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 = 'ECONOMY POLISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1743186.33..1743188.15 rows=729 width=38) (actual time=14742.622..14742.623 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=1990644 read=318089 dirtied=66 written=9178 -> HashAggregate (cost=1743138.91..1743151.67 rows=729 width=38) (actual time=14742.587..14742.589 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1990641 read=318089 dirtied=66 written=9178 -> Hash Join (cost=38753.98..1742649.39 rows=24476 width=38) (actual time=2577.702..14699.820 rows=23878 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1990641 read=318089 dirtied=66 written=9178 -> Nested Loop (cost=38752.42..1742188.90 rows=24476 width=16) (actual time=2577.653..14658.677 rows=23878 loops=1) Buffers: shared hit=1990637 read=318089 dirtied=66 written=9178 -> Hash Join (cost=38752.13..1734278.48 rows=24516 width=16) (actual time=2577.640..14512.204 rows=23878 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1918963 read=317974 dirtied=66 written=9178 -> Nested Loop (cost=421.98..1695243.50 rows=122579 width=20) (actual time=7.564..11859.653 rows=120687 loops=1) Buffers: shared hit=1748252 read=312287 dirtied=66 written=9178 -> Nested Loop (cost=421.55..1497084.68 rows=404708 width=16) (actual time=6.997..6616.209 rows=398391 loops=1) Buffers: shared hit=237345 read=227399 dirtied=66 written=8505 -> Bitmap Heap Scan on part (cost=416.90..28299.15 rows=13480 width=4) (actual time=6.896..152.656 rows=13281 loops=1) Recheck Cond: ((p_type)::text = 'ECONOMY POLISHED COPPER'::text) Heap Blocks: exact=11402 Buffers: shared hit=4596 read=6889 written=342 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.53 rows=13480 width=0) (actual time=4.564..4.564 rows=13281 loops=1) Index Cond: ((p_type)::text = 'ECONOMY POLISHED COPPER'::text) Buffers: shared read=83 -> Bitmap Heap Scan on lineitem (cost=4.65..108.65 rows=31 width=20) (actual time=0.034..0.470 rows=30 loops=13281) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=398995 Buffers: shared hit=232749 read=220510 dirtied=66 written=8163 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_idx (cost=0.00..4.64 rows=31 width=0) (actual time=0.025..0.025 rows=30 loops=13281) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=43157 read=11107 written=414 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=398391) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1510907 read=84888 written=673 -> Hash (cost=34580.15..34580.15 rows=300000 width=4) (actual time=2565.741..2565.741 rows=299436 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14624kB Buffers: shared hit=170711 read=5687 -> Nested Loop (cost=766.08..34580.15 rows=300000 width=4) (actual time=3.745..2465.949 rows=299436 loops=1) Buffers: shared hit=170711 read=5687 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.031..0.057 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=0.003..0.011 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: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.008..0.009 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=765.00..6315.54 rows=60000 width=8) (actual time=3.643..483.430 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Rows Removed by Index Recheck: 1440113 Heap Blocks: lossy=176390 Buffers: shared hit=170709 read=5687 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=3.611..3.611 rows=353280 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=4 read=2 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=23878) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71674 read=115 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.021..0.021 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..0.009 rows=25 loops=1) Buffers: shared hit=1 Planning time: 5.624 ms Execution time: 14743.266 ms (73 rows) COMMIT; COMMIT