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 = 'ECONOMY BRUSHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2262258.36..2262260.18 rows=729 width=38) (actual time=28911.264..28911.264 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=787584 read=233108 dirtied=2874 written=114 -> HashAggregate (cost=2262210.94..2262223.70 rows=729 width=38) (actual time=28911.173..28911.174 rows=2 loops=1) Buffers: shared hit=787581 read=233108 dirtied=2874 written=114 -> Nested Loop (cost=500471.77..2261694.16 rows=25839 width=38) (actual time=21440.651..28845.281 rows=24661 loops=1) Buffers: shared hit=787581 read=233108 dirtied=2874 written=114 -> Nested Loop (cost=500471.77..2254324.88 rows=25839 width=16) (actual time=21440.565..28688.618 rows=24661 loops=1) Buffers: shared hit=738259 read=233108 dirtied=2874 written=114 -> Hash Join (cost=500471.77..2246790.60 rows=25873 width=16) (actual time=21440.511..28362.524 rows=24661 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=664128 read=233108 dirtied=2874 written=114 -> Nested Loop (cost=0.00..1743922.56 rows=427509 width=16) (actual time=0.565..5771.415 rows=410464 loops=1) Buffers: shared hit=276987 read=205389 dirtied=2369 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..48699.52 rows=14127 width=4) (actual time=0.471..235.667 rows=13700 loops=1) Index Cond: (p_type = 'ECONOMY BRUSHED COPPER'::text) Heap Fetches: 13700 Buffers: shared hit=5 read=11768 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..119.69 rows=31 width=20) (actual time=0.039..0.389 rows=30 loops=13700) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=276982 read=193621 dirtied=2369 -> Hash (cost=489022.28..489022.28 rows=915959 width=8) (actual time=21438.606..21438.606 rows=913776 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35695kB Buffers: shared hit=387138 read=27719 dirtied=505 written=114 -> Hash Join (cost=138443.51..489022.28 rows=915959 width=8) (actual time=4946.734..20787.772 rows=913776 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=387138 read=27719 dirtied=505 written=114 -> Bitmap Heap Scan on orders (cost=99412.89..423657.83 rows=4579796 width=12) (actual time=3565.401..7813.347 rows=4561632 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=248391 read=20289 dirtied=505 written=114 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98267.94 rows=4579796 width=0) (actual time=3405.394..3405.394 rows=4598186 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=164 read=12968 written=112 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1380.904..1380.904 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=138747 read=7430 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=34.351..1195.172 rows=300963 loops=1) Buffers: shared hit=138747 read=7430 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.043..0.118 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..0.028 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.018..0.018 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=31.557..219.999 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=138745 read=7430 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=21.730..21.730 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=0.011..0.011 rows=1 loops=24661) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74131 -> 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=24661) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49322 Total runtime: 28924.761 ms (64 rows) COMMIT; COMMIT