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How to create a #trigger that will refresh the #materialised view for every hour ?#postgresql
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About trigger and function explanation in postgresql:
In this example, the refresh_materialized_view() function is defined to refresh the my_materialized_view view. The hourly_materialized_view_refresh trigger is created to execute the refresh_materialized_view() function every hour, triggered by any changes made to the my_table.
The AFTER INSERT OR UPDATE OR DELETE clause specifies the events that will trigger the execution of the trigger. In this case, any changes made to the my_table will trigger the refresh of the materialized view.
The WITH DEFERRABLE INITIALLY DEFERRED clause ensures that the trigger is executed after the transaction that caused the trigger is completed, which can improve performance.
Note that the syntax may vary depending on the specific database management system you are using. Also, make sure that you understand the potential impacts of frequent materialized view refreshes on the performance of your database system.
About trigger and function explanation in postgresql:
In this example, the refresh_materialized_view() function is defined to refresh the my_materialized_view view. The hourly_materialized_view_refresh trigger is created to execute the refresh_materialized_view() function every hour, triggered by any changes made to the my_table.
The AFTER INSERT OR UPDATE OR DELETE clause specifies the events that will trigger the execution of the trigger. In this case, any changes made to the my_table will trigger the refresh of the materialized view.
The WITH DEFERRABLE INITIALLY DEFERRED clause ensures that the trigger is executed after the transaction that caused the trigger is completed, which can improve performance.
Note that the syntax may vary depending on the specific database management system you are using. Also, make sure that you understand the potential impacts of frequent materialized view refreshes on the performance of your database system.
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