BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'UNITED STATES' 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 PLATED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2193705.15..2193706.98 rows=732 width=38) (actual time=64051.902..64051.902 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=770952 read=233949 dirtied=2126 written=113 -> HashAggregate (cost=2193657.51..2193670.32 rows=732 width=38) (actual time=64051.810..64051.812 rows=2 loops=1) Buffers: shared hit=770949 read=233949 dirtied=2126 written=113 -> Nested Loop (cost=501830.26..2193161.51 rows=24800 width=38) (actual time=37934.139..63924.488 rows=24450 loops=1) Buffers: shared hit=770949 read=233949 dirtied=2126 written=113 -> Nested Loop (cost=501830.26..2186088.55 rows=24800 width=16) (actual time=37934.031..62474.112 rows=24450 loops=1) Buffers: shared hit=722049 read=233949 dirtied=2126 written=113 -> Hash Join (cost=501830.26..2178865.57 rows=24804 width=16) (actual time=37933.986..60830.705 rows=24450 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=648561 read=233949 dirtied=2126 written=113 -> Nested Loop (cost=0.00..1674746.66 rows=408123 width=16) (actual time=0.523..21327.764 rows=397814 loops=1) Buffers: shared hit=235658 read=231962 dirtied=2126 written=113 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46759.60 rows=13473 width=4) (actual time=0.416..564.073 rows=13246 loops=1) Index Cond: (p_type = 'ECONOMY PLATED COPPER'::text) Heap Fetches: 13246 Buffers: shared hit=5530 read=5935 written=1 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.52 rows=31 width=20) (actual time=0.163..1.548 rows=30 loops=13246) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=230128 read=226027 dirtied=2126 written=112 -> Hash (cost=490320.96..490320.96 rows=920744 width=8) (actual time=37931.804..37931.804 rows=911249 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35596kB Buffers: shared hit=412900 read=1987 -> Hash Join (cost=138992.75..490320.96 rows=920744 width=8) (actual time=8770.987..37229.744 rows=911249 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=412900 read=1987 -> Bitmap Heap Scan on orders (cost=99962.13..424818.94 rows=4603721 width=12) (actual time=3875.511..16910.892 rows=4561673 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=267783 read=1166 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98811.20 rows=4603721 width=0) (actual time=3709.327..3709.327 rows=4602796 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=13148 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=4895.200..4895.200 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=145117 read=821 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=50.292..4678.301 rows=299436 loops=1) Buffers: shared hit=145117 read=821 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.034..0.158 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=0.007..0.021 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.017..0.017 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=0.014..0.015 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=43.664..913.840 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145115 read=821 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=33.038..33.038 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=13 read=821 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.063..0.064 rows=1 loops=24450) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73488 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.054..0.054 rows=1 loops=24450) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48900 Total runtime: 64072.312 ms (64 rows) COMMIT; COMMIT