BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'JAPAN' 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 = 'SMALL ANODIZED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1730307.32..1730309.15 rows=733 width=38) (actual time=8550.144..8550.145 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=1772299 read=247835 dirtied=1937 written=208 -> HashAggregate (cost=1730259.61..1730272.44 rows=733 width=38) (actual time=8550.087..8550.087 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1772296 read=247835 dirtied=1937 written=208 -> Hash Join (cost=39445.10..1729769.43 rows=24509 width=38) (actual time=1017.330..8514.264 rows=24253 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1772296 read=247835 dirtied=1937 written=208 -> Nested Loop (cost=39443.53..1729308.32 rows=24509 width=16) (actual time=1017.259..8484.008 rows=24253 loops=1) Buffers: shared hit=1772292 read=247835 dirtied=1937 written=208 -> Hash Join (cost=39443.24..1721400.19 rows=24509 width=16) (actual time=1017.244..8320.259 rows=24253 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1699389 read=247835 dirtied=1937 written=208 -> Nested Loop (cost=412.56..1681664.87 rows=122545 width=20) (actual time=6.521..7237.774 rows=121997 loops=1) Buffers: shared hit=1589257 read=211730 dirtied=1937 written=152 -> Nested Loop (cost=412.12..1484480.84 rows=402699 width=16) (actual time=6.468..3587.353 rows=401927 loops=1) Buffers: shared hit=275216 read=196595 dirtied=1834 written=143 -> Bitmap Heap Scan on part (cost=411.56..28088.03 rows=13307 width=4) (actual time=6.405..161.127 rows=13380 loops=1) Recheck Cond: ((p_type)::text = 'SMALL ANODIZED TIN'::text) Heap Blocks: exact=11423 Buffers: shared hit=11 read=11481 written=9 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..408.23 rows=13307 width=0) (actual time=4.352..4.352 rows=13380 loops=1) Index Cond: ((p_type)::text = 'SMALL ANODIZED TIN'::text) Buffers: shared read=69 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.14 rows=31 width=20) (actual time=0.024..0.246 rows=30 loops=13380) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=275205 read=185114 dirtied=1834 written=134 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.008..0.008 rows=0 loops=401927) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1314041 read=15135 dirtied=103 written=9 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1006.468..1006.468 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=110132 read=36105 written=56 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=18.876..915.481 rows=300270 loops=1) Buffers: shared hit=110132 read=36105 written=56 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.053..0.088 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..0.013 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.029..0.029 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=0.022..0.023 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=16.960..172.675 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=110130 read=36105 written=56 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=11.043..11.043 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=830 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.005..0.006 rows=1 loops=24253) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72903 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.022..0.022 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..0.011 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.351 ms Execution time: 8551.171 ms (66 rows) COMMIT; COMMIT