BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'GERMANY' 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 = 'EUROPE' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'STANDARD PLATED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1723820.89..1723822.71 rows=727 width=38) (actual time=14983.005..14983.006 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=1719970 read=316992 written=5623 -> HashAggregate (cost=1723773.62..1723786.34 rows=727 width=38) (actual time=14982.947..14982.947 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1719967 read=316992 written=5623 -> Hash Join (cost=39449.30..1723290.56 rows=24153 width=38) (actual time=1781.688..14932.261 rows=24613 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1719967 read=316992 written=5623 -> Nested Loop (cost=39447.73..1722836.12 rows=24153 width=16) (actual time=1781.623..14883.215 rows=24613 loops=1) Buffers: shared hit=1719963 read=316992 written=5623 -> Hash Join (cost=39447.44..1715042.83 rows=24153 width=16) (actual time=1781.574..14638.136 rows=24613 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1646219 read=316750 written=5620 -> Nested Loop (cost=416.76..1675317.75 rows=120765 width=20) (actual time=16.300..12726.937 rows=123557 loops=1) Buffers: shared hit=1513071 read=303722 written=5620 -> Nested Loop (cost=416.32..1479613.48 rows=399695 width=16) (actual time=16.125..6143.797 rows=405813 loops=1) Buffers: shared hit=259536 read=214785 written=4100 -> Bitmap Heap Scan on part (cost=411.60..28094.59 rows=13313 width=4) (actual time=15.992..90.509 rows=13533 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD PLATED BRASS'::text) Heap Blocks: exact=11578 Buffers: shared hit=11381 read=281 written=1 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..408.27 rows=13313 width=0) (actual time=12.558..12.558 rows=13533 loops=1) Index Cond: ((p_type)::text = 'STANDARD PLATED BRASS'::text) Buffers: shared read=84 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.042..0.433 rows=30 loops=13533) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=406351 Buffers: shared hit=248155 read=214504 written=4099 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.030..0.030 rows=30 loops=13533) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=43193 read=13115 written=270 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.015..0.015 rows=0 loops=405813) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1253535 read=88937 written=1520 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1757.069..1757.069 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=133148 read=13028 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=45.474..1597.530 rows=300963 loops=1) Buffers: shared hit=133148 read=13028 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.099..0.161 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=0.013..0.027 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.034..0.034 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=0.026..0.027 rows=1 loops=1) Filter: (r_name = 'EUROPE'::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=30.433..303.502 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=133146 read=13028 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=21.307..21.307 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=832 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.009 rows=1 loops=24613) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73744 read=242 written=3 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.020..0.020 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=0.003..0.006 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.858 ms Execution time: 14984.050 ms (70 rows) COMMIT; COMMIT