BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'IRAN' 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 = 'MEDIUM BRUSHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1693614.68..1693616.50 rows=727 width=38) (actual time=10509.894..10509.895 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=1771744 read=235292 dirtied=374 written=5282 -> HashAggregate (cost=1693567.40..1693580.13 rows=727 width=38) (actual time=10509.827..10509.828 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1771741 read=235292 dirtied=374 written=5282 -> Hash Join (cost=39434.66..1693094.66 rows=23637 width=38) (actual time=807.984..10469.418 rows=24344 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1771741 read=235292 dirtied=374 written=5282 -> Nested Loop (cost=39433.10..1692649.91 rows=23637 width=16) (actual time=807.916..10431.298 rows=24344 loops=1) Buffers: shared hit=1771737 read=235292 dirtied=374 written=5282 -> Hash Join (cost=39432.81..1685023.12 rows=23637 width=16) (actual time=807.893..10227.134 rows=24344 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1698567 read=235292 dirtied=374 written=5282 -> Nested Loop (cost=402.12..1645312.87 rows=118186 width=20) (actual time=7.527..9306.587 rows=121261 loops=1) Buffers: shared hit=1553767 read=233937 dirtied=374 written=5237 -> Nested Loop (cost=401.69..1453792.18 rows=391158 width=16) (actual time=7.467..4607.150 rows=399217 loops=1) Buffers: shared hit=261721 read=205661 dirtied=374 written=4641 -> Bitmap Heap Scan on part (cost=401.12..27695.71 rows=12993 width=4) (actual time=7.393..190.820 rows=13305 loops=1) Recheck Cond: ((p_type)::text = 'MEDIUM BRUSHED COPPER'::text) Heap Blocks: exact=11358 Buffers: shared hit=528 read=10913 written=240 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..397.88 rows=12993 width=0) (actual time=5.153..5.153 rows=13305 loops=1) Index Cond: ((p_type)::text = 'MEDIUM BRUSHED COPPER'::text) Buffers: shared read=83 written=2 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.45 rows=31 width=20) (actual time=0.029..0.321 rows=30 loops=13305) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=261193 read=194748 dirtied=374 written=4401 -> 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=399217) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1292046 read=28276 written=596 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=795.153..795.153 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=144800 read=1355 written=45 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.450..705.072 rows=299838 loops=1) Buffers: shared hit=144800 read=1355 written=45 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.049..0.076 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=0.005..0.013 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: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.014..0.015 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=18.216..130.774 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=144798 read=1355 written=45 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=11.953..11.953 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 written=35 -> 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=24344) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73170 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.024..0.024 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=0.005..0.010 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.326 ms Execution time: 10511.326 ms (66 rows) COMMIT; COMMIT