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 = 'SMALL ANODIZED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2135641.84..2135643.67 rows=733 width=38) (actual time=23382.315..23382.315 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=827155 read=171308 dirtied=647 written=20669 -> HashAggregate (cost=2135594.13..2135606.96 rows=733 width=38) (actual time=23382.238..23382.239 rows=2 loops=1) Buffers: shared hit=827152 read=171308 dirtied=647 written=20669 -> Nested Loop (cost=495782.92..2135118.89 rows=23762 width=38) (actual time=17152.982..23333.469 rows=24296 loops=1) Buffers: shared hit=827152 read=171308 dirtied=647 written=20669 -> Nested Loop (cost=495782.92..2128341.97 rows=23762 width=16) (actual time=17152.923..23228.291 rows=24296 loops=1) Buffers: shared hit=778560 read=171308 dirtied=647 written=20669 -> Hash Join (cost=495782.92..2121414.53 rows=23789 width=16) (actual time=17152.857..22989.636 rows=24296 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=705819 read=171031 dirtied=647 written=20663 -> Nested Loop (cost=0.00..1623440.28 rows=390689 width=16) (actual time=0.452..4683.814 rows=397671 loops=1) Buffers: shared hit=304739 read=160192 dirtied=647 written=20663 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45379.52 rows=13013 width=4) (actual time=0.328..204.133 rows=13245 loops=1) Index Cond: (p_type = 'SMALL ANODIZED BRASS'::text) Heap Fetches: 13245 Buffers: shared hit=977 read=10474 written=1321 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.96 rows=31 width=20) (actual time=0.033..0.326 rows=30 loops=13245) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=303762 read=149718 dirtied=647 written=19342 -> Hash (cost=484354.83..484354.83 rows=914247 width=8) (actual time=17151.234..17151.234 rows=910325 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35560kB Buffers: shared hit=401077 read=10839 -> Hash Join (cost=135979.69..484354.83 rows=914247 width=8) (actual time=3613.800..16666.447 rows=910325 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=401077 read=10839 -> Bitmap Heap Scan on orders (cost=96949.06..419039.60 rows=4571236 width=12) (actual time=2387.117..5241.897 rows=4557440 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=264591 read=1387 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95806.26 rows=4571236 width=0) (actual time=2295.506..2295.506 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=11069 read=1387 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1226.267..1226.267 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=136486 read=9452 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=33.584..1094.280 rows=299436 loops=1) Buffers: shared hit=136486 read=9452 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.048..0.103 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..0.016 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.023..0.023 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=0.019..0.021 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=26.618..204.273 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=136484 read=9452 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.924..17.924 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=483 read=351 -> 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=24296) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72741 read=277 written=6 -> 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=24296) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48592 Total runtime: 23394.741 ms (64 rows) COMMIT; COMMIT