BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'ARGENTINA' 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 = 'AMERICA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'ECONOMY PLATED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2213605.37..2213607.19 rows=731 width=38) (actual time=31334.655..31334.656 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=732270 read=284259 dirtied=774 written=11 -> HashAggregate (cost=2213557.80..2213570.59 rows=731 width=38) (actual time=31334.564..31334.566 rows=2 loops=1) Buffers: shared hit=732267 read=284259 dirtied=774 written=11 -> Nested Loop (cost=496097.55..2213056.14 rows=25083 width=38) (actual time=22530.930..31262.983 rows=24801 loops=1) Buffers: shared hit=732267 read=284259 dirtied=774 written=11 -> Nested Loop (cost=496097.55..2205902.47 rows=25083 width=16) (actual time=22530.861..31058.029 rows=24801 loops=1) Buffers: shared hit=682665 read=284259 dirtied=774 written=11 -> Hash Join (cost=496097.55..2198598.22 rows=25083 width=16) (actual time=22530.827..30670.251 rows=24801 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=608138 read=284259 dirtied=774 written=11 -> Nested Loop (cost=0.00..1700185.11 rows=412946 width=16) (actual time=0.528..6786.531 rows=410517 loops=1) Buffers: shared hit=262158 read=217814 dirtied=521 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47516.20 rows=13727 width=4) (actual time=0.426..267.688 rows=13689 loops=1) Index Cond: (p_type = 'ECONOMY PLATED STEEL'::text) Heap Fetches: 13689 Buffers: shared hit=497 read=11266 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.09 rows=31 width=20) (actual time=0.047..0.460 rows=30 loops=13689) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=261661 read=206548 dirtied=521 -> Hash (cost=484674.49..484674.49 rows=913845 width=8) (actual time=22529.071..22529.071 rows=911247 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35596kB Buffers: shared hit=345977 read=66445 dirtied=253 written=11 -> Hash Join (cost=135835.07..484674.49 rows=913845 width=8) (actual time=4958.890..21376.600 rows=911247 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=345977 read=66445 dirtied=253 written=11 -> Bitmap Heap Scan on orders (cost=96804.45..419370.83 rows=4569225 width=12) (actual time=2899.918..7591.450 rows=4561956 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=236140 read=30344 dirtied=253 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95662.15 rows=4569225 width=0) (actual time=2793.827..2793.827 rows=4570988 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12456 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2058.430..2058.430 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=109837 read=36101 written=11 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=34.784..1879.270 rows=299436 loops=1) Buffers: shared hit=109837 read=36101 written=11 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.044..0.086 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..0.019 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 = 'AMERICA'::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=32.384..356.368 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=109835 read=36101 written=11 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=22.144..22.144 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=827 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.013..0.013 rows=1 loops=24801) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74527 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.005..0.005 rows=1 loops=24801) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49602 Total runtime: 31361.034 ms (64 rows) COMMIT; COMMIT