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 = 'MEDIUM BURNISHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2100892.22..2100894.05 rows=732 width=38) (actual time=69754.139..69754.139 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=768307 read=229013 dirtied=393 written=59 -> HashAggregate (cost=2100844.58..2100857.39 rows=732 width=38) (actual time=69754.064..69754.066 rows=2 loops=1) Buffers: shared hit=768304 read=229013 dirtied=393 written=59 -> Nested Loop (cost=496212.21..2100380.76 rows=23191 width=38) (actual time=40369.318..69614.846 rows=23807 loops=1) Buffers: shared hit=768304 read=229013 dirtied=393 written=59 -> Nested Loop (cost=496212.21..2093766.69 rows=23191 width=16) (actual time=40369.239..67663.839 rows=23807 loops=1) Buffers: shared hit=720690 read=229013 dirtied=393 written=59 -> Hash Join (cost=496212.21..2087012.23 rows=23195 width=16) (actual time=40369.178..65772.057 rows=23807 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=649172 read=229011 dirtied=393 written=59 -> Nested Loop (cost=0.00..1588659.79 rows=381657 width=16) (actual time=0.545..23773.818 rows=398427 loops=1) Buffers: shared hit=285819 read=179939 dirtied=393 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..44397.89 rows=12687 width=4) (actual time=0.466..831.137 rows=13268 loops=1) Index Cond: (p_type = 'MEDIUM BURNISHED TIN'::text) Heap Fetches: 13268 Buffers: shared hit=2744 read=8671 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..121.41 rows=31 width=20) (actual time=0.198..1.708 rows=30 loops=13268) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=283075 read=171268 dirtied=393 -> Hash (cost=484782.68..484782.68 rows=914362 width=8) (actual time=40367.851..40367.851 rows=911247 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35596kB Buffers: shared hit=363350 read=49072 written=59 -> Hash Join (cost=135889.59..484782.68 rows=914362 width=8) (actual time=12794.310..39703.633 rows=911247 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=363350 read=49072 written=59 -> Bitmap Heap Scan on orders (cost=96858.97..419464.15 rows=4571812 width=12) (actual time=4797.088..17401.680 rows=4561956 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=253493 read=12991 written=59 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95716.02 rows=4571812 width=0) (actual time=4665.431..4665.431 rows=4570988 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=517 read=11939 written=59 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=7996.953..7996.953 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=109857 read=36081 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=57.665..7782.079 rows=299436 loops=1) Buffers: shared hit=109857 read=36081 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.048..0.113 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..0.019 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.021..0.021 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=0.016..0.017 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=55.768..1533.420 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=109855 read=36081 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=43.318..43.318 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=0.075..0.076 rows=1 loops=23807) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71518 read=2 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.075..0.076 rows=1 loops=23807) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=47614 Total runtime: 69768.852 ms (64 rows) COMMIT; COMMIT