BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'INDIA' 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 = 'STANDARD BURNISHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2137630.75..2137632.58 rows=733 width=38) (actual time=21013.597..21013.598 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=767267 read=240281 dirtied=3187 -> HashAggregate (cost=2137583.04..2137595.87 rows=733 width=38) (actual time=21013.549..21013.550 rows=2 loops=1) Buffers: shared hit=767264 read=240281 dirtied=3187 -> Nested Loop (cost=502680.45..2137105.48 rows=23878 width=38) (actual time=15826.674..20973.189 rows=24201 loops=1) Buffers: shared hit=767264 read=240281 dirtied=3187 -> Nested Loop (cost=502680.45..2130295.47 rows=23878 width=16) (actual time=15826.625..20877.066 rows=24201 loops=1) Buffers: shared hit=718862 read=240281 dirtied=3187 -> Hash Join (cost=502680.45..2123334.58 rows=23904 width=16) (actual time=15826.585..20675.954 rows=24201 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=646125 read=240281 dirtied=3187 -> Nested Loop (cost=0.00..1618452.15 rows=392587 width=16) (actual time=0.304..3997.589 rows=399836 loops=1) Buffers: shared hit=245435 read=225511 dirtied=3187 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45182.37 rows=12947 width=4) (actual time=0.225..150.939 rows=13330 loops=1) Index Cond: (p_type = 'STANDARD BURNISHED BRASS'::text) Heap Fetches: 13330 Buffers: shared hit=1 read=11382 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..121.21 rows=31 width=20) (actual time=0.027..0.279 rows=30 loops=13330) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=245434 read=214129 dirtied=3187 -> Hash (cost=491138.23..491138.23 rows=923378 width=8) (actual time=15825.577..15825.577 rows=912317 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35638kB Buffers: shared hit=400687 read=14770 -> Hash Join (cost=139283.74..491138.23 rows=923378 width=8) (actual time=3261.159..15418.640 rows=912317 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=400687 read=14770 -> Bitmap Heap Scan on orders (cost=100253.12..425560.49 rows=4616891 width=12) (actual time=2425.621..5461.497 rows=4557203 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=255279 read=13940 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..99098.90 rows=4616891 width=0) (actual time=2323.124..2323.124 rows=4607485 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13165 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=835.107..835.107 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=145408 read=830 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=20.575..738.403 rows=300270 loops=1) Buffers: shared hit=145408 read=830 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.024..0.057 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=0.003..0.010 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.011..0.011 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=0.008..0.009 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=19.934..135.339 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145406 read=830 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.239..13.239 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=830 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=24201) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72737 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.002..0.002 rows=1 loops=24201) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48402 Total runtime: 21025.222 ms (64 rows) COMMIT; COMMIT