BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'PERU' 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 = 'AMERICA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'ECONOMY ANODIZED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1747077.02..1747078.85 rows=729 width=38) (actual time=12197.782..12197.783 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=1796157 read=265768 dirtied=109 written=21 -> HashAggregate (cost=1747029.60..1747042.36 rows=729 width=38) (actual time=12197.723..12197.724 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1796154 read=265768 dirtied=109 written=21 -> Hash Join (cost=39454.69..1746537.52 rows=24604 width=38) (actual time=1128.806..12156.125 rows=24945 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1796154 read=265768 dirtied=109 written=21 -> Nested Loop (cost=39453.13..1746074.64 rows=24604 width=16) (actual time=1128.745..12117.501 rows=24945 loops=1) Buffers: shared hit=1796150 read=265768 dirtied=109 written=21 -> Hash Join (cost=39452.84..1738135.83 rows=24604 width=16) (actual time=1128.721..11884.988 rows=24945 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1721193 read=265768 dirtied=109 written=21 -> Nested Loop (cost=422.15..1698397.78 rows=123020 width=20) (actual time=8.898..10681.034 rows=124806 loops=1) Buffers: shared hit=1595165 read=245859 dirtied=109 written=21 -> Nested Loop (cost=421.71..1499451.20 rows=406310 width=16) (actual time=8.344..5388.195 rows=411271 loops=1) Buffers: shared hit=267251 read=213734 dirtied=90 written=20 -> Bitmap Heap Scan on part (cost=417.00..28315.38 rows=13493 width=4) (actual time=8.209..149.316 rows=13678 loops=1) Recheck Cond: ((p_type)::text = 'ECONOMY ANODIZED COPPER'::text) Heap Blocks: exact=11655 Buffers: shared hit=5252 read=6489 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.62 rows=13493 width=0) (actual time=5.862..5.862 rows=13678 loops=1) Index Cond: ((p_type)::text = 'ECONOMY ANODIZED COPPER'::text) Buffers: shared read=86 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.045..0.372 rows=30 loops=13678) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=412401 Buffers: shared hit=261999 read=207245 dirtied=90 written=20 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.030..0.030 rows=30 loops=13678) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=40462 read=16381 written=1 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=411271) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1327914 read=32125 dirtied=19 written=1 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1116.441..1116.441 rows=299436 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14624kB Buffers: shared hit=126028 read=19909 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=23.499..1023.529 rows=299436 loops=1) Buffers: shared hit=126028 read=19909 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.051..0.089 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=0.006..0.016 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=0.017..0.018 rows=1 loops=1) Filter: (r_name = 'AMERICA'::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=21.113..193.623 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145102 Buffers: shared hit=126026 read=19909 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=13.969..13.969 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=826 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.008 rows=1 loops=24945) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74957 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.019..0.019 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=0.004..0.005 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.497 ms Execution time: 12198.510 ms (70 rows) COMMIT; COMMIT