On 9 March 2012 15:05, Tom Lane <t...@sss.pgh.pa.us> wrote: > Robert Haas <robertmh...@gmail.com> writes: >> On Fri, Mar 9, 2012 at 9:22 AM, Thom Brown <t...@linux.com> wrote: >>> Sorry, I meant any command trigger. It's because none of the commands >>> can be run on a standby, so the triggers don't seem appropriate. > >> I'm not convinced. Right now, it's fairly useless - all the triggers >> could possibly do is throw an error, and an error is going to get >> thrown anyway, so it's only a question of which error message the user >> will see. But we discussed before the idea of adding a capability for >> BEFORE triggers to request that the actual execution of the command >> get skipped, and then it's possible to imagine this being useful. > > Um, surely the "you can't do that in a read-only session" error is going > to get thrown long before the command trigger could be called?
Yes, at the moment that's the case. I said that this wasn't the case for utility commands but I've noticed the message is different for those: ERROR: cannot execute VACUUM during recovery vs ERROR: cannot execute CREATE TABLE in a read-only transaction So my complaint around that was misleading and wrong. -- Thom -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers