BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'UNITED STATES' then volume else 0 end) / sum(volume) as mkt_share from ( select extract(year from o_orderdate) as o_year, l_extendedprice * (1 - l_discount) as volume, n2.n_name as nation from part, supplier, lineitem, orders, customer, nation n1, nation n2, region where p_partkey = l_partkey and s_suppkey = l_suppkey and l_orderkey = o_orderkey and o_custkey = c_custkey and c_nationkey = n1.n_nationkey and n1.n_regionkey = r_regionkey and r_name = 'AMERICA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'PROMO PLATED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2197452.45..2197454.28 rows=733 width=38) (actual time=44047.471..44047.472 rows=2 loops=1) Sort Key: (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone)) Sort Method: quicksort Memory: 25kB Buffers: shared hit=715343 read=290656 dirtied=625 written=1 -> HashAggregate (cost=2197404.74..2197417.57 rows=733 width=38) (actual time=44047.384..44047.386 rows=2 loops=1) Buffers: shared hit=715340 read=290656 dirtied=625 written=1 -> Nested Loop (cost=496876.58..2196907.52 rows=24861 width=38) (actual time=30529.032..43963.812 rows=24256 loops=1) Buffers: shared hit=715340 read=290656 dirtied=625 written=1 -> Nested Loop (cost=496876.58..2189817.16 rows=24861 width=16) (actual time=30528.943..43539.182 rows=24256 loops=1) Buffers: shared hit=666828 read=290656 dirtied=625 written=1 -> Hash Join (cost=496876.58..2182577.57 rows=24861 width=16) (actual time=30528.890..42881.449 rows=24256 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=593896 read=290656 dirtied=625 written=1 -> Nested Loop (cost=0.00..1683409.70 rows=408537 width=16) (actual time=0.545..10881.824 rows=403330 loops=1) Buffers: shared hit=260094 read=211779 dirtied=373 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47041.45 rows=13567 width=4) (actual time=0.441..293.001 rows=13449 loops=1) Index Cond: (p_type = 'PROMO PLATED TIN'::text) Heap Fetches: 13449 Buffers: shared hit=4869 read=6692 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.30 rows=31 width=20) (actual time=0.082..0.770 rows=30 loops=13449) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=255225 read=205087 dirtied=373 -> Hash (cost=485421.13..485421.13 rows=916436 width=8) (actual time=30525.311..30525.311 rows=911184 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35594kB Buffers: shared hit=333799 read=78877 dirtied=252 written=1 -> Hash Join (cost=136059.87..485421.13 rows=916436 width=8) (actual time=5534.915..29732.982 rows=911184 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=333799 read=78877 dirtied=252 written=1 -> Bitmap Heap Scan on orders (cost=97029.25..420042.97 rows=4582181 width=12) (actual time=3678.163..12658.153 rows=4561773 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=190679 read=76059 dirtied=252 written=1 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95883.71 rows=4582181 width=0) (actual time=3520.826..3520.826 rows=4575464 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=2 read=12455 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1856.087..1856.087 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=143120 read=2818 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=36.605..1641.832 rows=299436 loops=1) Buffers: shared hit=143120 read=2818 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.069..0.135 rows=5 loops=1) Hash Cond: (n1.n_regionkey = region.r_regionkey) Buffers: shared hit=2 -> Seq Scan on nation n1 (cost=0.00..1.25 rows=25 width=8) (actual time=0.026..0.042 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.025..0.025 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.022..0.023 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=36.106..306.946 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=143118 read=2818 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=25.127..25.127 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=13 read=821 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.024..0.025 rows=1 loops=24256) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72932 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.013..0.014 rows=1 loops=24256) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48512 Total runtime: 44076.367 ms (64 rows) COMMIT; COMMIT