"Erdmann, Markus @ Bellevue" <[email protected]> writes:
> Were trying to debug a performance issue affecting our staging database, and
> weve narrowed it down to a difference in the query optimizer in 9.5.2.
> Upgrading to 9.5 is important for us because we need the ability to import
> foreign schemas.
I think the core of the problem is the large rowcount estimation error
here:
> -> Bitmap Index Scan on
> transactions_transaction_c69e55a4 (cost=0.00..18.02 rows=161 width=0)
> (actual time=20.153..20.153 rows=269021 loops=1)
> Index Cond: ((date_created >=
> '2010-01-01'::date) AND (date_created <= '2015-12-31'::date))
That's a pretty simple condition and it's hard to believe that 9.5 does it
much differently than 9.4 did. Perhaps you forgot to ANALYZE, or were
using a larger statistics target in the 9.4 installation?
regards, tom lane
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