BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'BRAZIL' 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 = 'LARGE BRUSHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2166961.87..2166963.69 rows=730 width=38) (actual time=26282.230..26282.231 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=783543 read=219366 dirtied=1082 written=38176 -> HashAggregate (cost=2166914.38..2166927.15 rows=730 width=38) (actual time=26282.135..26282.136 rows=2 loops=1) Buffers: shared hit=783540 read=219366 dirtied=1082 written=38176 -> Nested Loop (cost=497719.29..2166429.26 rows=24256 width=38) (actual time=19469.746..26230.505 rows=24128 loops=1) Buffers: shared hit=783540 read=219366 dirtied=1082 written=38176 -> Nested Loop (cost=497719.29..2159511.45 rows=24256 width=16) (actual time=19469.687..26109.693 rows=24128 loops=1) Buffers: shared hit=735284 read=219366 dirtied=1082 written=38176 -> Hash Join (cost=497719.29..2152440.46 rows=24282 width=16) (actual time=19469.634..25858.491 rows=24128 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=662770 read=219366 dirtied=1082 written=38176 -> Nested Loop (cost=0.00..1652475.79 rows=400511 width=16) (actual time=0.486..5209.072 rows=399378 loops=1) Buffers: shared hit=262868 read=205906 dirtied=1082 written=38176 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46164.77 rows=13273 width=4) (actual time=0.405..214.554 rows=13299 loops=1) Index Cond: (p_type = 'LARGE BRUSHED NICKEL'::text) Heap Fetches: 13299 Buffers: shared hit=2 read=11392 written=2020 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.71 rows=31 width=20) (actual time=0.035..0.363 rows=30 loops=13299) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=262866 read=194514 dirtied=1082 written=36156 -> Hash (cost=486283.49..486283.49 rows=914864 width=8) (actual time=19467.779..19467.779 rows=910359 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35561kB Buffers: shared hit=399899 read=13460 -> Hash Join (cost=136579.33..486283.49 rows=914864 width=8) (actual time=4099.758..18915.392 rows=910359 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=399899 read=13460 -> Bitmap Heap Scan on orders (cost=97548.71..420950.53 rows=4574321 width=12) (actual time=2854.058..6651.184 rows=4557140 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=254787 read=12634 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..96405.13 rows=4574321 width=0) (actual time=2751.009..2751.009 rows=4584480 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12634 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1245.072..1245.072 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=145112 read=826 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=38.523..1061.132 rows=299436 loops=1) Buffers: shared hit=145112 read=826 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.047..0.105 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..0.022 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: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.018..0.019 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=30.314..192.894 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145110 read=826 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=20.437..20.437 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=8 read=826 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.009..0.009 rows=1 loops=24128) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72514 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.003 rows=1 loops=24128) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48256 Total runtime: 26294.022 ms (64 rows) COMMIT; COMMIT