When it comes to data refresh on server there are two options either you choose to schedule the data refresh or you go live connected to database. In general data refresh frequency is not high when you set refresh scheduler as compared to live connection.
When you install Tableau sever it will ask if you want to use server cache or not. This will help in fast loading of frequently used dashboard on daily basis.
But in live database connection it will give some lag in refresh. It will still show the data from cache memory even the live back end data is refreshed.
Resolution:
Use Tag ?:refresh=yes& in your dashboard URL.
https://servername/t/sitename/views/viewname?:refresh=yes&:iframeSizedToWindow=true&:embed=y&:showAppBanner=false&:display_count=no&:showVizHome=no
By adding this tag live connected data will immediately reflect in you dashboard.
Hope this will help!
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