BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'JORDAN' 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 = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'PROMO BRUSHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1687360.54..1687362.37 rows=733 width=38) (actual time=9004.366..9004.367 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=1794367 read=229225 dirtied=1725 written=7956 -> HashAggregate (cost=1687312.83..1687325.66 rows=733 width=38) (actual time=9004.307..9004.308 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1794364 read=229225 dirtied=1725 written=7956 -> Hash Join (cost=39434.15..1686838.05 rows=23739 width=38) (actual time=1068.879..8968.032 rows=24339 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1794364 read=229225 dirtied=1725 written=7956 -> Nested Loop (cost=39432.59..1686391.38 rows=23739 width=16) (actual time=1068.819..8935.624 rows=24339 loops=1) Buffers: shared hit=1794360 read=229225 dirtied=1725 written=7956 -> Hash Join (cost=39432.30..1678731.69 rows=23739 width=16) (actual time=1068.804..8757.633 rows=24339 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1721189 read=229225 dirtied=1725 written=7956 -> Nested Loop (cost=401.61..1639018.51 rows=118693 width=20) (actual time=7.570..7601.996 rows=122462 loops=1) Buffers: shared hit=1611138 read=193121 dirtied=1725 written=7956 -> Nested Loop (cost=401.18..1448034.90 rows=390043 width=16) (actual time=7.506..3785.117 rows=402645 loops=1) Buffers: shared hit=295932 read=176487 dirtied=1725 written=6825 -> Bitmap Heap Scan on part (cost=400.61..27614.16 rows=12927 width=4) (actual time=7.434..164.959 rows=13430 loops=1) Recheck Cond: ((p_type)::text = 'PROMO BRUSHED NICKEL'::text) Heap Blocks: exact=11462 Buffers: shared hit=1463 read=10083 written=282 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..397.38 rows=12927 width=0) (actual time=5.066..5.066 rows=13430 loops=1) Index Cond: ((p_type)::text = 'PROMO BRUSHED NICKEL'::text) Buffers: shared read=84 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.57 rows=31 width=20) (actual time=0.025..0.260 rows=30 loops=13430) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=294469 read=166404 dirtied=1725 written=6543 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.009..0.009 rows=0 loops=402645) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1315206 read=16634 written=1131 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1056.656..1056.656 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=110051 read=36104 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=19.304..947.064 rows=299838 loops=1) Buffers: shared hit=110051 read=36104 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.052..0.091 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=0.007..0.017 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 = 'MIDDLE EAST'::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=16.763..178.873 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=110049 read=36104 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=10.881..10.881 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=24339) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73171 -> 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=0.002..0.005 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.414 ms Execution time: 9005.444 ms (66 rows) COMMIT; COMMIT