BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select supp_nation, cust_nation, l_year, sum(volume) as revenue from ( select n1.n_name as supp_nation, n2.n_name as cust_nation, extract(year from l_shipdate) as l_year, l_extendedprice * (1 - l_discount) as volume from supplier, lineitem, orders, customer, nation n1, nation n2 where s_suppkey = l_suppkey and o_orderkey = l_orderkey and c_custkey = o_custkey and s_nationkey = n1.n_nationkey and c_nationkey = n2.n_nationkey and ( (n1.n_name = 'FRANCE' and n2.n_name = 'GERMANY') or (n1.n_name = 'GERMANY' and n2.n_name = 'FRANCE') ) and l_shipdate between date '1995-01-01' and date '1996-12-31' ) as shipping group by supp_nation, cust_nation, l_year order by supp_nation, cust_nation, l_year; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- GroupAggregate (cost=2347255.78..2349139.77 rows=57969 width=64) (actual time=39578.649..39600.669 rows=4 loops=1) Buffers: shared hit=337930 read=1088980 -> Sort (cost=2347255.78..2347400.70 rows=57969 width=64) (actual time=39571.303..39574.837 rows=58428 loops=1) Sort Key: n1.n_name, n2.n_name, (date_part('year'::text, (lineitem.l_shipdate)::timestamp without time zone)) Sort Method: quicksort Memory: 9753kB Buffers: shared hit=337930 read=1088980 -> Hash Join (cost=891852.03..2342669.56 rows=57969 width=64) (actual time=14944.597..39346.368 rows=58428 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=337922 read=1088980 -> Hash Join (cost=887173.03..2308131.83 rows=1449460 width=72) (actual time=14880.478..37640.417 rows=1465299 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=335740 read=1088980 -> Bitmap Heap Scan on lineitem (cost=384551.59..1723017.94 rows=18132757 width=20) (actual time=6036.215..18895.278 rows=18248249 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=24082 read=1088629 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..380018.40 rows=18132757 width=0) (actual time=5656.992..5656.992 rows=18248249 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=487618.47..487618.47 rows=1200238 width=60) (actual time=8843.383..8843.383 rows=1207112 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108452kB Buffers: shared hit=311658 read=351 -> Hash Join (cost=15638.06..487618.47 rows=1200238 width=60) (actual time=308.340..8398.017 rows=1207112 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=311658 read=351 -> Seq Scan on orders (cost=0.00..403671.84 rows=15014984 width=8) (actual time=0.016..2646.131 rows=15015000 loops=1) Buffers: shared hit=253505 read=17 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=308.201..308.201 rows=120469 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10824kB Buffers: shared hit=58153 read=334 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=17.172..270.785 rows=120469 loops=1) Buffers: shared hit=58153 read=334 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.133..0.330 rows=2 loops=1) Join Filter: (((n1.n_name = 'FRANCE'::bpchar) AND (n2.n_name = 'GERMANY'::bpchar)) OR ((n1.n_name = 'GERMANY'::bpchar) AND (n2.n_name = 'FRANCE'::bpchar))) Rows Removed by Join Filter: 623 Buffers: shared hit=3 -> Index Scan using pk_nation on nation n1 (cost=0.00..12.63 rows=25 width=30) (actual time=0.019..0.042 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.003 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.008..0.013 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=16.622..124.662 rows=60234 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58150 read=334 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=11.003..11.003 rows=60234 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=4 read=332 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=63.913..63.913 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2179 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.013..37.469 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 39621.725 ms (53 rows) COMMIT; COMMIT