BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'UNITED KINGDOM' 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 ANODIZED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1692584.82..1692586.65 rows=729 width=38) (actual time=10046.891..10046.891 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=1800355 read=217446 dirtied=1805 written=622 -> HashAggregate (cost=1692537.40..1692550.16 rows=729 width=38) (actual time=10046.829..10046.831 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1800352 read=217446 dirtied=1805 written=622 -> Hash Join (cost=39434.41..1692061.94 rows=23773 width=38) (actual time=834.136..10009.444 rows=24523 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1800352 read=217446 dirtied=1805 written=622 -> Nested Loop (cost=39432.85..1691614.64 rows=23773 width=16) (actual time=834.070..9975.581 rows=24523 loops=1) Buffers: shared hit=1800348 read=217446 dirtied=1805 written=622 -> Hash Join (cost=39432.55..1683943.99 rows=23773 width=16) (actual time=834.045..9767.797 rows=24523 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1726661 read=217446 dirtied=1805 written=622 -> Nested Loop (cost=401.87..1644229.83 rows=118866 width=20) (actual time=7.844..8862.913 rows=121598 loops=1) Buffers: shared hit=1581315 read=216616 dirtied=1805 written=618 -> Nested Loop (cost=401.43..1451995.66 rows=392588 width=16) (actual time=7.766..4294.149 rows=401324 loops=1) Buffers: shared hit=281758 read=189169 dirtied=1676 written=540 -> Bitmap Heap Scan on part (cost=400.87..27655.78 rows=12960 width=4) (actual time=7.658..189.551 rows=13378 loops=1) Recheck Cond: ((p_type)::text = 'LARGE ANODIZED BRASS'::text) Heap Blocks: exact=11490 Buffers: shared hit=793 read=10780 written=30 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..397.63 rows=12960 width=0) (actual time=5.311..5.311 rows=13378 loops=1) Index Cond: ((p_type)::text = 'LARGE ANODIZED BRASS'::text) Buffers: shared read=83 written=1 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.59 rows=31 width=20) (actual time=0.028..0.297 rows=30 loops=13378) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=280965 read=178389 dirtied=1676 written=510 -> 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=401324) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1299557 read=27447 dirtied=129 written=78 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=823.137..823.137 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=145346 read=830 written=4 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=22.242..736.246 rows=300963 loops=1) Buffers: shared hit=145346 read=830 written=4 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.053..0.083 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..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.022..0.022 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=18.900..136.880 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=145344 read=830 written=4 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.311..12.311 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=9 read=829 written=4 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=24523) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73687 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.025..0.025 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=0.006..0.010 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.575 ms Execution time: 10047.738 ms (66 rows) COMMIT; COMMIT