, or Query Tag Polling then it would be across all projects (unless the projects are on separate gateways).
Any script on a window would require a client to be running
Client Event Scripts require a client to be running
The fact that this is so cyclical would lead me to the Timer Events, particularly those with a 10,000ms delay/rate.
Quite a few indeed, but none of them matches this query.
I have a couple that look like it, but with extra conditions or columns, things like that.
besides, I don’t think any of them is called on such a timer, they’re supposed to be called on user interaction…
edit:
I want to thank you guys for the help, it’s very nice of you.