BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'ARGENTINA' 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 BURNISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1743803.81..1743805.63 rows=729 width=38) (actual time=10851.603..10851.604 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=1787866 read=226022 written=1475 -> HashAggregate (cost=1743756.39..1743769.15 rows=729 width=38) (actual time=10851.541..10851.541 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1787863 read=226022 written=1475 -> Hash Join (cost=39454.49..1743265.25 rows=24557 width=38) (actual time=856.380..10809.553 rows=24325 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1787863 read=226022 written=1475 -> Nested Loop (cost=39452.93..1742803.25 rows=24557 width=16) (actual time=856.319..10772.786 rows=24325 loops=1) Buffers: shared hit=1787859 read=226022 written=1475 -> Hash Join (cost=39452.63..1734879.61 rows=24557 width=16) (actual time=856.297..10558.959 rows=24325 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1714763 read=226022 written=1475 -> Nested Loop (cost=421.95..1695142.92 rows=122783 width=20) (actual time=7.772..9618.328 rows=122086 loops=1) Buffers: shared hit=1569659 read=225189 written=1421 -> Nested Loop (cost=421.51..1496587.26 rows=405527 width=16) (actual time=7.476..4866.636 rows=400738 loops=1) Buffers: shared hit=267865 read=201225 written=1297 -> Bitmap Heap Scan on part (cost=416.80..28284.51 rows=13467 width=4) (actual time=7.326..182.819 rows=13317 loops=1) Recheck Cond: ((p_type)::text = 'LARGE BURNISHED COPPER'::text) Heap Blocks: exact=11393 Buffers: shared hit=1354 read=10122 written=18 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.43 rows=13467 width=0) (actual time=4.994..4.994 rows=13317 loops=1) Index Cond: ((p_type)::text = 'LARGE BURNISHED COPPER'::text) Buffers: shared read=83 written=4 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.041..0.340 rows=30 loops=13317) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=402236 Buffers: shared hit=266511 read=191103 written=1279 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.028..0.028 rows=30 loops=13317) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=39703 read=15675 written=100 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.011 rows=0 loops=400738) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1301794 read=23964 written=124 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=844.312..844.312 rows=299436 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14624kB Buffers: shared hit=145104 read=833 written=54 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.805..740.715 rows=299436 loops=1) Buffers: shared hit=145104 read=833 written=54 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.039..0.072 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=0.016..0.016 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=0.011..0.012 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=20.311..137.064 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145102 Buffers: shared hit=145102 read=833 written=54 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=13.305..13.305 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=826 written=53 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.008 rows=1 loops=24325) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73096 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.023..0.023 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..0.009 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.243 ms Execution time: 10852.413 ms (70 rows) COMMIT; COMMIT