Re: Triggers and locking

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

--
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cut the trees and you'll see there is no forest.

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