BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'IRAQ' 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 = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'SMALL BRUSHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1749204.25..1749206.07 rows=727 width=38) (actual time=10937.916..10937.917 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=1785491 read=246519 dirtied=151 written=279 -> HashAggregate (cost=1749156.98..1749169.70 rows=727 width=38) (actual time=10937.854..10937.856 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1785488 read=246519 dirtied=151 written=279 -> Hash Join (cost=39454.74..1748662.74 rows=24712 width=38) (actual time=858.972..10896.737 rows=24526 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1785488 read=246519 dirtied=151 written=279 -> Nested Loop (cost=39453.18..1748197.83 rows=24712 width=16) (actual time=858.906..10861.251 rows=24526 loops=1) Buffers: shared hit=1785484 read=246519 dirtied=151 written=279 -> Hash Join (cost=39452.89..1740224.20 rows=24712 width=16) (actual time=858.884..10651.307 rows=24526 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1711772 read=246519 dirtied=151 written=279 -> Nested Loop (cost=422.20..1700483.04 rows=123561 width=20) (actual time=7.445..9713.867 rows=122267 loops=1) Buffers: shared hit=1566442 read=245694 dirtied=151 written=279 -> Nested Loop (cost=421.77..1500238.56 rows=408947 width=16) (actual time=7.260..4754.703 rows=404635 loops=1) Buffers: shared hit=277266 read=197374 dirtied=145 written=222 -> Bitmap Heap Scan on part (cost=417.05..28323.50 rows=13500 width=4) (actual time=7.110..135.977 rows=13459 loops=1) Recheck Cond: ((p_type)::text = 'SMALL BRUSHED TIN'::text) Heap Blocks: exact=11466 Buffers: shared hit=5442 read=6093 written=7 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.68 rows=13500 width=0) (actual time=4.840..4.840 rows=13459 loops=1) Index Cond: ((p_type)::text = 'SMALL BRUSHED TIN'::text) Buffers: shared hit=1 read=68 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.042..0.331 rows=30 loops=13459) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=407253 Buffers: shared hit=271824 read=191281 dirtied=145 written=215 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.026..0.026 rows=30 loops=13459) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=41670 read=14182 written=17 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.012 rows=0 loops=404635) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1289176 read=48320 dirtied=6 written=57 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=847.746..847.746 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=145330 read=825 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=23.282..749.140 rows=299838 loops=1) Buffers: shared hit=145330 read=825 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.053..0.109 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..0.039 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.024..0.024 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=0.018..0.019 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::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=19.492..138.736 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=145328 read=825 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.891..12.891 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=12 read=824 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=24526) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73712 -> 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..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.348 ms Execution time: 10938.896 ms (70 rows) COMMIT; COMMIT