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 = 'PROMO ANODIZED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2105669.62..2105671.44 rows=730 width=38) (actual time=26250.326..26250.327 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=825061 read=174859 dirtied=674 written=9070 -> HashAggregate (cost=2105622.12..2105634.90 rows=730 width=38) (actual time=26250.262..26250.263 rows=2 loops=1) Buffers: shared hit=825058 read=174859 dirtied=674 written=9070 -> Nested Loop (cost=494909.45..2105158.58 rows=23177 width=38) (actual time=20724.120..26197.616 rows=24367 loops=1) Buffers: shared hit=825058 read=174859 dirtied=674 written=9070 -> Nested Loop (cost=494909.45..2098548.50 rows=23177 width=16) (actual time=20724.039..26057.784 rows=24367 loops=1) Buffers: shared hit=776324 read=174859 dirtied=674 written=9070 -> Hash Join (cost=494909.45..2091792.00 rows=23202 width=16) (actual time=20723.996..25773.597 rows=24367 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=704386 read=173562 dirtied=674 written=9068 -> Nested Loop (cost=0.00..1594737.04 rows=382698 width=16) (actual time=0.368..3819.594 rows=398603 loops=1) Buffers: shared hit=376922 read=89107 dirtied=674 written=5519 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..44579.57 rows=12747 width=4) (actual time=0.300..200.011 rows=13278 loops=1) Index Cond: (p_type = 'PROMO ANODIZED NICKEL'::text) Heap Fetches: 13278 Buffers: shared hit=1530 read=9942 written=656 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..121.30 rows=31 width=20) (actual time=0.033..0.260 rows=30 loops=13278) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=375392 read=79165 dirtied=674 written=4863 -> Hash (cost=483530.43..483530.43 rows=910322 width=8) (actual time=20722.408..20722.408 rows=910325 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35560kB Buffers: shared hit=327461 read=84455 written=3549 -> Hash Join (cost=135562.52..483530.43 rows=910322 width=8) (actual time=4687.201..20267.506 rows=910325 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=327461 read=84455 written=3549 -> Bitmap Heap Scan on orders (cost=96531.90..418328.05 rows=4551610 width=12) (actual time=2228.311..6008.963 rows=4557440 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=192621 read=73357 written=3549 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95394.00 rows=4551610 width=0) (actual time=2093.129..2093.129 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=5753 read=6703 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2458.197..2458.197 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10528kB Buffers: shared hit=134840 read=11098 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=28.604..1347.028 rows=299436 loops=1) Buffers: shared hit=134840 read=11098 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.021..0.070 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=0.003..0.012 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.009..0.009 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=0.007..0.008 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=23.140..253.554 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=134838 read=11098 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=14.791..14.791 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=611 read=223 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.010..0.010 rows=1 loops=24367) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71938 read=1297 written=2 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.004 rows=1 loops=24367) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48734 Total runtime: 26268.698 ms (64 rows) COMMIT; COMMIT