BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'ARGENTINA' 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 POLISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1739816.55..1739818.37 rows=727 width=38) (actual time=11270.256..11270.257 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=1764063 read=277209 dirtied=69 written=347 -> HashAggregate (cost=1739769.27..1739782.00 rows=727 width=38) (actual time=11270.190..11270.191 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1764060 read=277209 dirtied=69 written=347 -> Hash Join (cost=39454.18..1739278.19 rows=24554 width=38) (actual time=1158.669..11228.869 rows=24557 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1764060 read=277209 dirtied=69 written=347 -> Nested Loop (cost=39452.62..1738816.24 rows=24554 width=16) (actual time=1158.616..11192.667 rows=24557 loops=1) Buffers: shared hit=1764056 read=277209 dirtied=69 written=347 -> Hash Join (cost=39452.32..1730893.59 rows=24554 width=16) (actual time=1158.595..10977.820 rows=24557 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1690238 read=277209 dirtied=69 written=347 -> Nested Loop (cost=421.64..1691156.98 rows=122770 width=20) (actual time=7.549..9740.532 rows=123883 loops=1) Buffers: shared hit=1580390 read=241120 dirtied=69 written=297 -> Nested Loop (cost=421.20..1492194.52 rows=406331 width=16) (actual time=7.360..4707.068 rows=406567 loops=1) Buffers: shared hit=274180 read=202348 dirtied=27 written=258 -> Bitmap Heap Scan on part (cost=416.49..28235.73 rows=13427 width=4) (actual time=7.245..189.355 rows=13512 loops=1) Recheck Cond: ((p_type)::text = 'LARGE POLISHED COPPER'::text) Heap Blocks: exact=11500 Buffers: shared hit=535 read=11050 written=15 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.13 rows=13427 width=0) (actual time=4.872..4.872 rows=13512 loops=1) Index Cond: ((p_type)::text = 'LARGE POLISHED COPPER'::text) Buffers: shared read=85 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.043..0.322 rows=30 loops=13512) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=408890 Buffers: shared hit=273645 read=191298 dirtied=27 written=243 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.027..0.027 rows=30 loops=13512) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=40461 read=15592 written=15 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=406567) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1306210 read=38772 dirtied=42 written=39 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1147.328..1147.328 rows=299436 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14624kB Buffers: shared hit=109848 read=36089 written=50 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.199..1050.616 rows=299436 loops=1) Buffers: shared hit=109848 read=36089 written=50 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.050..0.085 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..0.020 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.020..0.020 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=0.012..0.013 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=19.741..198.746 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145102 Buffers: shared hit=109846 read=36089 written=50 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.759..12.759 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=826 written=1 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.008 rows=1 loops=24557) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73818 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.020..0.020 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=0.004..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.058 ms Execution time: 11271.141 ms (70 rows) COMMIT; COMMIT