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 = 'PROMO POLISHED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1738119.60..1738121.42 rows=729 width=38) (actual time=11577.839..11577.840 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=1760744 read=255415 dirtied=153 written=97 -> HashAggregate (cost=1738072.18..1738084.93 rows=729 width=38) (actual time=11577.766..11577.767 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1760741 read=255415 dirtied=153 written=97 -> Hash Join (cost=39454.13..1737582.26 rows=24496 width=38) (actual time=1101.093..11534.759 rows=24352 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1760741 read=255415 dirtied=153 written=97 -> Nested Loop (cost=39452.56..1737121.39 rows=24496 width=16) (actual time=1101.028..11493.724 rows=24352 loops=1) Buffers: shared hit=1760737 read=255415 dirtied=153 written=97 -> Hash Join (cost=39452.27..1729217.44 rows=24496 width=16) (actual time=1101.006..11267.415 rows=24352 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1687537 read=255415 dirtied=153 written=97 -> Nested Loop (cost=421.58..1689482.50 rows=122478 width=20) (actual time=7.884..10044.262 rows=121529 loops=1) Buffers: shared hit=1577700 read=219315 dirtied=153 written=97 -> Nested Loop (cost=421.15..1491412.36 rows=404518 width=16) (actual time=7.622..5006.559 rows=401394 loops=1) Buffers: shared hit=276717 read=193198 dirtied=153 written=83 -> Bitmap Heap Scan on part (cost=416.43..28227.58 rows=13420 width=4) (actual time=7.499..184.911 rows=13376 loops=1) Recheck Cond: ((p_type)::text = 'PROMO POLISHED STEEL'::text) Heap Blocks: exact=11470 Buffers: shared hit=1820 read=9734 written=7 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.08 rows=13420 width=0) (actual time=5.117..5.117 rows=13376 loops=1) Index Cond: ((p_type)::text = 'PROMO POLISHED STEEL'::text) Buffers: shared read=84 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.044..0.349 rows=30 loops=13376) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=402735 Buffers: shared hit=274897 read=183464 dirtied=153 written=76 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.029..0.029 rows=30 loops=13376) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=39904 read=15722 written=5 -> 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=401394) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1300983 read=26117 written=14 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1090.252..1090.252 rows=299436 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14624kB Buffers: shared hit=109837 read=36100 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=22.138..995.343 rows=299436 loops=1) Buffers: shared hit=109837 read=36100 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.048..0.077 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=0.005..0.012 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.021..0.021 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=0.015..0.016 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=18.955..187.675 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145102 Buffers: shared hit=109835 read=36100 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.209..12.209 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=826 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.008 rows=1 loops=24352) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73200 -> 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..0.006 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.313 ms Execution time: 11579.643 ms (70 rows) COMMIT; COMMIT