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 = 'MEDIUM ANODIZED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1720980.40..1720982.22 rows=728 width=38) (actual time=9572.889..9572.889 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=1823393 read=439220 -> HashAggregate (cost=1720933.05..1720945.79 rows=728 width=38) (actual time=9572.839..9572.841 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1823390 read=439220 -> Hash Join (cost=39449.10..1720449.53 rows=24176 width=38) (actual time=648.029..9537.337 rows=24111 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1823390 read=439220 -> Nested Loop (cost=39447.53..1719994.67 rows=24176 width=16) (actual time=647.965..9506.290 rows=24111 loops=1) Buffers: shared hit=1823386 read=439220 -> Hash Join (cost=39447.24..1712193.96 rows=24176 width=16) (actual time=647.932..9353.889 rows=24111 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1750912 read=439220 -> Nested Loop (cost=416.55..1672468.23 rows=120878 width=20) (actual time=6.008..8640.363 rows=119939 loops=1) Buffers: shared hit=1605505 read=438390 -> Nested Loop (cost=416.12..1476754.40 rows=399710 width=16) (actual time=5.951..3611.408 rows=394880 loops=1) Buffers: shared hit=264298 read=197934 -> Bitmap Heap Scan on part (cost=411.40..28063.46 rows=13287 width=4) (actual time=5.886..56.397 rows=13196 loops=1) Recheck Cond: ((p_type)::text = 'MEDIUM ANODIZED COPPER'::text) Heap Blocks: exact=11355 Buffers: shared hit=11355 read=83 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..408.08 rows=13287 width=0) (actual time=3.901..3.901 rows=13196 loops=1) Index Cond: ((p_type)::text = 'MEDIUM ANODIZED COPPER'::text) Buffers: shared read=83 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.036..0.259 rows=30 loops=13196) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=395998 Buffers: shared hit=252943 read=197851 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.021..0.021 rows=30 loops=13196) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=38078 read=16718 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=394880) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1341207 read=240456 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=638.695..638.695 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=145407 read=830 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=16.793..560.187 rows=300270 loops=1) Buffers: shared hit=145407 read=830 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.027..0.071 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..0.017 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.010..0.010 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.007 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=15.425..102.591 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=145405 read=830 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=9.895..9.895 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=830 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=24111) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72474 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.022..0.022 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.004..0.006 rows=25 loops=1) Buffers: shared hit=1 Planning time: 10.714 ms Execution time: 9573.848 ms (72 rows) COMMIT; COMMIT