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 = 3 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=803701.11..803701.11 rows=1 width=190) (actual time=12001.186..12001.210 rows=100 loops=1) Buffers: shared hit=1509131 read=369309 written=14300 -> Sort (cost=803701.11..803701.11 rows=1 width=190) (actual time=12001.183..12001.195 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=1509131 read=369309 written=14300 -> Merge Join (cost=381593.57..803701.10 rows=1 width=190) (actual time=9396.089..11995.509 rows=4740 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1712 Buffers: shared hit=1509123 read=369309 written=14300 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7976 width=30) (actual time=0.928..1023.610 rows=8005 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 3)) Rows Removed by Filter: 1991995 Buffers: shared hit=40103 read=6638 written=50 -> Sort (cost=381593.06..385591.78 rows=1599488 width=168) (actual time=9393.816..9950.915 rows=1602485 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1311020 read=358406 written=14229 -> Nested Loop (cost=2.00..216772.39 rows=1599488 width=168) (actual time=0.105..7036.252 rows=1602640 loops=1) Buffers: shared hit=1311020 read=358406 written=14229 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.065..111.281 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=0.009..0.012 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=0.046..95.234 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..33.501 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.019..0.019 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=0.004..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=0.017..0.323 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1308839 read=358406 written=14229 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.056..0.056 rows=1 loops=6452) Buffers: shared hit=158000 read=4265 written=21 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.036..0.054 rows=2 loops=6452) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=158000 read=4265 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=6452) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6452 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.023..0.050 rows=4 loops=6452) Buffers: shared hit=151548 read=4265 written=21 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.021..0.040 rows=4 loops=6452) Buffers: shared hit=99932 read=4265 written=21 -> 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=6452) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22391 read=4265 written=21 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=25808) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77541 -> 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=25808) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51616 Planning time: 6.131 ms Execution time: 12056.628 ms (68 rows) COMMIT; COMMIT