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 = 'PROMO POLISHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1773088.73..1773090.56 rows=729 width=38) (actual time=7298.944..7298.944 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=1836904 read=214477 -> HashAggregate (cost=1773041.31..1773054.07 rows=729 width=38) (actual time=7298.881..7298.883 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1836901 read=214477 -> Hash Join (cost=39460.40..1772542.47 rows=24942 width=38) (actual time=687.455..7264.880 rows=25049 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1836901 read=214477 -> Nested Loop (cost=39458.84..1772073.25 rows=24942 width=16) (actual time=687.379..7233.026 rows=25049 loops=1) Buffers: shared hit=1836897 read=214477 -> Hash Join (cost=39458.54..1764019.24 rows=24961 width=16) (actual time=687.328..7056.093 rows=25049 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1764048 read=212029 -> Nested Loop (cost=427.86..1724270.92 rows=124807 width=20) (actual time=7.754..6314.589 rows=124092 loops=1) Buffers: shared hit=1618641 read=211199 -> Nested Loop (cost=427.42..1522394.25 rows=412301 width=16) (actual time=7.693..3258.706 rows=409042 loops=1) Buffers: shared hit=315833 read=161373 -> Bitmap Heap Scan on part (cost=426.86..28607.47 rows=13733 width=4) (actual time=7.633..160.354 rows=13596 loops=1) Recheck Cond: ((p_type)::text = 'PROMO POLISHED BRASS'::text) Heap Blocks: exact=11590 Buffers: shared hit=8 read=11667 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..423.43 rows=13733 width=0) (actual time=5.238..5.238 rows=13596 loops=1) Index Cond: ((p_type)::text = 'PROMO POLISHED BRASS'::text) Buffers: shared read=85 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.46 rows=31 width=20) (actual time=0.023..0.219 rows=30 loops=13596) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=315825 read=149706 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.007..0.007 rows=0 loops=409042) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1302808 read=49826 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=674.519..674.519 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=145407 read=830 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=20.998..596.553 rows=300270 loops=1) Buffers: shared hit=145407 read=830 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.042..0.111 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=0.003..0.032 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=0.010..0.011 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=17.690..109.043 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=145405 read=830 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=11.747..11.747 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=0.006..0.006 rows=1 loops=25049) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72849 read=2448 -> 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=0.004..0.009 rows=25 loops=1) Buffers: shared hit=1 Planning time: 9.889 ms Execution time: 7299.666 ms (66 rows) COMMIT; COMMIT