BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'IRAQ' 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 = 'PROMO BRUSHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1746538.83..1746540.66 rows=732 width=38) (actual time=12264.974..12264.975 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=1715672 read=288975 dirtied=106 written=522 -> HashAggregate (cost=1746491.19..1746504.00 rows=732 width=38) (actual time=12264.908..12264.909 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1715669 read=288975 dirtied=106 written=522 -> Hash Join (cost=39454.59..1745995.05 rows=24807 width=38) (actual time=1267.217..12220.760 rows=24111 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1715669 read=288975 dirtied=106 written=522 -> Nested Loop (cost=39453.03..1745528.35 rows=24807 width=16) (actual time=1267.150..12179.960 rows=24111 loops=1) Buffers: shared hit=1715665 read=288975 dirtied=106 written=522 -> Hash Join (cost=39452.73..1737524.07 rows=24807 width=16) (actual time=1267.132..11956.200 rows=24111 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1643208 read=288975 dirtied=106 written=522 -> Nested Loop (cost=422.05..1697780.19 rows=124034 width=20) (actual time=8.071..10610.598 rows=121413 loops=1) Buffers: shared hit=1532761 read=253267 dirtied=106 written=427 -> Nested Loop (cost=421.61..1498033.25 rows=407933 width=16) (actual time=7.911..5177.925 rows=398632 loops=1) Buffers: shared hit=260427 read=206838 dirtied=61 written=349 -> Bitmap Heap Scan on part (cost=416.90..28299.15 rows=13480 width=4) (actual time=7.764..172.647 rows=13257 loops=1) Recheck Cond: ((p_type)::text = 'PROMO BRUSHED BRASS'::text) Heap Blocks: exact=11331 Buffers: shared hit=3100 read=8300 written=15 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.53 rows=13480 width=0) (actual time=5.309..5.309 rows=13257 loops=1) Index Cond: ((p_type)::text = 'PROMO BRUSHED BRASS'::text) Buffers: shared read=69 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.048..0.366 rows=30 loops=13257) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=400816 Buffers: shared hit=257327 read=198538 dirtied=61 written=334 -> 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=13257) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=39155 read=15894 written=30 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.013..0.013 rows=0 loops=398632) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1272334 read=46429 dirtied=45 written=78 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1254.074..1254.074 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=110447 read=35708 written=95 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=23.552..1151.983 rows=299838 loops=1) Buffers: shared hit=110447 read=35708 written=95 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.058..0.090 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=0.020..0.020 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=0.015..0.016 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=20.933..217.734 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=110445 read=35708 written=95 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=13.587..13.587 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.008 rows=1 loops=24111) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72457 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.025..0.025 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..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 9.232 ms Execution time: 12265.864 ms (70 rows) COMMIT; COMMIT