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 = 'SMALL BRUSHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1787528.26..1787530.09 rows=732 width=38) (actual time=13113.186..13113.187 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=1780262 read=251360 dirtied=1556 written=7490 -> HashAggregate (cost=1787480.62..1787493.43 rows=732 width=38) (actual time=13113.114..13113.115 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1780259 read=251360 dirtied=1556 written=7490 -> Hash Join (cost=39461.17..1786971.50 rows=25456 width=38) (actual time=1978.682..13061.190 rows=24745 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1780259 read=251360 dirtied=1556 written=7490 -> Nested Loop (cost=39459.61..1786492.64 rows=25456 width=16) (actual time=1978.599..13012.198 rows=24745 loops=1) Buffers: shared hit=1780255 read=251360 dirtied=1556 written=7490 -> Hash Join (cost=39459.32..1778278.95 rows=25456 width=16) (actual time=1978.575..12762.983 rows=24745 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1705886 read=251360 dirtied=1556 written=7490 -> Nested Loop (cost=428.63..1738516.40 rows=127282 width=20) (actual time=10.361..10674.126 rows=123126 loops=1) Buffers: shared hit=1584332 read=226977 dirtied=1556 written=7483 -> Nested Loop (cost=428.20..1533538.95 rows=418615 width=16) (actual time=10.204..5126.248 rows=404100 loops=1) Buffers: shared hit=277899 read=196598 dirtied=1556 written=6389 -> Bitmap Heap Scan on part (cost=427.63..28724.37 rows=13833 width=4) (actual time=10.089..212.099 rows=13487 loops=1) Recheck Cond: ((p_type)::text = 'SMALL BRUSHED NICKEL'::text) Heap Blocks: exact=11514 Buffers: shared hit=1708 read=9891 written=340 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..424.18 rows=13833 width=0) (actual time=7.074..7.074 rows=13487 loops=1) Index Cond: ((p_type)::text = 'SMALL BRUSHED NICKEL'::text) Buffers: shared read=85 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.47 rows=31 width=20) (actual time=0.033..0.351 rows=30 loops=13487) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=276191 read=186707 dirtied=1556 written=6049 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.013..0.013 rows=0 loops=404100) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1306433 read=30379 written=1094 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1128.410..1128.410 rows=299436 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14624kB Buffers: shared hit=121554 read=24383 written=7 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=28.474..1001.341 rows=299436 loops=1) Buffers: shared hit=121554 read=24383 written=7 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.106..0.154 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=0.017..0.033 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.037..0.037 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=0.027..0.029 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=20.745..188.329 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145102 Buffers: shared hit=121552 read=24383 written=7 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=13.663..13.663 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=826 written=1 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.009 rows=1 loops=24745) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74369 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.032..0.032 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=0.006..0.013 rows=25 loops=1) Buffers: shared hit=1 Planning time: 11.233 ms Execution time: 13114.049 ms (66 rows) COMMIT; COMMIT