BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'INDONESIA' 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 PLATED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2160531.04..2160532.87 rows=730 width=38) (actual time=29156.631..29156.631 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=621268 read=387638 dirtied=1083 written=111 -> HashAggregate (cost=2160483.55..2160496.33 rows=730 width=38) (actual time=29156.567..29156.568 rows=2 loops=1) Buffers: shared hit=621265 read=387638 dirtied=1083 written=111 -> Nested Loop (cost=496124.92..2160000.89 rows=24133 width=38) (actual time=22749.238..29098.754 rows=24785 loops=1) Buffers: shared hit=621265 read=387638 dirtied=1083 written=111 -> Nested Loop (cost=496124.92..2153118.16 rows=24133 width=16) (actual time=22749.169..28958.877 rows=24785 loops=1) Buffers: shared hit=571695 read=387638 dirtied=1083 written=111 -> Hash Join (cost=496124.92..2146082.99 rows=24159 width=16) (actual time=22749.129..28675.954 rows=24785 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=497206 read=387638 dirtied=1083 written=111 -> Nested Loop (cost=0.00..1647724.09 rows=398478 width=16) (actual time=0.306..4727.825 rows=403330 loops=1) Buffers: shared hit=290120 read=181745 dirtied=635 written=44 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46044.07 rows=13233 width=4) (actual time=0.238..197.183 rows=13449 loops=1) Index Cond: (p_type = 'PROMO PLATED TIN'::text) Heap Fetches: 13449 Buffers: shared hit=301 read=11260 written=3 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.73 rows=31 width=20) (actual time=0.034..0.324 rows=30 loops=13449) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=289819 read=170485 dirtied=635 written=41 -> Hash (cost=484711.83..484711.83 rows=913047 width=8) (actual time=22748.057..22748.057 rows=913295 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35676kB Buffers: shared hit=207083 read=205893 dirtied=448 written=67 -> Hash Join (cost=135702.19..484711.83 rows=913047 width=8) (actual time=4305.327..22217.202 rows=913295 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=207083 read=205893 dirtied=448 written=67 -> Bitmap Heap Scan on orders (cost=96671.56..419431.10 rows=4565236 width=12) (actual time=3086.623..8010.676 rows=4561773 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=61676 read=205062 dirtied=448 written=67 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95530.26 rows=4565236 width=0) (actual time=2946.460..2946.460 rows=4575464 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12457 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1217.782..1217.782 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=145407 read=831 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=23.652..1026.300 rows=300270 loops=1) Buffers: shared hit=145407 read=831 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.028..0.077 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..0.017 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.013..0.013 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=0.010..0.011 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=28.354..188.070 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145405 read=831 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=19.252..19.252 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=0.009..0.010 rows=1 loops=24785) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74489 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.003 rows=1 loops=24785) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49570 Total runtime: 29171.887 ms (64 rows) COMMIT; COMMIT