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 = 34 and p_type like '%STEEL' 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=803564.77..803564.78 rows=1 width=190) (actual time=18134.681..18134.714 rows=100 loops=1) Buffers: shared hit=1276421 read=601557 written=182 -> Sort (cost=803564.77..803564.78 rows=1 width=190) (actual time=18134.679..18134.696 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=1276421 read=601557 written=182 -> Merge Join (cost=381650.08..803564.76 rows=1 width=190) (actual time=14883.428..18127.040 rows=4679 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1698 Buffers: shared hit=1276413 read=601557 written=182 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7969 width=30) (actual time=0.385..1314.867 rows=7941 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 34)) Rows Removed by Filter: 1992059 Buffers: shared hit=757 read=45984 -> Sort (cost=381649.66..385649.66 rows=1600000 width=168) (actual time=14882.151..15560.527 rows=1604048 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1123174 read=547679 written=182 -> Nested Loop (cost=2.00..216772.53 rows=1600000 width=168) (actual time=0.090..11468.996 rows=1604080 loops=1) Buffers: shared hit=1123174 read=547679 written=182 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.073..163.970 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=0.009..0.012 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=0.060..141.709 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=0.010..49.584 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.027..0.027 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..0.013 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=0.023..0.532 rows=80 loops=20051) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1120993 read=547679 written=182 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.073..0.073 rows=1 loops=6377) Buffers: shared hit=152482 read=7894 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.048..0.071 rows=2 loops=6377) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=152482 read=7894 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6377) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6377 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.034..0.066 rows=4 loops=6377) Buffers: shared hit=146105 read=7894 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.031..0.056 rows=4 loops=6377) Buffers: shared hit=95089 read=7894 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.023..0.025 rows=4 loops=6377) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=18409 read=7894 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=25508) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76680 -> 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=25508) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51016 Planning time: 9.375 ms Execution time: 18198.380 ms (68 rows) COMMIT; COMMIT