David Osborne <david@qcode.co.uk> writes:
> Hi, yes I've run "analyse" against the newly restored database. Should that
> be enough?
My apologies, you did say that further down in the original message.
It looks like the core of the problem is the poor rowcount estimation
here:
-> Bitmap Index Scan on stock_trans_product_idx (cost=0.00..31.42 rows=1465 width=0) (actual
time=0.009..0.009rows=0 loops=1)
Index Cond: (product_id = 2466420)
Buffers: shared hit=3
You might be able to improve that by raising the statistics target
for stock_trans.product_id. I'm not sure why you weren't getting
bitten by the same issue in 9.1; but the cost estimates aren't
that far apart for the two plans, so maybe you were just lucky ...
regards, tom lane