BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'RUSSIA' 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 BRUSHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2174658.96..2174660.78 rows=729 width=38) (actual time=31383.418..31383.419 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=723199 read=273310 dirtied=621 written=17 -> HashAggregate (cost=2174611.54..2174624.30 rows=729 width=38) (actual time=31383.335..31383.336 rows=2 loops=1) Buffers: shared hit=723196 read=273310 dirtied=621 written=17 -> Nested Loop (cost=495359.14..2174125.24 rows=24315 width=38) (actual time=25044.006..31326.060 rows=24107 loops=1) Buffers: shared hit=723196 read=273310 dirtied=621 written=17 -> Nested Loop (cost=495359.14..2167190.60 rows=24315 width=16) (actual time=25043.936..31184.159 rows=24107 loops=1) Buffers: shared hit=674982 read=273310 dirtied=621 written=17 -> Hash Join (cost=495359.14..2160100.68 rows=24347 width=16) (actual time=25043.891..30895.358 rows=24107 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=602524 read=273310 dirtied=621 written=17 -> Nested Loop (cost=0.00..1662486.59 rows=402295 width=16) (actual time=0.537..4869.005 rows=396285 loops=1) Buffers: shared hit=284230 read=178940 dirtied=368 written=13 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46462.35 rows=13373 width=4) (actual time=0.421..207.666 rows=13197 loops=1) Index Cond: (p_type = 'LARGE BRUSHED TIN'::text) Heap Fetches: 13197 Buffers: shared read=11340 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.53 rows=31 width=20) (actual time=0.036..0.340 rows=30 loops=13197) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=284230 read=167600 dirtied=368 written=13 -> Hash (cost=483977.75..483977.75 rows=910511 width=8) (actual time=25042.250..25042.250 rows=913977 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35703kB Buffers: shared hit=318291 read=94370 dirtied=253 written=4 -> Hash Join (cost=135484.22..483977.75 rows=910511 width=8) (actual time=5674.506..22712.373 rows=913977 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=318291 read=94370 dirtied=253 written=4 -> Bitmap Heap Scan on orders (cost=96453.59..418769.93 rows=4552556 width=12) (actual time=3646.661..8147.830 rows=4561956 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=208220 read=58264 dirtied=253 written=4 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95315.46 rows=4552556 width=0) (actual time=3473.003..3473.003 rows=4570988 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12456 written=4 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2027.536..2027.536 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=110071 read=36106 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=35.819..1822.341 rows=300963 loops=1) Buffers: shared hit=110071 read=36106 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.053..0.121 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=0.011..0.027 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.020..0.020 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=0.017..0.018 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=36.391..343.873 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=110069 read=36106 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=25.372..25.372 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=833 -> 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=24107) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72458 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.004 rows=1 loops=24107) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48214 Total runtime: 31394.707 ms (64 rows) COMMIT; COMMIT