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 = 'LARGE BURNISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1703118.90..1703120.73 rows=730 width=38) (actual time=12290.315..12290.315 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=1926779 read=369140 dirtied=1261 written=184 -> HashAggregate (cost=1703071.41..1703084.19 rows=730 width=38) (actual time=12290.255..12290.256 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1926776 read=369140 dirtied=1261 written=184 -> Hash Join (cost=39439.24..1702593.59 rows=23891 width=38) (actual time=1147.475..12250.523 rows=24393 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1926776 read=369140 dirtied=1261 written=184 -> Nested Loop (cost=39437.67..1702144.07 rows=23891 width=16) (actual time=1147.395..12214.670 rows=24393 loops=1) Buffers: shared hit=1926772 read=369140 dirtied=1261 written=184 -> Hash Join (cost=39437.38..1694427.28 rows=23916 width=16) (actual time=1147.349..12008.846 rows=24393 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1853451 read=369140 dirtied=1261 written=184 -> Nested Loop (cost=406.70..1654709.01 rows=119579 width=20) (actual time=7.973..10788.293 rows=122166 loops=1) Buffers: shared hit=1743319 read=333035 dirtied=1261 written=179 -> Nested Loop (cost=406.26..1461466.91 rows=394653 width=16) (actual time=7.766..4145.695 rows=401051 loops=1) Buffers: shared hit=266102 read=203879 dirtied=1261 written=124 -> Bitmap Heap Scan on part (cost=405.70..27790.94 rows=13067 width=4) (actual time=7.656..142.712 rows=13317 loops=1) Recheck Cond: ((p_type)::text = 'LARGE BURNISHED COPPER'::text) Heap Blocks: exact=11393 Buffers: shared hit=3698 read=7778 written=6 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..402.43 rows=13067 width=0) (actual time=5.342..5.342 rows=13317 loops=1) Index Cond: ((p_type)::text = 'LARGE BURNISHED COPPER'::text) Buffers: shared read=83 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.41 rows=31 width=20) (actual time=0.029..0.290 rows=30 loops=13317) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=262404 read=196101 dirtied=1261 written=118 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.016..0.016 rows=0 loops=401051) 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=1477217 read=129156 written=55 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1136.118..1136.118 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=110132 read=36105 written=5 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=22.428..1037.962 rows=300270 loops=1) Buffers: shared hit=110132 read=36105 written=5 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.051..0.080 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..0.014 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.024..0.024 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=0.014..0.015 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=19.656..196.229 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=110130 read=36105 written=5 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.869..12.869 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=830 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=24393) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73321 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.024..0.024 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: 8.156 ms Execution time: 12291.388 ms (68 rows) COMMIT; COMMIT