In control automation can database be event driven or only polled?

hi
I would like to kindly ask you about fundamental concept:
In control automation can database be event driven or only polled?

For example when we have scada which reads data from MES or ERP system inside mssql server
can this database somehow notify scada that there is new data to be queried ? If this is possible it would be great as
most of the time it is better to process data on event basis rather than constant polling to read it (which congest the network)

Regards and thanks in advance for sharing your understanding!
 
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