| From: | John DeSoi <desoi(at)pgedit(dot)com> |
|---|---|
| To: | Evan Martin <postgresql2(at)realityexists(dot)net>, "pgsql-general(at)postgresql(dot)org general" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Way to quickly detect if database tables/columns/etc. were modified? |
| Date: | 2016-10-31 12:54:36 |
| Message-ID: | 3C423198-7167-4D3D-9C8D-DD1E6D470184@pgedit.com |
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| Lists: | pgsql-general |
> On Oct 30, 2016, at 4:45 AM, Evan Martin <postgresql2(at)realityexists(dot)net> 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.
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