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 = 'SMALL BURNISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2173104.18..2173106.00 rows=730 width=38) (actual time=26413.854..26413.855 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=887651 read=106844 dirtied=622 written=5280 -> HashAggregate (cost=2173056.69..2173069.46 rows=730 width=38) (actual time=26413.782..26413.783 rows=2 loops=1) Buffers: shared hit=887648 read=106844 dirtied=622 written=5280 -> Nested Loop (cost=494909.45..2172570.61 rows=24304 width=38) (actual time=20793.190..26359.163 rows=24124 loops=1) Buffers: shared hit=887648 read=106844 dirtied=622 written=5280 -> Nested Loop (cost=494909.45..2165639.10 rows=24304 width=16) (actual time=20793.125..26210.463 rows=24124 loops=1) Buffers: shared hit=839400 read=106844 dirtied=622 written=5280 -> Hash Join (cost=494909.45..2158553.83 rows=24331 width=16) (actual time=20793.089..25925.840 rows=24124 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=768022 read=105694 dirtied=622 written=5275 -> Nested Loop (cost=0.00..1661394.51 rows=401312 width=16) (actual time=0.309..3903.822 rows=395114 loops=1) Buffers: shared hit=374313 read=87484 dirtied=622 written=5275 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46442.41 rows=13367 width=4) (actual time=0.242..200.453 rows=13149 loops=1) Index Cond: (p_type = 'SMALL BURNISHED COPPER'::text) Heap Fetches: 13149 Buffers: shared hit=2004 read=9248 written=614 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.51 rows=31 width=20) (actual time=0.035..0.266 rows=30 loops=13149) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=372309 read=78236 dirtied=622 written=4661 -> Hash (cost=483530.43..483530.43 rows=910322 width=8) (actual time=20791.679..20791.679 rows=910325 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35560kB Buffers: shared hit=393706 read=18210 -> Hash Join (cost=135562.52..483530.43 rows=910322 width=8) (actual time=5003.631..20012.895 rows=910325 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=393706 read=18210 -> Bitmap Heap Scan on orders (cost=96531.90..418328.05 rows=4551610 width=12) (actual time=2360.541..5657.142 rows=4557440 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=260226 read=5752 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95394.00 rows=4551610 width=0) (actual time=2173.881..2173.881 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=6705 read=5751 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2642.390..2642.390 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=133480 read=12458 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=37.914..1412.655 rows=299436 loops=1) Buffers: shared hit=133480 read=12458 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.026..0.083 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=0.004..0.014 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.012..0.012 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=0.009..0.010 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=27.277..265.056 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=133478 read=12458 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.623..17.623 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=654 read=180 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.010..0.010 rows=1 loops=24124) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71378 read=1150 written=5 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.004 rows=1 loops=24124) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48248 Total runtime: 26433.189 ms (64 rows) COMMIT; COMMIT