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 = 'PROMO POLISHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1726313.17..1726314.99 rows=730 width=38) (actual time=11927.825..11927.826 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=1996968 read=342556 dirtied=2479 written=168 -> HashAggregate (cost=1726265.68..1726278.45 rows=730 width=38) (actual time=11927.757..11927.758 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1996965 read=342556 dirtied=2479 written=168 -> Hash Join (cost=39444.79..1725779.10 rows=24329 width=38) (actual time=878.158..11886.630 rows=24903 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1996965 read=342556 dirtied=2479 written=168 -> Nested Loop (cost=39443.22..1725321.36 rows=24329 width=16) (actual time=878.095..11851.054 rows=24903 loops=1) Buffers: shared hit=1996961 read=342556 dirtied=2479 written=168 -> Hash Join (cost=39442.93..1717463.25 rows=24354 width=16) (actual time=878.081..11654.334 rows=24903 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1922086 read=342556 dirtied=2479 written=168 -> Nested Loop (cost=412.25..1677732.39 rows=121770 width=20) (actual time=8.194..10698.745 rows=124121 loops=1) Buffers: shared hit=1782144 read=336322 dirtied=2479 written=168 -> Nested Loop (cost=411.81..1480945.81 rows=401885 width=16) (actual time=8.103..4394.404 rows=409065 loops=1) Buffers: shared hit=258734 read=221324 dirtied=2183 written=118 -> Bitmap Heap Scan on part (cost=411.25..28038.87 rows=13267 width=4) (actual time=8.008..155.168 rows=13596 loops=1) Recheck Cond: ((p_type)::text = 'PROMO POLISHED BRASS'::text) Heap Blocks: exact=11590 Buffers: shared hit=3244 read=8431 written=7 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..407.93 rows=13267 width=0) (actual time=5.634..5.634 rows=13596 loops=1) Index Cond: ((p_type)::text = 'PROMO POLISHED BRASS'::text) Buffers: shared read=85 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.20 rows=31 width=20) (actual time=0.029..0.302 rows=30 loops=13596) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=255490 read=212893 dirtied=2183 written=111 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.015..0.015 rows=0 loops=409065) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1523410 read=114998 dirtied=296 written=50 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=866.227..866.227 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=139942 read=6234 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.303..766.620 rows=300963 loops=1) Buffers: shared hit=139942 read=6234 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.061..0.088 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=0.010..0.017 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: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.013..0.014 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=18.356..142.590 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=139940 read=6234 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.038..12.038 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=831 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=24903) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74875 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.028..0.028 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.007..0.013 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.528 ms Execution time: 11928.623 ms (68 rows) COMMIT; COMMIT