BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'INDONESIA' 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 = 'ECONOMY ANODIZED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1796012.99..1796014.81 rows=727 width=38) (actual time=10418.441..10418.442 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=1845403 read=216734 dirtied=466 written=5 -> HashAggregate (cost=1795965.72..1795978.44 rows=727 width=38) (actual time=10418.377..10418.377 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1845400 read=216734 dirtied=466 written=5 -> Hash Join (cost=39465.95..1795458.66 rows=25353 width=38) (actual time=823.361..10376.744 rows=24888 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1845400 read=216734 dirtied=466 written=5 -> Nested Loop (cost=39464.39..1794981.73 rows=25353 width=16) (actual time=823.300..10340.026 rows=24888 loops=1) Buffers: shared hit=1845396 read=216734 dirtied=466 written=5 -> Hash Join (cost=39464.09..1786800.93 rows=25354 width=16) (actual time=823.276..10118.249 rows=24888 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1770583 read=216734 dirtied=466 written=5 -> Nested Loop (cost=433.41..1747041.32 rows=126768 width=20) (actual time=8.027..9206.135 rows=124806 loops=1) Buffers: shared hit=1625176 read=215904 dirtied=466 written=5 -> Nested Loop (cost=432.97..1541606.50 rows=419561 width=16) (actual time=7.662..4187.195 rows=411271 loops=1) Buffers: shared hit=311927 read=169114 dirtied=360 written=3 -> Bitmap Heap Scan on part (cost=432.41..28844.73 rows=13933 width=4) (actual time=7.549..197.633 rows=13678 loops=1) Recheck Cond: ((p_type)::text = 'ECONOMY ANODIZED COPPER'::text) Heap Blocks: exact=11655 Buffers: shared hit=96 read=11645 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..428.93 rows=13933 width=0) (actual time=5.241..5.241 rows=13678 loops=1) Index Cond: ((p_type)::text = 'ECONOMY ANODIZED COPPER'::text) Buffers: shared read=86 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.26 rows=31 width=20) (actual time=0.028..0.281 rows=30 loops=13678) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=311831 read=157469 dirtied=360 written=3 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.012 rows=0 loops=411271) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1313249 read=46790 dirtied=106 written=2 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=812.007..812.007 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=21.331..720.686 rows=300270 loops=1) Buffers: shared hit=145407 read=830 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.054..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=0.009..0.017 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.021..0.021 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 = '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=19.356..133.562 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=12.488..12.488 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=0.007..0.008 rows=1 loops=24888) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74813 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.019..0.019 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..0.006 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.394 ms Execution time: 10420.199 ms (66 rows) COMMIT; COMMIT