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 = 'STANDARD PLATED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1682368.57..1682370.40 rows=732 width=38) (actual time=10246.953..10246.954 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=1790125 read=212942 dirtied=1546 written=230 -> HashAggregate (cost=1682320.93..1682333.74 rows=732 width=38) (actual time=10246.891..10246.893 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1790122 read=212942 dirtied=1546 written=230 -> Hash Join (cost=39433.69..1681846.89 rows=23702 width=38) (actual time=992.862..10207.348 rows=24193 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1790122 read=212942 dirtied=1546 written=230 -> Nested Loop (cost=39432.12..1681400.92 rows=23702 width=16) (actual time=992.801..10172.009 rows=24193 loops=1) Buffers: shared hit=1790118 read=212942 dirtied=1546 written=230 -> Hash Join (cost=39431.83..1673753.18 rows=23702 width=16) (actual time=992.780..9965.242 rows=24193 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1717363 read=212942 dirtied=1546 written=230 -> Nested Loop (cost=401.15..1634041.06 rows=118511 width=20) (actual time=7.566..8902.072 rows=120825 loops=1) Buffers: shared hit=1572019 read=212110 dirtied=1546 written=230 -> Nested Loop (cost=400.71..1443187.21 rows=389769 width=16) (actual time=7.511..4475.908 rows=398275 loops=1) Buffers: shared hit=270493 read=196571 dirtied=1479 written=217 -> Bitmap Heap Scan on part (cost=400.15..27540.70 rows=12867 width=4) (actual time=7.440..196.644 rows=13251 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD PLATED STEEL'::text) Heap Blocks: exact=11323 Buffers: shared hit=123 read=11283 written=10 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..396.93 rows=12867 width=0) (actual time=5.130..5.130 rows=13251 loops=1) Index Cond: ((p_type)::text = 'STANDARD PLATED STEEL'::text) Buffers: shared read=83 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.71 rows=31 width=20) (actual time=0.029..0.312 rows=30 loops=13251) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=270370 read=185288 dirtied=1479 written=207 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.010..0.010 rows=0 loops=398275) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1301526 read=15539 dirtied=67 written=13 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=884.934..884.934 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=145344 read=832 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=26.211..791.473 rows=300963 loops=1) Buffers: shared hit=145344 read=832 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.084..0.117 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=0.011..0.017 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.026..0.026 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=0.018..0.019 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=21.080..146.857 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=145342 read=832 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=13.782..13.782 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=832 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.008 rows=1 loops=24193) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72755 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.021..0.021 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: 7.999 ms Execution time: 10247.669 ms (66 rows) COMMIT; COMMIT