Re: Way to quickly detect if database tables/columns/etc. were modified? - Mailing list pgsql-general
On Mon, Oct 31, 2016 at 8:54 AM, John DeSoi <desoi@pgedit.com> wrote:
> On Oct 30, 2016, at 4:45 AM, Evan Martin <postgresql2@realityexists.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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>Maybe create an event trigger that updates a simple table with the last modification time or sends a notification?
That would certainly work, but the problem is, that trigger would have to be created for every table in the database.
When you have more than a couple dozen tables, as in hundreds, it becsmes a huge undertaking.
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Melvin Davidson
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.
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