Rolf Østvik skrev:
I have a simple query which uses 32ms on 7.4.14 and 1015ms on 8.2.0.
I guess 7.4.14 creates a better execution plan than 8.2.0 for this query but
Try to turn off planner options in 8.2 to make it generate the same plan
as 7.4. Then run EXPLAIN ANALYZE on that query that generate the same
plan as in 7.4 and we can compare the costs and maybe understand what go
wrong.
For example, try
set enable_hashjoin to false;
set enable_bitmapscan to false;
but you might need to turn off more things to get it to generate the 7.4
plan.
/Dennis
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TIP 6: explain analyze is your friend
