Hi,
I'm running a rails app, where I have a model called Car that has_many Images.
Now when I tell rails to include those images, when querying say 50 cars, then
it often decides to use a SELECT * from images WHERE car_id IN
(id1,id2,id3,id4…) instead of doing a join.
Now either way it uses the index I have on car_id:
Index Scan using car_id_ix on adverts (cost=0.47..5665.34 rows=1224 width=234)
Index Cond: (car_id = ANY
('{7097561,7253541,5159633,6674471,...}'::integer[]))
But it's slow, it's very slow. In this case it took 3,323ms
Can I do anything to optimize that query or maybe the index or something?
The table has 16.000.000 rows
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