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 = 'SMALL POLISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1761431.47..1761433.30 rows=730 width=38) (actual time=10764.737..10764.738 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=1955055 read=302339 dirtied=531 written=421 -> HashAggregate (cost=1761383.98..1761396.76 rows=730 width=38) (actual time=10764.672..10764.672 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1955052 read=302339 dirtied=531 written=421 -> Hash Join (cost=39455.47..1760887.68 rows=24815 width=38) (actual time=792.335..10725.904 rows=23918 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1955052 read=302339 dirtied=531 written=421 -> Nested Loop (cost=39453.91..1760420.84 rows=24815 width=16) (actual time=792.271..10690.782 rows=23918 loops=1) Buffers: shared hit=1955048 read=302339 dirtied=531 written=421 -> Hash Join (cost=39453.61..1752405.56 rows=24841 width=16) (actual time=792.250..10501.910 rows=23918 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1883155 read=302338 dirtied=531 written=421 -> Nested Loop (cost=422.93..1712660.70 rows=124205 width=20) (actual time=8.482..9632.633 rows=119904 loops=1) Buffers: shared hit=1737218 read=302338 dirtied=531 written=421 -> Nested Loop (cost=422.49..1511945.96 rows=409921 width=16) (actual time=8.425..3589.961 rows=394086 loops=1) Buffers: shared hit=288028 read=173100 dirtied=413 written=205 -> Bitmap Heap Scan on part (cost=421.93..28461.82 rows=13613 width=4) (actual time=8.362..169.730 rows=13153 loops=1) Recheck Cond: ((p_type)::text = 'SMALL POLISHED COPPER'::text) Heap Blocks: exact=11252 Buffers: shared hit=606 read=10728 written=15 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..418.52 rows=13613 width=0) (actual time=6.079..6.079 rows=13153 loops=1) Index Cond: ((p_type)::text = 'SMALL POLISHED COPPER'::text) Buffers: shared read=82 written=1 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.67 rows=31 width=20) (actual time=0.026..0.250 rows=30 loops=13153) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=287422 read=162372 dirtied=413 written=190 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.015..0.015 rows=0 loops=394086) 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=1449190 read=129238 dirtied=118 written=216 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=777.216..777.216 rows=299436 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14624kB Buffers: shared hit=145937 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=18.346..684.779 rows=299436 loops=1) Buffers: shared hit=145937 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.046..0.079 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=0.009..0.018 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.017..0.017 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=0.010..0.012 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=16.783..126.252 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145102 Buffers: shared hit=145935 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=10.306..10.306 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=833 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=23918) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71893 read=1 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.027..0.027 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=0.005..0.010 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.155 ms Execution time: 10766.289 ms (68 rows) COMMIT; COMMIT