If I read the SP list items for every 5mins using exe, will SharePoint give throttling error?

Mihir Yelamanchili I am not sure what is your business requirement but 5-10 mins is too much, if you have 200 records it will be fine, but let's say it has increased to 5000, based on what you do after getting all items can also take 5-10 items. You will probably not hit throttle limit or issues till you are less than 5000 but more than 5000 can be issue as it might cause SQL queries to lock the database which generally happens if you cross 5000. You probably know that views with 5000 items have problems so I am expecting same can happen for your app as well

https://docs.microsoft.com/en-us/sharepoint/support/lists-and-libraries/items-exceeds-list-view-threshold