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 = 'PROMO PLATED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1680543.74..1680545.56 rows=729 width=38) (actual time=10545.905..10545.906 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=2042874 read=236658 dirtied=732 written=54 -> HashAggregate (cost=1680496.32..1680509.08 rows=729 width=38) (actual time=10545.850..10545.851 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=2042871 read=236658 dirtied=732 written=54 -> Hash Join (cost=39433.73..1680027.04 rows=23464 width=38) (actual time=777.505..10504.064 rows=24283 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=2042871 read=236658 dirtied=732 written=54 -> Nested Loop (cost=39432.17..1679585.53 rows=23464 width=16) (actual time=777.456..10467.808 rows=24283 loops=1) Buffers: shared hit=2042867 read=236658 dirtied=732 written=54 -> Hash Join (cost=39431.88..1672014.56 rows=23464 width=16) (actual time=777.434..10280.542 rows=24283 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1969901 read=236658 dirtied=732 written=54 -> Nested Loop (cost=401.19..1632309.29 rows=117320 width=20) (actual time=6.425..9414.470 rows=120950 loops=1) Buffers: shared hit=1824559 read=235824 dirtied=732 written=54 -> Nested Loop (cost=400.76..1442503.85 rows=387641 width=16) (actual time=6.318..3949.226 rows=398130 loops=1) Buffers: shared hit=280671 read=184950 dirtied=544 written=39 -> Bitmap Heap Scan on part (cost=400.19..27547.39 rows=12873 width=4) (actual time=6.250..180.851 rows=13247 loops=1) Recheck Cond: ((p_type)::text = 'PROMO PLATED NICKEL'::text) Heap Blocks: exact=11322 Buffers: shared hit=197 read=11194 written=2 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..396.98 rows=12873 width=0) (actual time=4.137..4.137 rows=13247 loops=1) Index Cond: ((p_type)::text = 'PROMO PLATED NICKEL'::text) Buffers: shared read=69 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.61 rows=31 width=20) (actual time=0.027..0.274 rows=30 loops=13247) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=280474 read=173756 dirtied=544 written=37 -> 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=398130) 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=1543888 read=50874 dirtied=188 written=15 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=768.455..768.455 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=145342 read=834 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=23.420..678.441 rows=300963 loops=1) Buffers: shared hit=145342 read=834 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.039..0.070 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=0.007..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.015..0.015 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=0.010..0.011 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=20.640..125.073 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=145340 read=834 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=13.670..13.670 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=831 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=24283) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72966 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.017..0.017 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=0.004..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.024 ms Execution time: 10547.092 ms (68 rows) COMMIT; COMMIT