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 = 16 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=814947.61..814947.62 rows=1 width=190) (actual time=8682.629..8682.654 rows=100 loops=1) Buffers: shared hit=1688523 read=190414 written=2259 -> Sort (cost=814947.61..814947.62 rows=1 width=190) (actual time=8682.626..8682.641 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=1688523 read=190414 written=2259 -> Merge Join (cost=381649.99..814947.60 rows=1 width=190) (actual time=6015.038..8676.902 rows=4765 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1652 Buffers: shared hit=1688515 read=190414 written=2259 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8260 width=30) (actual time=0.063..1182.865 rows=8065 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 16)) Rows Removed by Filter: 1991935 Buffers: shared hit=758 read=45983 written=132 -> Sort (cost=381649.56..385649.56 rows=1600000 width=168) (actual time=6014.704..6526.164 rows=1603734 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1530806 read=140047 written=2106 -> Nested Loop (cost=2.00..216772.44 rows=1600000 width=168) (actual time=0.062..4458.836 rows=1604080 loops=1) Buffers: shared hit=1530806 read=140047 written=2106 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.051..100.493 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..86.165 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..34.721 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=0.002..0.007 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=0.014..0.199 rows=80 loops=20051) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1528625 read=140047 written=2106 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.057..0.057 rows=1 loops=6417) Buffers: shared hit=156951 read=4384 written=21 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.036..0.055 rows=2 loops=6417) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=156951 read=4384 written=21 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=6417) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6417 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.024..0.052 rows=4 loops=6417) Buffers: shared hit=150534 read=4384 written=21 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.022..0.043 rows=4 loops=6417) Buffers: shared hit=99198 read=4384 written=21 -> 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=6417) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22081 read=4384 written=21 -> 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=25668) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77117 -> 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=25668) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51336 Planning time: 5.217 ms Execution time: 8738.334 ms (68 rows) COMMIT; COMMIT