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 = 'PROMO ANODIZED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2161728.24..2161730.07 rows=732 width=38) (actual time=65531.397..65531.398 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=728448 read=271768 dirtied=993 written=153 -> HashAggregate (cost=2161680.60..2161693.41 rows=732 width=38) (actual time=65531.311..65531.312 rows=2 loops=1) Buffers: shared hit=728445 read=271768 dirtied=993 written=153 -> Nested Loop (cost=498216.82..2161195.84 rows=24238 width=38) (actual time=39265.268..65417.027 rows=24108 loops=1) Buffers: shared hit=728445 read=271768 dirtied=993 written=153 -> Nested Loop (cost=498216.82..2154283.17 rows=24238 width=16) (actual time=39265.214..64226.738 rows=24108 loops=1) Buffers: shared hit=680229 read=271768 dirtied=993 written=153 -> Hash Join (cost=498216.82..2147223.83 rows=24242 width=16) (actual time=39265.173..62871.982 rows=24108 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=607752 read=271768 dirtied=993 written=153 -> Nested Loop (cost=0.00..1646770.20 rows=398878 width=16) (actual time=0.597..22075.039 rows=397550 loops=1) Buffers: shared hit=230357 read=235501 dirtied=771 written=153 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46003.18 rows=13220 width=4) (actual time=0.392..692.916 rows=13249 loops=1) Index Cond: (p_type = 'PROMO ANODIZED BRASS'::text) Heap Fetches: 13249 Buffers: shared hit=2928 read=8481 written=4 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.78 rows=31 width=20) (actual time=0.166..1.594 rows=30 loops=13249) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=227429 read=227020 dirtied=771 written=149 -> Hash (cost=486753.14..486753.14 rows=917094 width=8) (actual time=39262.556..39262.556 rows=913326 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35677kB Buffers: shared hit=377392 read=36267 dirtied=222 -> Hash Join (cost=136817.62..486753.14 rows=917094 width=8) (actual time=10066.455..36478.612 rows=913326 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=377392 read=36267 dirtied=222 -> Bitmap Heap Scan on orders (cost=97787.00..421356.06 rows=4585471 width=12) (actual time=4612.616..16789.196 rows=4561664 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=246493 read=20928 dirtied=222 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..96640.63 rows=4585471 width=0) (actual time=4488.143..4488.143 rows=4584480 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=4270 read=8364 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=5453.628..5453.628 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=130899 read=15339 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=54.359..5190.824 rows=300270 loops=1) Buffers: shared hit=130899 read=15339 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.051..0.116 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=0.007..0.024 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.026..0.026 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=0.022..0.023 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=51.110..1016.108 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=130897 read=15339 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=39.713..39.713 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.052..0.053 rows=1 loops=24108) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72477 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.044..0.045 rows=1 loops=24108) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48216 Total runtime: 65548.146 ms (64 rows) COMMIT; COMMIT