BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'VIETNAM' 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 = 'ASIA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'LARGE POLISHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1717094.79..1717096.60 rows=727 width=38) (actual time=10735.690..10735.691 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=1784964 read=242948 dirtied=1882 written=867 -> HashAggregate (cost=1717047.51..1717060.23 rows=727 width=38) (actual time=10735.629..10735.631 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1784961 read=242948 dirtied=1882 written=867 -> Hash Join (cost=39440.17..1716565.21 rows=24115 width=38) (actual time=1144.966..10694.465 rows=24781 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1784961 read=242948 dirtied=1882 written=867 -> Nested Loop (cost=39438.60..1716111.49 rows=24115 width=16) (actual time=1144.902..10655.330 rows=24781 loops=1) Buffers: shared hit=1784957 read=242948 dirtied=1882 written=867 -> Hash Join (cost=39438.31..1708330.49 rows=24115 width=16) (actual time=1144.875..10436.144 rows=24781 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1710496 read=242948 dirtied=1882 written=867 -> Nested Loop (cost=407.63..1668606.50 rows=120576 width=20) (actual time=7.677..9160.629 rows=122827 loops=1) Buffers: shared hit=1600056 read=207151 dirtied=1882 written=705 -> Nested Loop (cost=407.19..1473200.40 rows=399068 width=16) (actual time=7.617..4362.711 rows=403277 loops=1) Buffers: shared hit=297997 read=175171 dirtied=1760 written=576 -> Bitmap Heap Scan on part (cost=406.63..27937.90 rows=13187 width=4) (actual time=7.519..180.808 rows=13451 loops=1) Recheck Cond: ((p_type)::text = 'LARGE POLISHED NICKEL'::text) Heap Blocks: exact=11468 Buffers: shared hit=1747 read=9805 written=40 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..403.33 rows=13187 width=0) (actual time=5.131..5.131 rows=13451 loops=1) Index Cond: ((p_type)::text = 'LARGE POLISHED NICKEL'::text) Buffers: shared read=84 written=2 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.29 rows=31 width=20) (actual time=0.029..0.300 rows=30 loops=13451) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=296250 read=165366 dirtied=1760 written=536 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.011 rows=0 loops=403277) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1302059 read=31980 dirtied=122 written=129 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1134.717..1134.717 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=110440 read=35797 written=162 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.933..1040.030 rows=300270 loops=1) Buffers: shared hit=110440 read=35797 written=162 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.055..0.084 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..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.019..0.019 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=0.013..0.014 rows=1 loops=1) Filter: (r_name = 'ASIA'::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=19.311..196.543 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=110438 read=35797 written=162 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.499..12.499 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=830 written=3 -> 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=24781) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74461 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.027..0.027 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..0.010 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.796 ms Execution time: 10736.906 ms (66 rows) COMMIT; COMMIT