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 = 32 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=801608.55..801608.56 rows=1 width=190) (actual time=11661.948..11661.978 rows=100 loops=1) Buffers: shared hit=1528824 read=355795 written=1234 -> Sort (cost=801608.55..801608.56 rows=1 width=190) (actual time=11661.945..11661.964 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=1528824 read=355795 written=1234 -> Merge Join (cost=381554.45..801608.54 rows=1 width=190) (actual time=9061.388..11655.986 rows=4885 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1808 Buffers: shared hit=1528816 read=355795 written=1234 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7963 width=30) (actual time=0.021..1236.092 rows=8082 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 32)) Rows Removed by Filter: 1991918 Buffers: shared hit=2657 read=44084 written=95 -> Sort (cost=381554.03..385551.87 rows=1599136 width=168) (actual time=9060.984..9460.033 rows=1602380 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1363310 read=306116 written=1118 -> Nested Loop (cost=2.00..216772.17 rows=1599136 width=168) (actual time=0.094..6567.289 rows=1602640 loops=1) Buffers: shared hit=1363310 read=306116 written=1118 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.056..109.780 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=0.005..0.010 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=0.041..93.735 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..36.366 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=0.003..0.006 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..0.301 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1361129 read=306116 written=1118 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.061..0.061 rows=1 loops=6693) Buffers: shared hit=162849 read=5595 written=21 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.039..0.059 rows=2 loops=6693) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=162849 read=5595 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=6693) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6693 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.026..0.055 rows=4 loops=6693) Buffers: shared hit=156156 read=5595 written=21 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.024..0.046 rows=4 loops=6693) Buffers: shared hit=102612 read=5595 written=21 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.016..0.018 rows=4 loops=6693) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22142 read=5595 written=21 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=26772) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=80470 -> 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=26772) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=53544 Planning time: 5.739 ms Execution time: 11701.044 ms (68 rows) COMMIT; COMMIT