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 = 25 and p_type like '%BRASS' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AMERICA' 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 = 'AMERICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=806642.55..806642.55 rows=1 width=190) (actual time=7371.598..7371.624 rows=100 loops=1) Buffers: shared hit=1823893 read=53281 written=7 -> Sort (cost=806642.55..806642.55 rows=1 width=190) (actual time=7371.595..7371.609 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=1823893 read=53281 written=7 -> Merge Join (cost=381650.08..806642.54 rows=1 width=190) (actual time=5001.475..7366.369 rows=4697 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1647 Buffers: shared hit=1823885 read=53281 written=7 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8047 width=30) (actual time=0.067..1111.194 rows=8073 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 25)) Rows Removed by Filter: 1991927 Buffers: shared hit=22017 read=24724 written=1 -> Sort (cost=381649.66..385649.66 rows=1600000 width=168) (actual time=5000.994..5322.403 rows=1604002 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1646493 read=24360 written=6 -> Nested Loop (cost=2.00..216772.53 rows=1600000 width=168) (actual time=0.057..3677.815 rows=1604080 loops=1) Buffers: shared hit=1646493 read=24360 written=6 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.047..96.956 rows=20051 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79949 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.005..0.008 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.038..82.467 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=0.008..32.943 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.016..0.016 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=0.003..0.004 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=0.015..0.158 rows=80 loops=20051) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1644312 read=24360 written=6 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.056..0.056 rows=1 loops=6344) Buffers: shared hit=155375 read=4197 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.036..0.054 rows=2 loops=6344) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155375 read=4197 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=6344) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6344 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.024..0.051 rows=4 loops=6344) Buffers: shared hit=149031 read=4197 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.022..0.042 rows=4 loops=6344) Buffers: shared hit=98279 read=4197 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.015..0.016 rows=4 loops=6344) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22018 read=4197 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.005..0.006 rows=1 loops=25376) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76261 -> 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=25376) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50752 Planning time: 6.056 ms Execution time: 7389.853 ms (68 rows) COMMIT; COMMIT