On Sun, 8 Aug 2004 08:19, Alvaro Herrera wrote:
> If the change is global, what should happen on other sessions that have
> a deferred event from that trigger concurrently with the one that
> modifies it? Should the answer be different depending on the isolation
> mode of the transaction?
This was my other question.... It depends on how we are going to treat the
trigger already on the deferred stack... Are we going to execute the trigger
as if its status wasn't changed or are we going to double check its status
just before executing the trigger body ??
> Also, should the change be permanent, or should it be undone when the
> modifying backend exits (or the transaction ends)?
>
> I don't think it makes a lot of sense to be changing triggers globally.
> Usually you want to change it only to do a certain operation, without
> worrying about concurrent transactions.
My preference is for the change being permanent... Sure in most cases the
user would want the trigger disabled for certain operations.. But there would
be scnearios where the user would want it not be executed for a longer period
of time... In either cases the user is the best one to know when to enable
the trigger back...
Rgds,
Arul
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