Re: Way to quickly detect if database tables/columns/etc. were modified?

> On Oct 30, 2016, at 4:45 AM, Evan Martin  wrote:
> 
> If I have a query that reads from system tables like pg_class, pg_namespace, pg_attribute, pg_type, etc. and I'd like to cache the results in my application is there any fast way to detect when any changes have been made to these system catalogs? I don't  need to know exactly what has changed. Some kind of a global "database version" would do, just so I know that I need to invalidate my cache (the database definition is rarely modified in practice).

Maybe create an event trigger that updates a simple table with the last modification time or sends a notification?

https://www.postgresql.org/docs/current/static/sql-createeventtrigger.html

John DeSoi, Ph.D.