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 = 'ECONOMY POLISHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2175863.90..2175865.73 rows=733 width=38) (actual time=39301.668..39301.669 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=721612 read=284785 dirtied=4003 written=7287 -> HashAggregate (cost=2175816.19..2175829.02 rows=733 width=38) (actual time=39301.576..39301.577 rows=2 loops=1) Buffers: shared hit=721609 read=284785 dirtied=4003 written=7287 -> Nested Loop (cost=503933.19..2175324.65 rows=24577 width=38) (actual time=30630.289..39229.336 rows=24043 loops=1) Buffers: shared hit=721609 read=284785 dirtied=4003 written=7287 -> Nested Loop (cost=503933.19..2168315.29 rows=24577 width=16) (actual time=30630.223..39003.763 rows=24043 loops=1) Buffers: shared hit=673523 read=284785 dirtied=4003 written=7287 -> Hash Join (cost=503933.19..2161158.43 rows=24577 width=16) (actual time=30630.195..38579.172 rows=24043 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=601248 read=284785 dirtied=4003 written=7287 -> Nested Loop (cost=0.00..1654960.08 rows=403878 width=16) (actual time=0.476..6921.665 rows=397730 loops=1) Buffers: shared hit=289610 read=180167 dirtied=4003 written=422 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46184.44 rows=13280 width=4) (actual time=0.392..294.201 rows=13259 loops=1) Index Cond: (p_type = 'ECONOMY POLISHED TIN'::text) Heap Fetches: 13259 Buffers: shared read=11366 written=25 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.83 rows=31 width=20) (actual time=0.052..0.484 rows=30 loops=13259) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=289610 read=168801 dirtied=4003 written=397 -> Hash (cost=492363.67..492363.67 rows=925562 width=8) (actual time=30627.816..30627.816 rows=912313 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35638kB Buffers: shared hit=311635 read=104618 written=6865 -> Hash Join (cost=139523.65..492363.67 rows=925562 width=8) (actual time=6883.801..29963.552 rows=912313 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=311635 read=104618 written=6865 -> Bitmap Heap Scan on orders (cost=100493.03..426723.15 rows=4627808 width=12) (actual time=4483.019..14057.035 rows=4557201 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=166228 read=103787 written=6865 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..99336.07 rows=4627808 width=0) (actual time=4282.403..4282.403 rows=4621215 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13202 written=2 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2400.073..2400.073 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=145407 read=831 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=33.582..2212.006 rows=300270 loops=1) Buffers: shared hit=145407 read=831 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.044..0.088 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=0.008..0.018 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: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.017..0.019 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=37.361..421.782 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145405 read=831 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=26.598..26.598 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.015..0.015 rows=1 loops=24043) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72275 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.006..0.006 rows=1 loops=24043) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48086 Total runtime: 39316.106 ms (64 rows) COMMIT; COMMIT