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 = 'LARGE POLISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1741844.12..1741845.94 rows=729 width=38) (actual time=9689.536..9689.536 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=1806133 read=235369 dirtied=73 written=53 -> HashAggregate (cost=1741796.70..1741809.45 rows=729 width=38) (actual time=9689.473..9689.475 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1806130 read=235369 dirtied=73 written=53 -> Hash Join (cost=39454.38..1741306.56 rows=24507 width=38) (actual time=1013.532..9649.202 rows=25054 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1806130 read=235369 dirtied=73 written=53 -> Nested Loop (cost=39452.82..1740845.49 rows=24507 width=16) (actual time=1013.473..9612.870 rows=25054 loops=1) Buffers: shared hit=1806126 read=235369 dirtied=73 written=53 -> Hash Join (cost=39452.53..1732937.98 rows=24507 width=16) (actual time=1013.446..9431.690 rows=25054 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1730818 read=235369 dirtied=73 written=53 -> Nested Loop (cost=421.84..1693202.72 rows=122534 width=20) (actual time=7.610..8341.544 rows=123862 loops=1) Buffers: shared hit=1613727 read=206223 dirtied=73 written=53 -> Nested Loop (cost=421.41..1495043.18 rows=404705 width=16) (actual time=7.452..3958.870 rows=406568 loops=1) Buffers: shared hit=307572 read=167404 written=42 -> Bitmap Heap Scan on part (cost=416.69..28266.65 rows=13453 width=4) (actual time=7.344..140.882 rows=13512 loops=1) Recheck Cond: ((p_type)::text = 'LARGE POLISHED COPPER'::text) Heap Blocks: exact=11500 Buffers: shared hit=3699 read=7886 written=1 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.32 rows=13453 width=0) (actual time=4.985..4.985 rows=13512 loops=1) Index Cond: ((p_type)::text = 'LARGE POLISHED COPPER'::text) Buffers: shared read=85 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.037..0.272 rows=30 loops=13512) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=407338 Buffers: shared hit=303873 read=159518 written=41 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.025..0.025 rows=30 loops=13512) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=39785 read=16268 written=6 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.010..0.010 rows=0 loops=406568) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1306155 read=38819 dirtied=73 written=11 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1002.744..1002.744 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=117091 read=29146 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.207..908.270 rows=300270 loops=1) Buffers: shared hit=117091 read=29146 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.056..0.086 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..0.015 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=19.184..170.610 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=117089 read=29146 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.379..12.379 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=25054) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=75308 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.023..0.023 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: 8.029 ms Execution time: 9690.402 ms (70 rows) COMMIT; COMMIT