BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'JORDAN' 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 = 'STANDARD BURNISHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1719438.94..1719440.76 rows=729 width=38) (actual time=11647.004..11647.005 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=2016137 read=281178 dirtied=389 written=58 -> HashAggregate (cost=1719391.52..1719404.27 rows=729 width=38) (actual time=11646.934..11646.936 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=2016134 read=281178 dirtied=389 written=58 -> Hash Join (cost=39448.99..1718907.66 rows=24193 width=38) (actual time=1173.852..11604.111 rows=24268 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=2016134 read=281178 dirtied=389 written=58 -> Nested Loop (cost=39447.42..1718452.47 rows=24193 width=16) (actual time=1173.789..11564.850 rows=24268 loops=1) Buffers: shared hit=2016130 read=281178 dirtied=389 written=58 -> Hash Join (cost=39447.13..1710646.29 rows=24193 width=16) (actual time=1173.769..11368.557 rows=24268 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1943194 read=281178 dirtied=389 written=58 -> Nested Loop (cost=416.45..1670920.05 rows=120965 width=20) (actual time=7.698..10077.501 rows=121792 loops=1) Buffers: shared hit=1833143 read=245074 dirtied=389 written=58 -> Nested Loop (cost=416.01..1475216.88 rows=399686 width=16) (actual time=7.436..4240.894 rows=401572 loops=1) Buffers: shared hit=285071 read=184650 dirtied=252 written=43 -> Bitmap Heap Scan on part (cost=411.29..28047.06 rows=13273 width=4) (actual time=7.343..128.425 rows=13366 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD BURNISHED NICKEL'::text) Heap Blocks: exact=11369 Buffers: shared hit=4837 read=6616 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..407.98 rows=13273 width=0) (actual time=5.141..5.141 rows=13366 loops=1) Index Cond: ((p_type)::text = 'STANDARD BURNISHED NICKEL'::text) Buffers: shared read=84 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.040..0.296 rows=30 loops=13366) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=402716 Buffers: shared hit=280234 read=178034 dirtied=252 written=43 -> 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=13366) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=39300 read=16252 written=4 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.014..0.014 rows=0 loops=401572) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1548072 read=60424 dirtied=137 written=15 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1161.130..1161.130 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=110051 read=36104 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.686..1048.746 rows=299838 loops=1) Buffers: shared hit=110051 read=36104 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.049..0.094 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=0.006..0.030 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.017..0.017 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=0.011..0.012 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=18.845..198.815 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=110049 read=36104 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.414..12.414 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> 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=24268) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72936 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.019..0.019 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=0.003..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.348 ms Execution time: 11648.103 ms (72 rows) COMMIT; COMMIT