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 = 'LARGE PLATED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1731876.76..1731878.58 rows=729 width=38) (actual time=10717.525..10717.526 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=1787502 read=230065 dirtied=279 written=108 -> HashAggregate (cost=1731829.34..1731842.10 rows=729 width=38) (actual time=10717.466..10717.467 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1787499 read=230065 dirtied=279 written=108 -> Hash Join (cost=39449.71..1731340.40 rows=24447 width=38) (actual time=888.895..10677.238 rows=24158 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1787499 read=230065 dirtied=279 written=108 -> Nested Loop (cost=39448.15..1730880.46 rows=24447 width=16) (actual time=888.820..10641.267 rows=24158 loops=1) Buffers: shared hit=1787495 read=230065 dirtied=279 written=108 -> Hash Join (cost=39447.86..1722992.32 rows=24447 width=16) (actual time=888.796..10431.999 rows=24158 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1714880 read=230065 dirtied=279 written=108 -> Nested Loop (cost=417.17..1683258.79 rows=122235 width=20) (actual time=7.109..9470.232 rows=121182 loops=1) Buffers: shared hit=1574605 read=224164 dirtied=279 written=105 -> Nested Loop (cost=416.74..1485578.55 rows=403717 width=16) (actual time=7.065..4814.226 rows=401801 loops=1) Buffers: shared hit=284303 read=186553 dirtied=215 written=84 -> Bitmap Heap Scan on part (cost=412.02..28159.98 rows=13367 width=4) (actual time=6.952..144.822 rows=13404 loops=1) Recheck Cond: ((p_type)::text = 'LARGE PLATED BRASS'::text) Heap Blocks: exact=11418 Buffers: shared hit=4523 read=6965 written=4 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..408.68 rows=13367 width=0) (actual time=4.701..4.701 rows=13404 loops=1) Index Cond: ((p_type)::text = 'LARGE PLATED BRASS'::text) Buffers: shared read=70 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.044..0.337 rows=30 loops=13404) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=403691 Buffers: shared hit=279780 read=179588 dirtied=215 written=80 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.028..0.028 rows=30 loops=13404) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=39500 read=16177 written=9 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.011 rows=0 loops=401801) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1290302 read=37611 dirtied=64 written=21 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=878.248..878.248 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=140275 read=5901 written=3 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=20.465..787.763 rows=300963 loops=1) Buffers: shared hit=140275 read=5901 written=3 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.042..0.069 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=0.019..0.019 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=0.014..0.015 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=19.223..146.655 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=140273 read=5901 written=3 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.642..12.642 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=832 written=3 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.008 rows=1 loops=24158) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72615 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.020..0.020 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=0.003..0.005 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.858 ms Execution time: 10718.351 ms (70 rows) COMMIT; COMMIT