BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'FRANCE' 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 = 'EUROPE' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'STANDARD BRUSHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2163670.64..2163672.47 rows=733 width=38) (actual time=28038.340..28038.341 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=776075 read=223959 dirtied=2397 written=39 -> HashAggregate (cost=2163622.93..2163635.76 rows=733 width=38) (actual time=28038.280..28038.280 rows=2 loops=1) Buffers: shared hit=776072 read=223959 dirtied=2397 written=39 -> Nested Loop (cost=501604.55..2163136.77 rows=24308 width=38) (actual time=21126.564..27981.369 rows=24025 loops=1) Buffers: shared hit=776072 read=223959 dirtied=2397 written=39 -> Nested Loop (cost=501604.55..2156204.13 rows=24308 width=16) (actual time=21126.484..27826.592 rows=24025 loops=1) Buffers: shared hit=728022 read=223959 dirtied=2397 written=39 -> Hash Join (cost=501604.55..2149125.58 rows=24308 width=16) (actual time=21126.437..27523.058 rows=24025 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=655814 read=223959 dirtied=2397 written=39 -> Nested Loop (cost=0.00..1645280.66 rows=399459 width=16) (actual time=0.550..5280.556 rows=395760 loops=1) Buffers: shared hit=256512 read=208401 dirtied=2144 written=39 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45947.04 rows=13200 width=4) (actual time=0.440..82.281 rows=13179 loops=1) Index Cond: (p_type = 'STANDARD BRUSHED COPPER'::text) Heap Fetches: 13179 Buffers: shared hit=10924 read=467 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.85 rows=31 width=20) (actual time=0.037..0.381 rows=30 loops=13179) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=245588 read=207934 dirtied=2144 written=39 -> Hash (cost=490092.01..490092.01 rows=921003 width=8) (actual time=21124.720..21124.720 rows=913776 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35695kB Buffers: shared hit=399299 read=15558 dirtied=253 -> Hash Join (cost=138989.99..490092.01 rows=921003 width=8) (actual time=4604.443..20232.206 rows=913776 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=399299 read=15558 dirtied=253 -> Bitmap Heap Scan on orders (cost=99959.37..424582.56 rows=4605013 width=12) (actual time=3099.726..7628.496 rows=4561632 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=253955 read=14725 dirtied=253 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98808.11 rows=4605013 width=0) (actual time=2958.539..2958.539 rows=4598186 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13132 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1504.266..1504.266 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=145344 read=833 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=37.557..1310.934 rows=300963 loops=1) Buffers: shared hit=145344 read=833 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.043..0.084 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..0.013 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: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.018..0.019 rows=1 loops=1) Filter: (r_name = 'EUROPE'::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=33.558..240.377 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145342 read=833 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=23.164..23.164 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=833 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.011..0.011 rows=1 loops=24025) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72208 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.004..0.004 rows=1 loops=24025) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48050 Total runtime: 28054.020 ms (64 rows) COMMIT; COMMIT