Re: Watching for view changes

[Rob Sargent <robjsargent@xxxxxxxxx>]

Is this of theoretical interest (up to and including a specification/requirement) or this a practical concern (i.e. need to know when to update somebody’s dashboard widget (but the query is too slow to simply refresh on-demand)?

On Dec 22, 2018, at 9:42 AM, Ricardo Martin Gomez <rimartingomez@xxxxxxxxxxx> wrote:

Hi, perhaps you can use triggers for some tables.

Regards.

Obtener Outlook para Android

---

From: Mitar <mmitar@xxxxxxxxx>
Sent: Saturday, December 22, 2018 1:21:49 AM
To: Kevin Brannen
Cc: pgsql-general@xxxxxxxxxxxxxxxxxxxx
Subject: Re: Watching for view changes

 

Hi!

On Thu, Dec 20, 2018 at 12:54 PM Kevin Brannen <KBrannen@xxxxxxxx> wrote:

Hmm, I guess I could see that as long as the DB wasn't too [write] busy, else you'd be flooded with notifications.

Sure. But this could be resolved by allowing notifications to be batched together. Debounce them. So could maybe configure how often you want such notifications and if they are more often they would be combined together into one.

 

Maybe it's a useful idea for you ... or maybe not. 😊

Thanks. Yes, this is one approach to do it. Hooking into every modify call at the app level and in this way have some information what is changing. I would prefer doing it in the database though, so that it could be independent from the source of the change. Moreover, not all UPDATE queries really do end up updating the data.

Mitar

--

http://mitar.tnode.com/
https://twitter.com/mitar_m