On 1 September 2010 10:23, Edwin Grubbs <[email protected]> wrote: > On Tue, Aug 10, 2010 at 9:54 PM, Robert Collins > <[email protected]> wrote: >> On Tue, Aug 10, 2010 at 11:40 PM, Tom Haddon <[email protected]> >> wrote: >>> On Tue, 2010-08-10 at 21:04 +1200, Robert Collins wrote: >>> [...] >>>> I helped wgrant out with some explain analyzes - it seems to me it >>>> might be nice - handwaving - to permit explain-analyze calls by any >>>> developer, but perhaps thats just insanity at this hour of the night >>>> kicking in:) >>> >>> We'd really like to push fairly hard against this one. EXPLAIN ANALYZE >>> actually runs the query against the DB, so it has the potential to cause >>> performance problems if it's a badly constructed query, apart from >>> anything else. >> >> Hell yeah. I was thinking *staging* only. Yes there can be performance >> issues, but thats rather the point :) >> >> -Rob > > Please, please please do something like this. I waste so much time > trying to optimize queries. A lot of the time is spent just trying to > think of every possible piece of information I need up front, so that > I don't have to harass the losas over and over again. We've talked > about providing a test database before but I don't know what happened > to that. One caveat of just allowing explain analyze queries is that > you can't test whether adding an index will change the complex query > plan.
Is there any way to get postgres to record the query plan and/or cost at the same time as executing the statement, rather than making you do a separate expensive query just to analyze it? I see there are options to log the query plan <http://www.postgresql.org/docs/8.1/static/runtime-config-logging.html>, and they could possibly be turned on just for a single request (eg by a url decorator) but I don't know if they actually give you enough data to be useful. -- Martin _______________________________________________ Mailing list: https://launchpad.net/~launchpad-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~launchpad-dev More help : https://help.launchpad.net/ListHelp
