BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'SAUDI ARABIA' 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 = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'LARGE ANODIZED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2148330.69..2148332.51 rows=728 width=38) (actual time=53520.252..53520.252 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=816737 read=197115 dirtied=659 written=34 -> HashAggregate (cost=2148283.34..2148296.08 rows=728 width=38) (actual time=53520.171..53520.172 rows=2 loops=1) Buffers: shared hit=816734 read=197115 dirtied=659 written=34 -> Nested Loop (cost=495478.00..2147805.72 rows=23881 width=38) (actual time=31360.605..53405.519 rows=24792 loops=1) Buffers: shared hit=816734 read=197115 dirtied=659 written=34 -> Nested Loop (cost=495478.00..2140994.86 rows=23881 width=16) (actual time=31360.534..52902.211 rows=24792 loops=1) Buffers: shared hit=767150 read=197115 dirtied=659 written=34 -> Hash Join (cost=495478.00..2134038.31 rows=23889 width=16) (actual time=31360.488..51490.516 rows=24792 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=692649 read=197115 dirtied=659 written=34 -> Nested Loop (cost=0.00..1636344.99 rows=395287 width=16) (actual time=0.436..18551.265 rows=407474 loops=1) Buffers: shared hit=296344 read=180523 dirtied=407 written=34 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45725.94 rows=13127 width=4) (actual time=0.347..746.266 rows=13589 loops=1) Index Cond: (p_type = 'LARGE ANODIZED COPPER'::text) Heap Fetches: 13589 Buffers: shared hit=2050 read=9681 written=2 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.86 rows=31 width=20) (actual time=0.160..1.291 rows=30 loops=13589) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=294294 read=170842 dirtied=407 written=32 -> Hash (cost=484101.25..484101.25 rows=910140 width=8) (actual time=31357.997..31357.997 rows=911525 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35607kB Buffers: shared hit=396302 read=16592 dirtied=252 -> Hash Join (cost=135393.20..484101.25 rows=910140 width=8) (actual time=6681.395..30479.104 rows=911525 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=396302 read=16592 dirtied=252 -> Bitmap Heap Scan on orders (cost=96362.58..418904.10 rows=4550701 width=12) (actual time=3795.073..12561.719 rows=4561773 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=253781 read=12957 dirtied=252 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95224.91 rows=4550701 width=0) (actual time=3671.736..3671.736 rows=4575464 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=6537 read=5920 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2885.953..2885.953 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=142521 read=3635 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=38.387..2653.750 rows=299838 loops=1) Buffers: shared hit=142521 read=3635 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.042..0.123 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..0.024 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.022..0.022 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=0.019..0.020 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::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=37.275..509.254 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=142519 read=3635 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=26.894..26.894 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=830 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.053..0.054 rows=1 loops=24792) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74501 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.015..0.016 rows=1 loops=24792) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49584 Total runtime: 53534.091 ms (64 rows) COMMIT; COMMIT