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 = 'PERU') or (n1.n_name = 'PERU' 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=2354989.93..2356883.18 rows=58254 width=64) (actual time=90965.616..90990.867 rows=4 loops=1) Buffers: shared hit=1092311 read=338587 written=2499 -> Sort (cost=2354989.93..2355135.56 rows=58254 width=64) (actual time=90955.959..90961.393 rows=58166 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: 9716kB Buffers: shared hit=1092311 read=338587 written=2499 -> Hash Join (cost=894542.11..2350379.10 rows=58254 width=64) (actual time=48960.206..90580.041 rows=58166 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1092303 read=338587 written=2499 -> Hash Join (cost=889863.11..2315699.19 rows=1456355 width=72) (actual time=48838.112..86994.205 rows=1455361 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1090121 read=338587 written=2499 -> Bitmap Heap Scan on lineitem (cost=385783.73..1728734.96 rows=18219015 width=20) (actual time=17115.942..33522.605 rows=18229496 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=805978 read=309913 written=2161 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381228.98 rows=18219015 width=0) (actual time=16321.038..16321.038 rows=18312401 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=6902 read=42913 written=2102 -> Hash (cost=489031.49..489031.49 rows=1203831 width=60) (actual time=31721.365..31721.365 rows=1196482 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107497kB Buffers: shared hit=284143 read=28674 written=338 -> Hash Join (cost=15638.06..489031.49 rows=1203831 width=60) (actual time=499.355..30195.790 rows=1196482 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=284143 read=28674 written=338 -> Seq Scan on orders (cost=0.00..404880.36 rows=15059936 width=8) (actual time=0.015..5602.192 rows=15000000 loops=1) Buffers: shared hit=226024 read=28257 written=247 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=499.230..499.230 rows=119794 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10763kB Buffers: shared hit=58119 read=417 written=91 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=20.164..425.998 rows=119794 loops=1) Buffers: shared hit=58119 read=417 written=91 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.204..0.306 rows=2 loops=1) Join Filter: (((n1.n_name = 'UNITED STATES'::bpchar) AND (n2.n_name = 'PERU'::bpchar)) OR ((n1.n_name = 'PERU'::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=0.010..0.024 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=19.093..197.670 rows=59897 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58116 read=417 written=91 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.024..13.024 rows=59897 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=332 written=74 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=120.403..120.403 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=0.015..75.226 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 91025.583 ms (53 rows) COMMIT; COMMIT