BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'EGYPT' 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 = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'STANDARD POLISHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1752365.31..1752367.15 rows=733 width=38) (actual time=9785.721..9785.721 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=1737526 read=242123 dirtied=174 written=18510 -> HashAggregate (cost=1752317.60..1752330.43 rows=733 width=38) (actual time=9785.665..9785.665 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1737523 read=242123 dirtied=174 written=18510 -> Hash Join (cost=39455.00..1751821.06 rows=24827 width=38) (actual time=1067.453..9747.755 rows=24052 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1737523 read=242123 dirtied=174 written=18510 -> Nested Loop (cost=39453.44..1751354.00 rows=24827 width=16) (actual time=1067.382..9712.996 rows=24052 loops=1) Buffers: shared hit=1737519 read=242123 dirtied=174 written=18510 -> Hash Join (cost=39453.15..1743343.24 rows=24827 width=16) (actual time=1067.362..9518.856 rows=24052 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1665220 read=242123 dirtied=174 written=18510 -> Nested Loop (cost=422.46..1703598.77 rows=124137 width=20) (actual time=6.875..8350.640 rows=119225 loops=1) Buffers: shared hit=1555169 read=206019 dirtied=174 written=18510 -> Nested Loop (cost=422.02..1503857.62 rows=407931 width=16) (actual time=6.703..4185.545 rows=393209 loops=1) Buffers: shared hit=282863 read=178143 dirtied=174 written=16120 -> Bitmap Heap Scan on part (cost=417.31..28362.42 rows=13533 width=4) (actual time=6.644..128.669 rows=13115 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD POLISHED TIN'::text) Heap Blocks: exact=11148 Buffers: shared hit=4592 read=6638 written=476 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.93 rows=13533 width=0) (actual time=4.619..4.619 rows=13115 loops=1) Index Cond: ((p_type)::text = 'STANDARD POLISHED TIN'::text) Buffers: shared read=82 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.039..0.298 rows=30 loops=13115) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=395323 Buffers: shared hit=278271 read=171505 dirtied=174 written=15644 -> 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=13115) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=41677 read=12776 written=1072 -> 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=393209) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1272306 read=27876 written=2390 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1055.809..1055.809 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=110051 read=36104 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=18.604..944.832 rows=299838 loops=1) Buffers: shared hit=110051 read=36104 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.041..0.082 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=0.006..0.012 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 = 'MIDDLE EAST'::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=17.359..177.988 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=110049 read=36104 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=11.362..11.362 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=24052) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72299 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.021..0.021 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=0.003..0.006 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.607 ms Execution time: 9786.647 ms (70 rows) COMMIT; COMMIT