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 = 'ECONOMY ANODIZED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1757651.78..1757653.61 rows=732 width=38) (actual time=13299.464..13299.465 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=1814153 read=247405 dirtied=115 written=5082 -> HashAggregate (cost=1757604.14..1757616.95 rows=732 width=38) (actual time=13299.357..13299.358 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1814150 read=247405 dirtied=115 written=5082 -> Hash Join (cost=39459.31..1757105.92 rows=24911 width=38) (actual time=1146.988..13247.303 rows=24929 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1814150 read=247405 dirtied=115 written=5082 -> Nested Loop (cost=39457.75..1756637.28 rows=24911 width=16) (actual time=1146.909..13194.100 rows=24929 loops=1) Buffers: shared hit=1814146 read=247405 dirtied=115 written=5082 -> Hash Join (cost=39457.46..1748599.43 rows=24911 width=16) (actual time=1146.888..12936.510 rows=24929 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1739238 read=247405 dirtied=115 written=5082 -> Nested Loop (cost=426.77..1708852.55 rows=124555 width=20) (actual time=12.201..11655.793 rows=124671 loops=1) Buffers: shared hit=1594152 read=246554 dirtied=115 written=5046 -> Nested Loop (cost=426.33..1508272.56 rows=409646 width=16) (actual time=11.526..5771.931 rows=410889 loops=1) Buffers: shared hit=273341 read=208608 dirtied=115 written=4336 -> Bitmap Heap Scan on part (cost=421.62..28413.37 rows=13573 width=4) (actual time=11.341..181.992 rows=13678 loops=1) Recheck Cond: ((p_type)::text = 'ECONOMY ANODIZED COPPER'::text) Heap Blocks: exact=11655 Buffers: shared hit=4366 read=7375 written=138 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..418.23 rows=13573 width=0) (actual time=8.196..8.196 rows=13678 loops=1) Index Cond: ((p_type)::text = 'ECONOMY ANODIZED COPPER'::text) Buffers: shared read=86 written=2 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.049..0.394 rows=30 loops=13678) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=413366 Buffers: shared hit=268975 read=201233 dirtied=115 written=4198 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.031..0.031 rows=30 loops=13678) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=41242 read=15600 written=279 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.013..0.013 rows=0 loops=410889) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1320811 read=37946 written=710 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1130.936..1130.936 rows=299436 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14624kB Buffers: shared hit=145086 read=851 written=36 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=35.910..995.335 rows=299436 loops=1) Buffers: shared hit=145086 read=851 written=36 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.072..0.104 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=0.010..0.019 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.029..0.029 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.020..0.021 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=28.578..181.826 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145102 Buffers: shared hit=145084 read=851 written=36 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=19.198..19.198 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=8 read=825 written=35 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.009 rows=1 loops=24929) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74908 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.032..0.032 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.005..0.009 rows=25 loops=1) Buffers: shared hit=1 Planning time: 12.148 ms Execution time: 13300.791 ms (70 rows) COMMIT; COMMIT