BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'MOROCCO' 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 = 'AFRICA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'STANDARD BRUSHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1726201.83..1726203.65 rows=727 width=38) (actual time=10457.175..10457.175 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=1791375 read=204604 dirtied=91 written=8 -> HashAggregate (cost=1726154.55..1726167.27 rows=727 width=38) (actual time=10457.115..10457.117 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1791372 read=204604 dirtied=91 written=8 -> Hash Join (cost=39449.40..1725669.55 rows=24250 width=38) (actual time=838.830..10414.727 rows=24222 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1791372 read=204604 dirtied=91 written=8 -> Nested Loop (cost=39447.84..1725213.30 rows=24250 width=16) (actual time=838.767..10376.372 rows=24222 loops=1) Buffers: shared hit=1791368 read=204604 dirtied=91 written=8 -> Hash Join (cost=39447.55..1717388.40 rows=24251 width=16) (actual time=838.741..10159.088 rows=24222 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1718553 read=204604 dirtied=91 written=8 -> Nested Loop (cost=416.86..1677660.50 rows=121254 width=20) (actual time=8.263..9231.594 rows=120795 loops=1) Buffers: shared hit=1573229 read=203780 dirtied=91 written=8 -> Nested Loop (cost=416.43..1481161.16 rows=401312 width=16) (actual time=7.962..4325.028 rows=396874 loops=1) Buffers: shared hit=305260 read=158973 written=5 -> Bitmap Heap Scan on part (cost=411.71..28110.96 rows=13327 width=4) (actual time=7.849..158.913 rows=13225 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD BRUSHED BRASS'::text) Heap Blocks: exact=11294 Buffers: shared hit=3327 read=8050 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..408.38 rows=13327 width=0) (actual time=5.484..5.484 rows=13225 loops=1) Index Cond: ((p_type)::text = 'STANDARD BRUSHED BRASS'::text) Buffers: shared hit=1 read=82 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.040..0.303 rows=30 loops=13225) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=397988 Buffers: shared hit=301933 read=150923 written=5 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.026..0.026 rows=30 loops=13225) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=41078 read=13790 -> 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=396874) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1267969 read=44807 dirtied=91 written=3 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=826.081..826.081 rows=299493 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14626kB Buffers: shared hit=145324 read=824 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=22.641..733.853 rows=299493 loops=1) Buffers: shared hit=145324 read=824 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.068..0.103 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=0.007..0.017 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.033..0.033 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..0.028 rows=1 loops=1) Filter: (r_name = 'AFRICA'::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=19.552..136.143 rows=59899 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145314 Buffers: shared hit=145322 read=824 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.629..12.629 rows=59899 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=8 read=824 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.008 rows=1 loops=24222) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72815 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.024..0.024 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..0.008 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.008 ms Execution time: 10458.824 ms (70 rows) COMMIT; COMMIT