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 = 'SMALL ANODIZED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2187890.02..2187891.85 rows=732 width=38) (actual time=72430.715..72430.715 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=709981 read=298202 dirtied=3245 -> HashAggregate (cost=2187842.38..2187855.19 rows=732 width=38) (actual time=72430.628..72430.630 rows=2 loops=1) Buffers: shared hit=709978 read=298202 dirtied=3245 -> Nested Loop (cost=504121.92..2187347.10 rows=24764 width=38) (actual time=40854.488..72303.053 rows=24162 loops=1) Buffers: shared hit=709978 read=298202 dirtied=3245 -> Nested Loop (cost=504121.92..2180284.41 rows=24764 width=16) (actual time=40854.418..70289.879 rows=24162 loops=1) Buffers: shared hit=661654 read=298202 dirtied=3245 -> Hash Join (cost=504121.92..2173071.93 rows=24768 width=16) (actual time=40854.099..68322.905 rows=24162 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=589048 read=298202 dirtied=3245 -> Nested Loop (cost=0.00..1666664.69 rows=407529 width=16) (actual time=0.586..26225.178 rows=399326 loops=1) Buffers: shared hit=235649 read=235378 dirtied=3245 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46506.10 rows=13387 width=4) (actual time=0.391..746.688 rows=13289 loops=1) Index Cond: (p_type = 'SMALL ANODIZED NICKEL'::text) Heap Fetches: 13289 Buffers: shared hit=3866 read=7615 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.71 rows=31 width=20) (actual time=0.218..1.896 rows=30 loops=13289) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=231783 read=227763 dirtied=3245 -> Hash (cost=492555.71..492555.71 rows=925297 width=8) (actual time=40851.907..40851.907 rows=911232 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35595kB Buffers: shared hit=353396 read=62824 -> Hash Join (cost=139490.11..492555.71 rows=925297 width=8) (actual time=10395.739..40180.870 rows=911232 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=353396 read=62824 -> Bitmap Heap Scan on orders (cost=100459.49..426922.79 rows=4626487 width=12) (actual time=5033.639..20735.371 rows=4561762 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=212453 read=57829 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..99302.87 rows=4626487 width=0) (actual time=4900.613..4900.613 rows=4625776 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13216 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=5361.767..5361.767 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=140943 read=4995 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=61.668..5143.862 rows=299436 loops=1) Buffers: shared hit=140943 read=4995 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=2.251..2.321 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=2.189..2.205 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.025..0.025 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=0.021..0.022 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=53.004..1006.760 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=140941 read=4995 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=41.058..41.058 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=0.077..0.078 rows=1 loops=24162) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72606 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.076..0.077 rows=1 loops=24162) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48324 Total runtime: 72441.855 ms (64 rows) COMMIT; COMMIT