BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'JORDAN' 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 = 'SMALL BURNISHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1717115.52..1717117.34 rows=730 width=38) (actual time=11843.874..11843.874 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=2008521 read=297059 dirtied=1823 written=1027 -> HashAggregate (cost=1717068.02..1717080.80 rows=730 width=38) (actual time=11843.809..11843.809 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=2008518 read=297059 dirtied=1823 written=1027 -> Hash Join (cost=39440.17..1716584.86 rows=24158 width=38) (actual time=1117.380..11803.107 rows=24391 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=2008518 read=297059 dirtied=1823 written=1027 -> Nested Loop (cost=39438.60..1716130.34 rows=24158 width=16) (actual time=1117.314..11764.712 rows=24391 loops=1) Buffers: shared hit=2008514 read=297059 dirtied=1823 written=1027 -> Hash Join (cost=39438.31..1708327.40 rows=24183 width=16) (actual time=1117.297..11555.334 rows=24391 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1935197 read=297059 dirtied=1823 written=1027 -> Nested Loop (cost=407.63..1668601.45 rows=120915 width=20) (actual time=7.763..10332.014 rows=122263 loops=1) Buffers: shared hit=1825146 read=260955 dirtied=1823 written=498 -> Nested Loop (cost=407.19..1473197.25 rows=399064 width=16) (actual time=7.523..4053.911 rows=402843 loops=1) Buffers: shared hit=288728 read=183796 dirtied=1525 written=355 -> Bitmap Heap Scan on part (cost=406.63..27937.90 rows=13187 width=4) (actual time=7.448..187.516 rows=13399 loops=1) Recheck Cond: ((p_type)::text = 'SMALL BURNISHED BRASS'::text) Heap Blocks: exact=11468 Buffers: shared hit=129 read=11423 written=25 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..403.33 rows=13187 width=0) (actual time=5.207..5.207 rows=13399 loops=1) Index Cond: ((p_type)::text = 'SMALL BURNISHED BRASS'::text) Buffers: shared read=84 written=1 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.29 rows=31 width=20) (actual time=0.028..0.278 rows=30 loops=13399) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=288599 read=172373 dirtied=1525 written=330 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.015..0.015 rows=0 loops=402843) 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=1536418 read=77159 dirtied=298 written=143 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1105.082..1105.082 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=110051 read=36104 written=529 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.178..1002.553 rows=299838 loops=1) Buffers: shared hit=110051 read=36104 written=529 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.039..0.068 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..0.013 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.015..0.015 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=0.009..0.010 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=905.11..6455.64 rows=60000 width=8) (actual time=18.226..189.415 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=110049 read=36104 written=529 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=11.877..11.877 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 written=2 -> 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=24391) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73317 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.032..0.032 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=0.005..0.010 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.844 ms Execution time: 11844.905 ms (68 rows) COMMIT; COMMIT