BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'PERU' 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 = 'LARGE ANODIZED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2200251.11..2200252.94 rows=732 width=38) (actual time=61998.803..61998.804 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=809897 read=202223 dirtied=2751 written=5545 -> HashAggregate (cost=2200203.47..2200216.28 rows=732 width=38) (actual time=61998.712..61998.714 rows=2 loops=1) Buffers: shared hit=809894 read=202223 dirtied=2751 written=5545 -> Nested Loop (cost=502295.79..2199704.99 rows=24924 width=38) (actual time=32909.267..61876.188 rows=24460 loops=1) Buffers: shared hit=809894 read=202223 dirtied=2751 written=5545 -> Nested Loop (cost=502295.79..2192596.66 rows=24924 width=16) (actual time=32909.151..60124.632 rows=24460 loops=1) Buffers: shared hit=760974 read=202223 dirtied=2751 written=5545 -> Hash Join (cost=502295.79..2185337.58 rows=24928 width=16) (actual time=32909.092..58213.669 rows=24460 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=687468 read=202223 dirtied=2751 written=5545 -> Nested Loop (cost=0.00..1680741.67 rows=410168 width=16) (actual time=0.815..24015.824 rows=403341 loops=1) Buffers: shared hit=272968 read=201563 dirtied=2751 written=5545 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46920.54 rows=13527 width=4) (actual time=0.705..761.639 rows=13407 loops=1) Index Cond: (p_type = 'LARGE ANODIZED TIN'::text) Heap Fetches: 13407 Buffers: shared hit=4194 read=7354 written=211 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.47 rows=31 width=20) (actual time=0.193..1.715 rows=30 loops=13407) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=268774 read=194209 dirtied=2751 written=5334 -> Hash (cost=490775.11..490775.11 rows=921655 width=8) (actual time=32907.054..32907.054 rows=911236 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35596kB Buffers: shared hit=414497 read=660 -> Hash Join (cost=139099.42..490775.11 rows=921655 width=8) (actual time=7268.847..32293.306 rows=911236 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=414497 read=660 -> Bitmap Heap Scan on orders (cost=100068.80..425246.91 rows=4608274 width=12) (actual time=3499.278..14609.931 rows=4561778 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=269219 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98916.73 rows=4608274 width=0) (actual time=3371.248..3371.248 rows=4607485 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=13165 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=3769.014..3769.014 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=145278 read=660 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=48.384..3560.923 rows=299436 loops=1) Buffers: shared hit=145278 read=660 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.054..0.104 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=0.008..0.020 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.024..0.024 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=0.020..0.022 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=43.908..691.800 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145276 read=660 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=33.739..33.739 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=174 read=660 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.074..0.075 rows=1 loops=24460) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73506 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.066..0.066 rows=1 loops=24460) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48920 Total runtime: 62009.970 ms (64 rows) COMMIT; COMMIT