Hmm, weird -- now the RI_Initial_Check() query is much quicker (20s). We do ANALYZE the data every few nights, so maybe that's what changed it. I'll keep that in mind. -Ben
On Fri, Nov 1, 2013 at 3:19 AM, Tom Lane <tgl@xxxxxxxxxxxxx> wrote:
Ben Hoyt <benhoyt@xxxxxxxxx> writes:
>> It appears the possible explanations for Ben's problem are:
>> 1. For some reason this query is a lot slower than the one he came up
>> with;
> Anyway, it's definitely #1 that's happening, as I build theHuh. Maybe an optimizer failing? Could we see the full text of both
> RI_Initial_Check() query by hand, and it takes just as long as the ADD
> CONSTRAINT.
queries and EXPLAIN ANALYZE results for them?
Doesn't seem unreasonable. One thought is that maybe you need to insert a
> So I guess this is really a side effect of the quirky way we're
> dumping and restoring only one schema, and dropping/re-adding
> constraints on deployment because of this. Is this a really strange
> thing to do -- deploying only one schema (the "static" data) and
> dropping/re-adding constraints -- or are there better practices here?
manual ANALYZE after reloading the data?
regards, tom lane
