Re: Triggers and locking

On 21 September 2010 18:39, Alban Hertroys
<dalroi(at)solfertje(dot)student(dot)utwente(dot)nl> wrote:
> On 21 Sep 2010, at 16:13, William Temperley wrote:
>
>> Dear all,
>>
>> I have a single "source" table that is referenced by six
>> specialization tables, which include:
>> "journal_article"
>> "report"
>> 4 more....
>>
>> e.g.:
>> """
>> update source set citation = get_report_citation(
>>    (select source from source where id = NEW.source_ptr_id),
>>    NEW
>> );
>> """
>
> Well, depending on how many rows are in source, updating them all can take a while.
> Eventually those changes will have to go to disk, so it's probably pretty much I/O-bound.
>
> I get the impression you're missing a WHERE clause on that UPDATE statement though, or otherwise I can't understand why you'd want to update all citations every time one source record changes.
>
>
> Alban Hertroys
>

Indeed you're right, I was just missing a WHERE clause. Failed at the
last hurdle there.

All works as intended now, thankyou.

Will Temperley