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=2229189.08..2229190.91 rows=733 width=38) (actual time=35988.950..35988.951 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=752658 read=262526 dirtied=2974 written=312 -> HashAggregate (cost=2229141.37..2229154.20 rows=733 width=38) (actual time=35988.839..35988.840 rows=2 loops=1) Buffers: shared hit=752655 read=262526 dirtied=2974 written=312 -> Nested Loop (cost=502555.99..2228632.35 rows=25451 width=38) (actual time=26345.381..35909.943 rows=24760 loops=1) Buffers: shared hit=752655 read=262526 dirtied=2974 written=312 -> Nested Loop (cost=502555.99..2221373.72 rows=25451 width=16) (actual time=26345.310..35643.328 rows=24760 loops=1) Buffers: shared hit=703135 read=262526 dirtied=2974 written=312 -> Hash Join (cost=502555.99..2213962.34 rows=25451 width=16) (actual time=26345.270..35188.596 rows=24760 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=628721 read=262526 dirtied=2974 written=312 -> Nested Loop (cost=0.00..1709060.65 rows=418237 width=16) (actual time=1.531..7670.637 rows=404582 loops=1) Buffers: shared hit=283032 read=193055 dirtied=2721 written=312 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47709.39 rows=13793 width=4) (actual time=1.405..341.604 rows=13487 loops=1) Index Cond: (p_type = 'SMALL BRUSHED NICKEL'::text) Heap Fetches: 13487 Buffers: shared hit=3 read=11599 written=18 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.14 rows=31 width=20) (actual time=0.055..0.527 rows=30 loops=13487) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=283029 read=181456 dirtied=2721 written=294 -> Hash (cost=491020.67..491020.67 rows=922826 width=8) (actual time=26342.594..26342.594 rows=911236 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35596kB Buffers: shared hit=345686 read=69471 dirtied=253 -> Hash Join (cost=139223.45..491020.67 rows=922826 width=8) (actual time=5748.714..25738.001 rows=911236 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=345686 read=69471 dirtied=253 -> Bitmap Heap Scan on orders (cost=100192.83..425458.80 rows=4614131 width=12) (actual time=3486.774..10713.018 rows=4561778 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=216238 read=52981 dirtied=253 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..99039.30 rows=4614131 width=0) (actual time=3376.041..3376.041 rows=4607485 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13165 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2261.652..2261.652 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=129448 read=16490 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=39.110..2082.345 rows=299436 loops=1) Buffers: shared hit=129448 read=16490 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.046..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=0.020..0.020 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=0.017..0.018 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=32.832..396.655 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=129446 read=16490 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=23.253..23.253 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=0.016..0.016 rows=1 loops=24760) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74414 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.007..0.008 rows=1 loops=24760) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49520 Total runtime: 35999.728 ms (64 rows) COMMIT; COMMIT