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 = 'PROMO BRUSHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2122158.16..2122159.98 rows=728 width=38) (actual time=40486.576..40486.577 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=723640 read=280438 dirtied=2359 written=44 -> HashAggregate (cost=2122110.81..2122123.55 rows=728 width=38) (actual time=40486.493..40486.495 rows=2 loops=1) Buffers: shared hit=723637 read=280438 dirtied=2359 written=44 -> Nested Loop (cost=500669.40..2121641.31 rows=23475 width=38) (actual time=25442.626..40390.259 rows=24087 loops=1) Buffers: shared hit=723637 read=280438 dirtied=2359 written=44 -> Nested Loop (cost=500669.40..2114946.24 rows=23475 width=16) (actual time=25442.563..40105.914 rows=24087 loops=1) Buffers: shared hit=675463 read=280438 dirtied=2359 written=44 -> Hash Join (cost=500669.40..2108108.24 rows=23482 width=16) (actual time=25442.533..39367.684 rows=24087 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=603065 read=280438 dirtied=2359 written=44 -> Nested Loop (cost=0.00..1605261.23 rows=388557 width=16) (actual time=0.561..12541.606 rows=398662 loops=1) Buffers: shared hit=241746 read=226867 dirtied=2359 written=42 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..44820.70 rows=12827 width=4) (actual time=0.407..384.310 rows=13257 loops=1) Index Cond: (p_type = 'PROMO BRUSHED BRASS'::text) Heap Fetches: 13257 Buffers: shared hit=3630 read=7773 written=2 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..121.34 rows=31 width=20) (actual time=0.092..0.898 rows=30 loops=13257) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=238116 read=219094 dirtied=2359 written=40 -> Hash (cost=489224.63..489224.63 rows=915581 width=8) (actual time=25440.460..25440.460 rows=911249 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35596kB Buffers: shared hit=361316 read=53571 written=2 -> Hash Join (cost=138432.12..489224.63 rows=915581 width=8) (actual time=5904.764..24725.838 rows=911249 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=361316 read=53571 written=2 -> Bitmap Heap Scan on orders (cost=99401.50..423871.06 rows=4577904 width=12) (actual time=3404.832..9442.343 rows=4561673 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=251479 read=17470 written=2 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98257.03 rows=4577904 width=0) (actual time=3255.934..3255.934 rows=4602796 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13148 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2499.722..2499.722 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=109837 read=36101 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=45.324..2281.682 rows=299436 loops=1) Buffers: shared hit=109837 read=36101 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.030..0.098 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=0.006..0.020 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.016..0.016 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=0.013..0.014 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=36.023..435.631 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=109835 read=36101 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=25.648..25.648 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=0.027..0.028 rows=1 loops=24087) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72398 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.007..0.008 rows=1 loops=24087) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48174 Total runtime: 40505.052 ms (64 rows) COMMIT; COMMIT