BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'FRANCE' 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 = 'EUROPE' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'LARGE ANODIZED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2197839.40..2197841.22 rows=729 width=38) (actual time=25725.087..25725.088 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=845494 read=160504 dirtied=626 written=8241 -> HashAggregate (cost=2197791.98..2197804.74 rows=729 width=38) (actual time=25725.005..25725.007 rows=2 loops=1) Buffers: shared hit=845491 read=160504 dirtied=626 written=8241 -> Nested Loop (cost=494549.32..2197298.42 rows=24678 width=38) (actual time=19993.478..25667.538 rows=24548 loops=1) Buffers: shared hit=845491 read=160504 dirtied=626 written=8241 -> Nested Loop (cost=494549.32..2190260.26 rows=24678 width=16) (actual time=19993.404..25525.926 rows=24548 loops=1) Buffers: shared hit=796395 read=160504 dirtied=626 written=8241 -> Hash Join (cost=494549.32..2183064.62 rows=24710 width=16) (actual time=19993.348..25235.130 rows=24548 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=722619 read=160504 dirtied=626 written=8241 -> Nested Loop (cost=0.00..1686226.66 rows=408307 width=16) (actual time=0.417..4295.125 rows=402865 loops=1) Buffers: shared hit=361229 read=109736 dirtied=626 written=6000 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47138.31 rows=13600 width=4) (actual time=0.327..218.766 rows=13407 loops=1) Index Cond: (p_type = 'LARGE ANODIZED TIN'::text) Heap Fetches: 13407 Buffers: shared hit=1945 read=9603 written=566 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.21 rows=31 width=20) (actual time=0.036..0.290 rows=30 loops=13407) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=359284 read=100133 dirtied=626 written=5434 -> Hash (cost=483190.61..483190.61 rows=908697 width=8) (actual time=19991.824..19991.824 rows=913072 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35667kB Buffers: shared hit=361387 read=50768 written=2241 -> Hash Join (cost=135391.26..483190.61 rows=908697 width=8) (actual time=4312.534..19456.145 rows=913072 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=361387 read=50768 written=2241 -> Bitmap Heap Scan on orders (cost=96360.64..418034.94 rows=4543487 width=12) (actual time=2585.244..6585.568 rows=4557440 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=225974 read=40004 written=2241 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95224.77 rows=4543487 width=0) (actual time=2438.581..2438.581 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=3076 read=9380 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1726.988..1726.988 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=135413 read=10764 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=26.763..1529.846 rows=300963 loops=1) Buffers: shared hit=135413 read=10764 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.041..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..0.020 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.019..0.019 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=0.015..0.016 rows=1 loops=1) Filter: (r_name = 'EUROPE'::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=30.555..284.746 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=135411 read=10764 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=20.234..20.234 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=603 read=236 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.010..0.010 rows=1 loops=24548) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73776 -> 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=24548) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49096 Total runtime: 25734.384 ms (64 rows) COMMIT; COMMIT