# What does polling mode off actually mean **URL:** \ **Category:** Ignition\ **Tags:** namedqueries, ignition80, vision, ignition81\ **Created:** [April 5, 2022, 8:09pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069 "2022-04-05T20:09:46Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![bmeyers](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bmeyers/32/37453_2.png) [@bmeyers](https://forum.inductiveautomation.com/u/bmeyers)\ **Post date:** [April 5, 2022, 8:09pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/1 "2022-04-05T20:09:46Z")
I am pretty sure I am failing to understand how polling mode works when “off”. My interpretation was if my data from the result changes then the query executes but I think it is actually only firing when my parameters update. So I added a custom parameter “refresh” that doesn’t change the query results but does get sent to the named query. Still no change in behavior. What am I not understanding correctly? ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/c/8/c8ffe0a07cde224ffc4f5c60f55591dfd31adce4.png) ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [April 5, 2022, 8:18pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/2 "2022-04-05T20:18:42Z")
Are you actually _changing_ the value of refresh? Setting `true` to `true` will probably be ignored, for instance. Regardless, you should probably be doing a `refreshBinding()` instead: [Perspective Component Methods - Ignition User Manual 8.1 - Ignition Documentation](https://docs.inductiveautomation.com/display/DOC81/Perspective+Component+Methods#PerspectiveComponentMethods-RefreshingBindings) ---
**Author:** ![dkhayes117](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/dkhayes117/32/68344_2.png) [@dkhayes117](https://forum.inductiveautomation.com/u/dkhayes117)\ **Post date:** [April 5, 2022, 8:18pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/3 "2022-04-05T20:18:57Z")
> [@bmeyers](#): > > My interpretation was if my data from the result changes then the query executes How could the result data change without a query execution? Polling mode set to `off` means the query will not update unless one of the parameters change. If you want to force trigger a refresh, the correct way to do that in a script is ```auto table = event.source.parent.getComponent('Power Table') system.db.refresh(table,'data') ``` ---
**Author:** ![dkhayes117](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/dkhayes117/32/68344_2.png) [@dkhayes117](https://forum.inductiveautomation.com/u/dkhayes117)\ **Post date:** [April 5, 2022, 8:20pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/4 "2022-04-05T20:20:05Z")
> [@paul-griffith](#): > > Regardless, you should probably be doing a `refreshBinding()` instead: [Perspective Component Methods - Ignition User Manual 8.1 - Ignition Documentation](https://docs.inductiveautomation.com/display/DOC81/Perspective+Component+Methods#PerspectiveComponentMethods-RefreshingBindings) The question is for vision I think. ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [April 5, 2022, 8:20pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/5 "2022-04-05T20:20:54Z")
Ah, yeah, so it is, I misinterpreted the dialog. Still: [system.db.refresh - Ignition User Manual 8.1 - Ignition Documentation](https://docs.inductiveautomation.com/display/DOC81/system.db.refresh) ---
**Author:** ![bmeyers](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bmeyers/32/37453_2.png) [@bmeyers](https://forum.inductiveautomation.com/u/bmeyers)\ **Post date:** [April 5, 2022, 8:21pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/6 "2022-04-05T20:21:03Z")
I was flipping true to false and false to true. The data still wasn’t updating so I am trying to locate my problem. ---
**Author:** ![dkhayes117](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/dkhayes117/32/68344_2.png) [@dkhayes117](https://forum.inductiveautomation.com/u/dkhayes117)\ **Post date:** [April 5, 2022, 8:22pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/7 "2022-04-05T20:22:01Z")
What changes are you expecting to see? Are you sure it isn’t running the query and the result set is the same? ---
**Author:** ![bmeyers](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bmeyers/32/37453_2.png) [@bmeyers](https://forum.inductiveautomation.com/u/bmeyers)\ **Post date:** [April 5, 2022, 8:26pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/8 "2022-04-05T20:26:57Z")
I thought I would get new data but I may need to toggle something else to force the new data to appear. The system.db.refresh() seems like the way to go though so I am not adding useless parameter to all my queries. I will test further and report back. ---
**Author:** ![bmeyers](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bmeyers/32/37453_2.png) [@bmeyers](https://forum.inductiveautomation.com/u/bmeyers)\ **Post date:** [April 5, 2022, 8:57pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/9 "2022-04-05T20:57:35Z")
After some testing it doesn’t seem like system.db.refresh is working… but I know why. In my setup I am not actually running the named query from the powertable. I have attached the powertable to a dataset tags custom property that is running the named query. So refreshing the table doesn’t accomplish anything (doesn’t appear to be). ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [April 5, 2022, 9:14pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/10 "2022-04-05T21:14:00Z")
Use `system.db.refresh` on the component & property that actually has the binding you wish to re-execute. (The custom property in this case.) I hope you caught @dkhayes117 comment about not seeing anything changing in a DB without executing a query. While some DB brands may have event notifications available in their connection technology, JDBC doesn’t have a universal way to expose such. ---
**Author:** ![bmeyers](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bmeyers/32/37453_2.png) [@bmeyers](https://forum.inductiveautomation.com/u/bmeyers)\ **Post date:** [April 6, 2022, 6:19pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/11 "2022-04-06T18:19:28Z")
Ok, what is the syntax to update a property on a root container? This code isn’t cutting it… ```auto system.db.refresh(event.source.parent, "data") ``` In this case my button the script is being called from is directly under the ‘Root Container’. ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [April 6, 2022, 6:20pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/12 "2022-04-06T18:20:46Z")
Is the name of the root container custom property “data” ? ---
**Author:** ![bmeyers](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bmeyers/32/37453_2.png) [@bmeyers](https://forum.inductiveautomation.com/u/bmeyers)\ **Post date:** [April 6, 2022, 6:30pm UTC](https://forum.inductiveautomation.com/t/what-does-polling-mode-off-actually-mean/58069/13 "2022-04-06T18:30:17Z")
It sure isn’t! 😓 🤦‍♂️