BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'ROMANIA' 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 = 'EUROPE' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'LARGE BURNISHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1668355.81..1668357.63 rows=729 width=38) (actual time=11553.287..11553.287 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=1957153 read=323526 dirtied=441 -> HashAggregate (cost=1668308.39..1668321.14 rows=729 width=38) (actual time=11553.247..11553.249 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1957150 read=323526 dirtied=441 -> Hash Join (cost=38728.48..1667843.37 rows=23251 width=38) (actual time=2207.387..11513.521 rows=24135 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1957150 read=323526 dirtied=441 -> Nested Loop (cost=38726.91..1667405.85 rows=23251 width=16) (actual time=2207.338..11474.945 rows=24135 loops=1) Buffers: shared hit=1957146 read=323526 dirtied=441 -> Hash Join (cost=38726.62..1659891.35 rows=23289 width=16) (actual time=2207.289..11311.355 rows=24135 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1886288 read=321846 dirtied=441 -> Nested Loop (cost=396.47..1620891.63 rows=116446 width=20) (actual time=6.757..9043.396 rows=119819 loops=1) Buffers: shared hit=1744952 read=286784 dirtied=441 -> Nested Loop (cost=396.04..1432645.32 rows=384459 width=16) (actual time=6.657..3525.660 rows=392802 loops=1) Buffers: shared hit=317075 read=141267 dirtied=398 -> Bitmap Heap Scan on part (cost=395.47..27427.83 rows=12780 width=4) (actual time=6.610..165.809 rows=13075 loops=1) Recheck Cond: ((p_type)::text = 'LARGE BURNISHED TIN'::text) Heap Blocks: exact=11226 Buffers: shared hit=927 read=10366 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..392.28 rows=12780 width=0) (actual time=4.385..4.385 rows=13075 loops=1) Index Cond: ((p_type)::text = 'LARGE BURNISHED TIN'::text) Buffers: shared read=67 -> Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem (cost=0.56..109.64 rows=31 width=20) (actual time=0.025..0.247 rows=30 loops=13075) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=316148 read=130901 dirtied=398 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.013..0.013 rows=0 loops=392802) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1427877 read=145517 dirtied=43 -> Hash (cost=34580.15..34580.15 rows=300000 width=4) (actual time=2197.516..2197.516 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=141336 read=35062 -> Nested Loop (cost=766.08..34580.15 rows=300000 width=4) (actual time=3.738..2104.364 rows=300963 loops=1) Buffers: shared hit=141336 read=35062 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.031..0.053 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=0.005..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.013..0.013 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=0.008..0.009 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=765.00..6315.54 rows=60000 width=8) (actual time=3.625..410.934 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Rows Removed by Index Recheck: 1439807 Heap Blocks: lossy=176390 Buffers: shared hit=141334 read=35062 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=3.592..3.592 rows=353280 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=4 read=2 -> 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=24135) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=70858 read=1680 -> 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=0.004..0.010 rows=25 loops=1) Buffers: shared hit=1 Planning time: 6.873 ms Execution time: 11553.908 ms (69 rows) COMMIT; COMMIT