Обсуждение: detaching triggers

Hi folks,

is it somehow possible to detach trigger, so the calling transaction
can return immediately, even before the trigger function has 
returned. 

I've got to do some quite complex things which may need some time, 
when some clients fill in some data, but the results are quite
uninteresting to these clients - its important that the client's 
query is finished as fast as possible.

The only solution I currently know is to fill somethings in a queue 
table by rule and have an external daemon looking at it every second.
But this doesnt seem very optimal for me.

Any better idea out these ?


thx
-- 
---------------------------------------------------------------------Enrico Weigelt    ==   metux IT service
 phone:     +49 36207 519931         www:       http://www.metux.de/ fax:       +49 36207 519932         email:
contact@metux.decellphone: +49 174 7066481
 
----------------------------------------------------------------------- DSL ab 0 Euro. -- statische IP -- UUCP --
Hosting-- Webshops --
 
---------------------------------------------------------------------

On Sun, 27 Mar 2005 17:41:02 +0200, Enrico Weigelt <weigelt@metux.de> wrote:
> 
> Hi folks,
> 
> is it somehow possible to detach trigger, so the calling transaction
> can return immediately, even before the trigger function has
> returned.

No, but see below.

> The only solution I currently know is to fill somethings in a queue
> table by rule and have an external daemon looking at it every second.
> But this doesnt seem very optimal for me.

Take a look at the LISTEN/NOTIFY interfaces in the docs.  This will
allow async post-transaction processing.  You can set up an ALSO rule
to notify when a particular type of statement has executed against
your target table.

http://www.postgresql.org/docs/8.0/static/sql-listen.html
http://www.postgresql.org/docs/8.0/static/sql-notify.html

See the bottom of:
http://www.postgresql.org/docs/8.0/static/sql-createrule.html

Hope that helps!

-- 
Mike Rylander
mrylander@gmail.com
GPLS -- PINES Development
Database Developer
http://open-ils.org