BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'BRAZIL' 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 = 'LARGE BURNISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2224508.60..2224510.43 rows=731 width=38) (actual time=31735.026..31735.027 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=782382 read=228631 dirtied=3638 written=28 -> HashAggregate (cost=2224461.03..2224473.83 rows=731 width=38) (actual time=31734.933..31734.934 rows=2 loops=1) Buffers: shared hit=782379 read=228631 dirtied=3638 written=28 -> Nested Loop (cost=504002.23..2223953.37 rows=25383 width=38) (actual time=22632.023..31657.005 rows=24325 loops=1) Buffers: shared hit=782379 read=228631 dirtied=3638 written=28 -> Nested Loop (cost=504002.23..2216714.14 rows=25383 width=16) (actual time=22631.950..31435.694 rows=24325 loops=1) Buffers: shared hit=733729 read=228631 dirtied=3638 written=28 -> Hash Join (cost=504002.23..2209322.58 rows=25383 width=16) (actual time=22631.896..31030.992 rows=24325 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=660633 read=228631 dirtied=3638 written=28 -> Nested Loop (cost=0.00..1702977.11 rows=417882 width=16) (actual time=0.530..7025.397 rows=401150 loops=1) Buffers: shared hit=263940 read=209101 dirtied=3638 written=4 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47516.20 rows=13727 width=4) (actual time=0.416..260.168 rows=13317 loops=1) Index Cond: (p_type = 'LARGE BURNISHED COPPER'::text) Heap Fetches: 13317 Buffers: shared hit=2052 read=9425 written=1 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.29 rows=31 width=20) (actual time=0.050..0.492 rows=30 loops=13317) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=261888 read=199676 dirtied=3638 written=3 -> Hash (cost=492442.56..492442.56 rows=924774 width=8) (actual time=22629.826..22629.826 rows=911232 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35595kB Buffers: shared hit=396690 read=19530 written=24 -> Hash Join (cost=139431.27..492442.56 rows=924774 width=8) (actual time=5167.897..21344.652 rows=911232 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=396690 read=19530 written=24 -> Bitmap Heap Scan on orders (cost=100400.65..426824.69 rows=4623869 width=12) (actual time=3536.601..8293.377 rows=4561762 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=251580 read=18702 written=24 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..99244.69 rows=4623869 width=0) (actual time=3317.817..3317.817 rows=4625776 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=663 read=12553 written=7 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1630.982..1630.982 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=145110 read=828 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=35.290..1439.300 rows=299436 loops=1) Buffers: shared hit=145110 read=828 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.229..0.297 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=0.011..0.023 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.204..0.204 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=0.200..0.201 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=36.556..267.895 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145108 read=828 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=25.097..25.097 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=827 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.014..0.014 rows=1 loops=24325) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73096 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.006..0.006 rows=1 loops=24325) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48650 Total runtime: 31749.780 ms (64 rows) COMMIT; COMMIT