How does a table row insert trigger an event to application layer?

Application component 1(ap1) record/insert a new entry(event) in DB table.

Database supports triggers & Stored procedures functioanlity.

For every new entry in a table, application component 2(ap2) needs to be informed that a new entry(event) is made in a table. ap2 would not like to poll database to find new entries.

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What is the design pattern to make ap2 listen to any new event(immediately) on a database table? without polling...