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 = 17 and p_type like '%COPPER' 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=807375.30..807375.31 rows=1 width=190) (actual time=8839.316..8839.338 rows=100 loops=1) Buffers: shared hit=1634472 read=242781 written=118 -> Sort (cost=807375.30..807375.31 rows=1 width=190) (actual time=8839.313..8839.324 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=1634472 read=242781 written=118 -> Merge Join (cost=381649.99..807375.29 rows=1 width=190) (actual time=6559.786..8834.447 rows=4671 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1678 Buffers: shared hit=1634464 read=242781 written=118 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8066 width=30) (actual time=0.132..1153.610 rows=7945 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 17)) Rows Removed by Filter: 1992055 Buffers: shared hit=756 read=45985 written=14 -> Sort (cost=381649.56..385649.56 rows=1600000 width=168) (actual time=6558.867..6880.167 rows=1604012 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1478400 read=192453 written=104 -> Nested Loop (cost=2.00..216772.44 rows=1600000 width=168) (actual time=0.058..4730.489 rows=1604080 loops=1) Buffers: shared hit=1478400 read=192453 written=104 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.048..98.359 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=0.006..0.009 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=0.039..83.873 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=0.007..33.576 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.017..0.017 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=0.005..0.011 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..0.212 rows=80 loops=20051) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1476219 read=192453 written=104 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.055..0.055 rows=1 loops=6349) Buffers: shared hit=155308 read=4343 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.035..0.053 rows=2 loops=6349) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155308 read=4343 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=6349) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6349 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.023..0.049 rows=4 loops=6349) Buffers: shared hit=148959 read=4343 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.021..0.041 rows=4 loops=6349) Buffers: shared hit=98167 read=4343 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.014..0.016 rows=4 loops=6349) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21858 read=4343 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=25396) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76309 -> Index Scan using pk_nation on nation nation_1 (cost=0.14..0.16 rows=1 width=8) (actual time=0.001..0.001 rows=1 loops=25396) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50792 Planning time: 5.339 ms Execution time: 8883.524 ms (68 rows) COMMIT; COMMIT