BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'UNITED STATES' 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 = 'STANDARD ANODIZED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1764437.45..1764439.27 rows=727 width=38) (actual time=11328.481..11328.481 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=1692336 read=303588 dirtied=2196 written=10359 -> HashAggregate (cost=1764390.18..1764402.90 rows=727 width=38) (actual time=11328.418..11328.420 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1692333 read=303588 dirtied=2196 written=10359 -> Hash Join (cost=39444.73..1763903.28 rows=24345 width=38) (actual time=1242.518..11291.126 rows=23805 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1692333 read=303588 dirtied=2196 written=10359 -> Nested Loop (cost=39443.17..1763445.25 rows=24345 width=16) (actual time=1242.453..11257.072 rows=23805 loops=1) Buffers: shared hit=1692329 read=303588 dirtied=2196 written=10359 -> Hash Join (cost=39442.88..1755590.05 rows=24345 width=16) (actual time=1242.430..11053.471 rows=23805 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1620802 read=303588 dirtied=2196 written=10359 -> Nested Loop (cost=412.19..1715859.44 rows=121727 width=20) (actual time=7.528..9728.722 rows=120444 loops=1) Buffers: shared hit=1510965 read=267488 dirtied=2196 written=10359 -> Nested Loop (cost=411.76..1518584.10 rows=402877 width=16) (actual time=7.326..4681.220 rows=396769 loops=1) Buffers: shared hit=246193 read=220143 dirtied=2196 written=8500 -> Bitmap Heap Scan on part (cost=411.19..28030.66 rows=13260 width=4) (actual time=7.247..192.215 rows=13234 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD ANODIZED STEEL'::text) Heap Blocks: exact=11271 Buffers: shared hit=2 read=11351 written=443 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..407.88 rows=13260 width=0) (actual time=5.035..5.035 rows=13234 loops=1) Index Cond: ((p_type)::text = 'STANDARD ANODIZED STEEL'::text) Buffers: shared read=82 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..112.09 rows=32 width=20) (actual time=0.030..0.328 rows=30 loops=13234) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=246191 read=208792 dirtied=2196 written=8057 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=396769) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1264772 read=47345 written=1859 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1230.583..1230.583 rows=299436 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14624kB Buffers: shared hit=109837 read=36100 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=22.063..1111.696 rows=299436 loops=1) Buffers: shared hit=109837 read=36100 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.065..0.095 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=0.008..0.018 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.023..0.023 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=0.017..0.018 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=19.506..211.156 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145102 Buffers: shared hit=109835 read=36100 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.542..12.542 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=826 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=23805) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71527 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.023..0.023 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..0.008 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.930 ms Execution time: 11329.268 ms (66 rows) COMMIT; COMMIT