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 = 'MEDIUM BURNISHED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2236130.99..2236132.82 rows=732 width=38) (actual time=58850.003..58850.004 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=712973 read=302332 dirtied=2424 written=3187 -> HashAggregate (cost=2236083.36..2236096.17 rows=732 width=38) (actual time=58849.913..58849.915 rows=2 loops=1) Buffers: shared hit=712970 read=302332 dirtied=2424 written=3187 -> Nested Loop (cost=501830.26..2235572.86 rows=25525 width=38) (actual time=30814.031..58724.390 rows=24632 loops=1) Buffers: shared hit=712970 read=302332 dirtied=2424 written=3187 -> Nested Loop (cost=501830.26..2228293.13 rows=25525 width=16) (actual time=30813.965..57238.540 rows=24632 loops=1) Buffers: shared hit=663706 read=302332 dirtied=2424 written=3187 -> Hash Join (cost=501830.26..2220859.03 rows=25529 width=16) (actual time=30813.915..55644.466 rows=24632 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=589671 read=302332 dirtied=2424 written=3187 -> Nested Loop (cost=0.00..1716673.19 rows=420058 width=16) (actual time=0.539..23541.545 rows=404741 loops=1) Buffers: shared hit=227272 read=249602 dirtied=2415 written=2644 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47926.47 rows=13867 width=4) (actual time=0.417..589.415 rows=13527 loops=1) Index Cond: (p_type = 'MEDIUM BURNISHED STEEL'::text) Heap Fetches: 13527 Buffers: shared hit=5464 read=6206 written=64 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.03 rows=31 width=20) (actual time=0.177..1.677 rows=30 loops=13527) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=221808 read=243396 dirtied=2415 written=2580 -> Hash (cost=490320.96..490320.96 rows=920744 width=8) (actual time=30812.105..30812.105 rows=912917 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35661kB Buffers: shared hit=362396 read=52730 dirtied=9 written=543 -> Hash Join (cost=138992.75..490320.96 rows=920744 width=8) (actual time=9095.696..30185.844 rows=912917 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=362396 read=52730 dirtied=9 written=543 -> Bitmap Heap Scan on orders (cost=99962.13..424818.94 rows=4603721 width=12) (actual time=4344.505..12522.550 rows=4557089 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=252326 read=16623 dirtied=9 written=543 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98811.20 rows=4603721 width=0) (actual time=4177.667..4177.667 rows=4602796 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13148 written=282 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=4750.906..4750.906 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=110070 read=36107 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=51.812..4533.379 rows=300963 loops=1) Buffers: shared hit=110070 read=36107 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.045..0.110 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..0.022 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=0.017..0.018 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=46.125..884.192 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=110068 read=36107 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=36.163..36.163 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=0.061..0.061 rows=1 loops=24632) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74035 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.055..0.055 rows=1 loops=24632) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49264 Total runtime: 58858.386 ms (64 rows) COMMIT; COMMIT