BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'JAPAN' 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 = 'ASIA' 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=1727299.63..1727301.45 rows=729 width=38) (actual time=9077.608..9077.609 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=1771862 read=246806 dirtied=1554 written=456 -> HashAggregate (cost=1727252.21..1727264.97 rows=729 width=38) (actual time=9077.542..9077.544 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1771859 read=246806 dirtied=1554 written=456 -> Hash Join (cost=39444.89..1726765.49 rows=24336 width=38) (actual time=1101.078..9038.494 rows=24504 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1771859 read=246806 dirtied=1554 written=456 -> Nested Loop (cost=39443.33..1726307.63 rows=24336 width=16) (actual time=1101.013..9003.683 rows=24504 loops=1) Buffers: shared hit=1771855 read=246806 dirtied=1554 written=456 -> Hash Join (cost=39443.03..1718455.32 rows=24336 width=16) (actual time=1100.994..8829.518 rows=24504 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1698193 read=246806 dirtied=1554 written=456 -> Nested Loop (cost=412.35..1678724.98 rows=121679 width=20) (actual time=7.864..7653.087 rows=121779 loops=1) Buffers: shared hit=1587074 read=211688 dirtied=1554 written=402 -> Nested Loop (cost=411.91..1481941.47 rows=401881 width=16) (actual time=7.760..3719.078 rows=401562 loops=1) Buffers: shared hit=286551 read=184304 dirtied=1445 written=360 -> Bitmap Heap Scan on part (cost=411.35..28055.26 rows=13280 width=4) (actual time=7.675..130.083 rows=13366 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD BURNISHED NICKEL'::text) Heap Blocks: exact=11369 Buffers: shared hit=4574 read=6879 written=14 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..408.03 rows=13280 width=0) (actual time=5.288..5.288 rows=13366 loops=1) Index Cond: ((p_type)::text = 'STANDARD BURNISHED NICKEL'::text) Buffers: shared read=84 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.17 rows=31 width=20) (actual time=0.025..0.259 rows=30 loops=13366) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=281977 read=177425 dirtied=1445 written=346 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.009..0.009 rows=0 loops=401562) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1300523 read=27384 dirtied=109 written=42 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1088.022..1088.022 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=111119 read=35118 written=54 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=22.906..987.764 rows=300270 loops=1) Buffers: shared hit=111119 read=35118 written=54 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.063..0.092 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..0.011 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=0.017..0.018 rows=1 loops=1) Filter: (r_name = 'ASIA'::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=20.183..186.125 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=111117 read=35118 written=54 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.989..12.989 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=830 written=3 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=24504) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73662 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.020..0.020 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..0.005 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.273 ms Execution time: 9078.783 ms (66 rows) COMMIT; COMMIT