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 = 'SMALL PLATED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2191351.06..2191352.89 rows=729 width=38) (actual time=31375.166..31375.166 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=689630 read=323523 dirtied=3051 written=25954 -> HashAggregate (cost=2191303.64..2191316.40 rows=729 width=38) (actual time=31375.045..31375.048 rows=2 loops=1) Buffers: shared hit=689627 read=323523 dirtied=3051 written=25954 -> Nested Loop (cost=501874.48..2190810.26 rows=24669 width=38) (actual time=21616.960..31300.718 rows=24351 loops=1) Buffers: shared hit=689627 read=323523 dirtied=3051 written=25954 -> Nested Loop (cost=501874.48..2183774.66 rows=24669 width=16) (actual time=21616.892..31122.973 rows=24351 loops=1) Buffers: shared hit=640925 read=323523 dirtied=3051 written=25954 -> Hash Join (cost=501874.48..2176581.69 rows=24701 width=16) (actual time=21616.832..30759.521 rows=24351 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=567759 read=323523 dirtied=3051 written=25954 -> Nested Loop (cost=0.00..1672419.46 rows=408147 width=16) (actual time=0.499..7803.820 rows=403899 loops=1) Buffers: shared hit=189736 read=286119 dirtied=3051 written=25916 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46683.64 rows=13447 width=4) (actual time=0.429..275.059 rows=13442 loops=1) Index Cond: (p_type = 'SMALL PLATED NICKEL'::text) Heap Fetches: 13442 Buffers: shared hit=178 read=11327 written=1001 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.59 rows=31 width=20) (actual time=0.047..0.543 rows=30 loops=13442) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=189558 read=274792 dirtied=3051 written=24915 -> Hash (cost=490390.98..490390.98 rows=918680 width=8) (actual time=21615.255..21615.255 rows=911207 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35595kB Buffers: shared hit=378020 read=37404 written=38 -> Hash Join (cost=138770.95..490390.98 rows=918680 width=8) (actual time=4863.035..21086.730 rows=911207 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=378020 read=37404 written=38 -> Bitmap Heap Scan on orders (cost=99740.33..424948.31 rows=4593399 width=12) (actual time=3420.863..7655.162 rows=4561761 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=253286 read=16200 written=38 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98591.98 rows=4593399 width=0) (actual time=3173.165..3173.165 rows=4612043 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13179 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1441.910..1441.910 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=124734 read=21204 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=31.679..1270.488 rows=299436 loops=1) Buffers: shared hit=124734 read=21204 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.036..0.106 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..0.028 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.015..0.015 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=0.012..0.013 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=28.475..236.507 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=124732 read=21204 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=19.370..19.370 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=827 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.012..0.013 rows=1 loops=24351) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73166 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.004..0.004 rows=1 loops=24351) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48702 Total runtime: 31397.059 ms (64 rows) COMMIT; COMMIT