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 = 'STANDARD POLISHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2164949.88..2164951.71 rows=730 width=38) (actual time=24032.470..24032.470 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=744107 read=255311 dirtied=2654 written=76 -> HashAggregate (cost=2164902.39..2164915.17 rows=730 width=38) (actual time=24032.391..24032.392 rows=2 loops=1) Buffers: shared hit=744104 read=255311 dirtied=2654 written=76 -> Nested Loop (cost=502241.55..2164417.11 rows=24264 width=38) (actual time=18815.462..23991.406 rows=24019 loops=1) Buffers: shared hit=744104 read=255311 dirtied=2654 written=76 -> Nested Loop (cost=502241.55..2157497.02 rows=24264 width=16) (actual time=18815.381..23901.298 rows=24019 loops=1) Buffers: shared hit=696066 read=255311 dirtied=2654 written=76 -> Hash Join (cost=502241.55..2150423.73 rows=24290 width=16) (actual time=18815.330..23695.915 rows=24019 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=623882 read=255311 dirtied=2654 written=76 -> Nested Loop (cost=0.00..1645936.03 rows=400651 width=16) (actual time=0.361..3859.537 rows=393592 loops=1) Buffers: shared hit=271881 read=191585 dirtied=2654 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45947.49 rows=13200 width=4) (actual time=0.294..157.063 rows=13115 loops=1) Index Cond: (p_type = 'STANDARD POLISHED TIN'::text) Heap Fetches: 13115 Buffers: shared hit=4 read=11230 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.90 rows=31 width=20) (actual time=0.027..0.272 rows=30 loops=13115) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=271877 read=180355 dirtied=2654 -> Hash (cost=490737.52..490737.52 rows=920322 width=8) (actual time=18813.888..18813.888 rows=913268 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35675kB Buffers: shared hit=351998 read=63726 written=76 -> Hash Join (cost=138947.11..490737.52 rows=920322 width=8) (actual time=4554.005..18175.752 rows=913268 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=351998 read=63726 written=76 -> Bitmap Heap Scan on orders (cost=99916.49..425247.64 rows=4601610 width=12) (actual time=3191.001..6581.854 rows=4561761 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=241867 read=27619 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98766.09 rows=4601610 width=0) (actual time=3039.501..3039.501 rows=4612043 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13179 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1362.533..1362.533 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=110131 read=36107 written=76 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=31.739..1240.342 rows=300270 loops=1) Buffers: shared hit=110131 read=36107 written=76 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.034..0.065 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=0.015..0.015 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=0.011..0.013 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=22.246..232.463 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=110129 read=36107 written=76 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=14.835..14.835 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=0.007..0.007 rows=1 loops=24019) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72184 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.002..0.002 rows=1 loops=24019) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48038 Total runtime: 24044.836 ms (64 rows) COMMIT; COMMIT