Re: tsvector_update_trigger performance? - Mailing list pgsql-performance

On Wed, 24 Jun 2009, Chris St Denis wrote:

> Is tsvector_update_trigger() smart enough to not bother updating a tsvector
> if the text in that column has not changed?

no, you should do check yourself. There are several examples in mailing lists.

>
> If not, can I make my own update trigger with something like
>
>   if new.description != old.description
>       return tsvector_update_trigger('fti_all', 'pg_catalog.english',
>   'title', 'keywords', 'description');
>   else
>       return new;
>
> or do I need to do it from scratch?
>
>
> I'm seeing very high cpu load on my database server and my current theory is
> that some of the triggers may be causing it.
>

     Regards,
         Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83