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 = 'ECONOMY POLISHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1738920.73..1738922.56 rows=729 width=38) (actual time=10368.181..10368.181 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=1931346 read=335576 dirtied=51 written=234 -> HashAggregate (cost=1738873.31..1738886.07 rows=729 width=38) (actual time=10368.116..10368.118 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1931343 read=335576 dirtied=51 written=234 -> Hash Join (cost=39454.07..1738379.95 rows=24668 width=38) (actual time=1039.715..10328.704 rows=23987 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1931343 read=335576 dirtied=51 written=234 -> Nested Loop (cost=39452.51..1737915.87 rows=24668 width=16) (actual time=1039.656..10295.187 rows=23987 loops=1) Buffers: shared hit=1931339 read=335576 dirtied=51 written=234 -> Hash Join (cost=39452.22..1729956.45 rows=24668 width=16) (actual time=1039.639..10126.540 rows=23987 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1859256 read=335574 dirtied=51 written=234 -> Nested Loop (cost=421.53..1690216.57 rows=123338 width=20) (actual time=7.461..9010.347 rows=120430 loops=1) Buffers: shared hit=1749186 read=299468 dirtied=51 written=192 -> Nested Loop (cost=421.10..1490664.78 rows=407526 width=16) (actual time=7.237..3762.253 rows=395432 loops=1) Buffers: shared hit=283405 read=181382 dirtied=51 written=116 -> Bitmap Heap Scan on part (cost=416.38..28219.43 rows=13413 width=4) (actual time=7.126..158.881 rows=13188 loops=1) Recheck Cond: ((p_type)::text = 'ECONOMY POLISHED BRASS'::text) Heap Blocks: exact=11350 Buffers: shared read=11432 written=6 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.02 rows=13413 width=0) (actual time=4.880..4.880 rows=13188 loops=1) Index Cond: ((p_type)::text = 'ECONOMY POLISHED BRASS'::text) Buffers: shared read=82 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.037..0.263 rows=30 loops=13188) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=398585 Buffers: shared hit=283405 read=169950 dirtied=51 written=110 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.023..0.023 rows=30 loops=13188) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=38397 read=16373 written=6 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.013..0.013 rows=0 loops=395432) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1465781 read=118086 written=76 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1027.713..1027.713 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=110070 read=36106 written=42 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.601..918.714 rows=300963 loops=1) Buffers: shared hit=110070 read=36106 written=42 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.052..0.083 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..0.012 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: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.013..0.014 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=19.019..172.692 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=110068 read=36106 written=42 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.288..12.288 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=832 written=1 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=23987) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72083 read=2 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.019..0.019 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.003..0.006 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.467 ms Execution time: 10369.081 ms (72 rows) COMMIT; COMMIT