BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'INDONESIA' 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 = 'PROMO ANODIZED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2160823.98..2160825.81 rows=733 width=38) (actual time=26591.219..26591.220 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=640348 read=358098 dirtied=1258 written=27 -> HashAggregate (cost=2160776.27..2160789.10 rows=733 width=38) (actual time=26591.129..26591.130 rows=2 loops=1) Buffers: shared hit=640345 read=358098 dirtied=1258 written=27 -> Nested Loop (cost=497000.39..2160291.77 rows=24225 width=38) (actual time=20851.332..26541.675 rows=24081 loops=1) Buffers: shared hit=640345 read=358098 dirtied=1258 written=27 -> Nested Loop (cost=497000.39..2153382.80 rows=24225 width=16) (actual time=20851.248..26430.603 rows=24081 loops=1) Buffers: shared hit=592183 read=358098 dirtied=1258 written=27 -> Hash Join (cost=497000.39..2146320.55 rows=24252 width=16) (actual time=20851.205..26189.283 rows=24081 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=519799 read=358098 dirtied=1258 written=27 -> Nested Loop (cost=0.00..1647086.12 rows=398302 width=16) (actual time=0.438..4218.012 rows=397390 loops=1) Buffers: shared hit=279103 read=185815 dirtied=751 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46027.25 rows=13227 width=4) (actual time=0.356..178.174 rows=13236 loops=1) Index Cond: (p_type = 'PROMO ANODIZED STEEL'::text) Heap Fetches: 13236 Buffers: shared hit=179 read=11229 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.73 rows=31 width=20) (actual time=0.030..0.294 rows=30 loops=13236) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=278924 read=174586 dirtied=751 -> Hash (cost=485538.09..485538.09 rows=916984 width=8) (actual time=20849.603..20849.603 rows=913295 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35676kB Buffers: shared hit=240693 read=172283 dirtied=507 written=27 -> Hash Join (cost=136119.97..485538.09 rows=916984 width=8) (actual time=4457.836..20405.684 rows=913295 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=240693 read=172283 dirtied=507 written=27 -> Bitmap Heap Scan on orders (cost=97089.35..420144.18 rows=4584922 width=12) (actual time=3145.611..7104.273 rows=4561773 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=130561 read=136177 dirtied=507 written=27 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95943.12 rows=4584922 width=0) (actual time=3006.571..3006.571 rows=4575464 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12457 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1311.620..1311.620 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=110132 read=36106 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=31.792..1185.507 rows=300270 loops=1) Buffers: shared hit=110132 read=36106 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.041..0.100 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..0.020 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.017..0.017 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=0.013..0.014 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=23.714..224.464 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=110130 read=36106 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=16.008..16.008 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=0.008..0.009 rows=1 loops=24081) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72384 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.002..0.003 rows=1 loops=24081) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48162 Total runtime: 26604.018 ms (64 rows) COMMIT; COMMIT