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 STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2238504.47..2238506.31 rows=733 width=38) (actual time=23122.405..23122.405 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=819373 read=177166 dirtied=615 written=20194 -> HashAggregate (cost=2238456.76..2238469.59 rows=733 width=38) (actual time=23122.342..23122.344 rows=2 loops=1) Buffers: shared hit=819370 read=177166 dirtied=615 written=20194 -> Nested Loop (cost=495782.92..2237946.68 rows=25504 width=38) (actual time=17251.502..23077.404 rows=24185 loops=1) Buffers: shared hit=819370 read=177166 dirtied=615 written=20194 -> Nested Loop (cost=495782.92..2230672.94 rows=25504 width=16) (actual time=17251.447..22981.602 rows=24185 loops=1) Buffers: shared hit=771000 read=177166 dirtied=615 written=20194 -> Hash Join (cost=495782.92..2223237.64 rows=25533 width=16) (actual time=17251.404..22760.102 rows=24185 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=698383 read=177094 dirtied=615 written=20189 -> Nested Loop (cost=0.00..1725102.75 rows=419330 width=16) (actual time=0.302..4384.838 rows=396557 loops=1) Buffers: shared hit=306067 read=157491 dirtied=615 written=20189 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..48224.15 rows=13967 width=4) (actual time=0.214..177.023 rows=13206 loops=1) Index Cond: (p_type = 'ECONOMY POLISHED STEEL'::text) Heap Fetches: 13206 Buffers: shared hit=2198 read=9208 written=911 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..119.75 rows=31 width=20) (actual time=0.031..0.308 rows=30 loops=13206) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=303869 read=148283 dirtied=615 written=19278 -> Hash (cost=484354.83..484354.83 rows=914247 width=8) (actual time=17249.262..17249.262 rows=910325 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35560kB Buffers: shared hit=392313 read=19603 -> Hash Join (cost=135979.69..484354.83 rows=914247 width=8) (actual time=3362.558..16483.750 rows=910325 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=392313 read=19603 -> Bitmap Heap Scan on orders (cost=96949.06..419039.60 rows=4571236 width=12) (actual time=2135.835..4916.770 rows=4557440 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=254908 read=11070 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95806.26 rows=4571236 width=0) (actual time=2055.134..2055.134 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1387 read=11069 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1226.225..1226.225 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=137405 read=8533 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=33.395..1082.978 rows=299436 loops=1) Buffers: shared hit=137405 read=8533 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.033..0.089 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..0.018 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: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.011 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=26.273..201.399 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=137403 read=8533 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.673..17.673 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=358 read=476 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.008..0.008 rows=1 loops=24185) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72617 read=72 written=5 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.002..0.002 rows=1 loops=24185) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48370 Total runtime: 23134.488 ms (64 rows) COMMIT; COMMIT