BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select s_acctbal, s_name, n_name, p_partkey, p_mfgr, s_address, s_phone, s_comment from part, supplier, partsupp, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and p_size = 36 and p_type like '%STEEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'EUROPE' and ps_supplycost = ( select min(ps_supplycost) from partsupp, supplier, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'EUROPE' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=803906.74..803906.75 rows=1 width=190) (actual time=14329.034..14329.064 rows=100 loops=1) Buffers: shared hit=1344796 read=532548 written=312 -> Sort (cost=803906.74..803906.75 rows=1 width=190) (actual time=14329.031..14329.045 rows=100 loops=1) Sort Key: supplier.s_acctbal, nation.n_name, supplier.s_name, part.p_partkey Sort Method: top-N heapsort Memory: 51kB Buffers: shared hit=1344796 read=532548 written=312 -> Merge Join (cost=381650.08..803906.73 rows=1 width=190) (actual time=11450.089..14322.899 rows=4735 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1673 Buffers: shared hit=1344788 read=532548 written=312 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7977 width=30) (actual time=0.161..1350.738 rows=8018 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 36)) Rows Removed by Filter: 1991982 Buffers: shared hit=1894 read=44847 written=14 -> Sort (cost=381649.66..385649.66 rows=1600000 width=168) (actual time=11449.609..11832.001 rows=1601867 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1189260 read=480166 written=296 -> Nested Loop (cost=2.00..216772.53 rows=1600000 width=168) (actual time=0.167..9789.851 rows=1602640 loops=1) Buffers: shared hit=1189260 read=480166 written=296 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.089..124.379 rows=20033 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79967 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.010..0.013 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.069..107.123 rows=100000 loops=1) Hash Cond: (supplier.s_nationkey = nation.n_nationkey) Buffers: shared hit=2180 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.015..40.649 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.031..0.031 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.006..0.016 rows=25 loops=1) Buffers: shared hit=1 -> Index Scan using partsupp_ps_suppkey_idx on partsupp (cost=0.43..9.75 rows=80 width=12) (actual time=0.019..0.457 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1187079 read=480166 written=296 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.069..0.069 rows=1 loops=6408) Buffers: shared hit=153634 read=7535 written=2 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.046..0.067 rows=2 loops=6408) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=153634 read=7535 written=2 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6408) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6408 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.032..0.063 rows=4 loops=6408) Buffers: shared hit=147226 read=7535 written=2 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.029..0.053 rows=4 loops=6408) Buffers: shared hit=95963 read=7534 written=2 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.021..0.023 rows=4 loops=6408) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=18907 read=7534 written=2 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=25632) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77056 -> Index Scan using pk_nation on nation nation_1 (cost=0.14..0.16 rows=1 width=8) (actual time=0.001..0.002 rows=1 loops=25632) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51263 read=1 Planning time: 9.110 ms Execution time: 14349.369 ms (68 rows) COMMIT; COMMIT