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 = 'UNITED STATES' and n2.n_name = 'FRANCE') or (n1.n_name = 'FRANCE' and n2.n_name = 'UNITED STATES') ) 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=2356991.11..2358890.09 rows=58430 width=64) (actual time=83533.434..83565.752 rows=4 loops=1) Buffers: shared hit=900384 read=529289 written=6759 -> Sort (cost=2356991.11..2357137.19 rows=58430 width=64) (actual time=83522.491..83532.939 rows=57804 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: 9665kB Buffers: shared hit=900384 read=529289 written=6759 -> Hash Join (cost=895921.59..2352365.09 rows=58430 width=64) (actual time=42275.320..83171.681 rows=57804 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=900376 read=529289 written=6759 -> Hash Join (cost=891242.59..2317556.90 rows=1462637 width=72) (actual time=42151.301..79600.789 rows=1465209 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=898194 read=529289 written=6759 -> Bitmap Heap Scan on lineitem (cost=387649.20..1730721.15 rows=18297597 width=20) (actual time=13607.305..30837.209 rows=18248203 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=628853 read=485985 written=6759 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383074.80 rows=18297597 width=0) (actual time=12971.327..12971.327 rows=18284460 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=3 read=49812 written=3 -> Hash (cost=488560.48..488560.48 rows=1202633 width=60) (actual time=28542.974..28542.974 rows=1207197 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108460kB Buffers: shared hit=269341 read=43304 -> Hash Join (cost=15638.06..488560.48 rows=1202633 width=60) (actual time=780.686..27787.321 rows=1207197 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=269341 read=43304 -> Seq Scan on orders (cost=0.00..404477.52 rows=15044952 width=8) (actual time=0.013..4890.643 rows=15015000 loops=1) Buffers: shared hit=229194 read=24834 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=780.509..780.509 rows=120322 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10811kB Buffers: shared hit=40147 read=18470 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=25.747..695.033 rows=120322 loops=1) Buffers: shared hit=40147 read=18470 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.143..0.345 rows=2 loops=1) Join Filter: (((n1.n_name = 'UNITED STATES'::bpchar) AND (n2.n_name = 'FRANCE'::bpchar)) OR ((n1.n_name = 'FRANCE'::bpchar) AND (n2.n_name = 'UNITED STATES'::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=0.016..0.029 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=0.004..0.008 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=23.765..327.185 rows=60161 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=40144 read=18470 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=16.537..16.537 rows=60161 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=335 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=123.422..123.422 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=0.009..78.725 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 83609.851 ms (53 rows) COMMIT; COMMIT