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 = 42 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=804981.52..804981.53 rows=1 width=190) (actual time=6767.536..6767.556 rows=100 loops=1) Buffers: shared hit=1678564 read=199015 -> Sort (cost=804981.52..804981.53 rows=1 width=190) (actual time=6767.533..6767.544 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=1678564 read=199015 -> Merge Join (cost=381650.08..804981.51 rows=1 width=190) (actual time=4779.617..6763.145 rows=4761 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1599 Buffers: shared hit=1678556 read=199015 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8005 width=30) (actual time=0.040..1051.240 rows=7983 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 42)) Rows Removed by Filter: 1992017 Buffers: shared hit=41278 read=5463 -> Sort (cost=381649.66..385649.66 rows=1600000 width=168) (actual time=4779.239..5013.364 rows=1603931 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1482006 read=188847 -> Nested Loop (cost=2.00..216772.53 rows=1600000 width=168) (actual time=0.100..3654.286 rows=1604080 loops=1) Buffers: shared hit=1482006 read=188847 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.080..99.994 rows=20051 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79949 Buffers: shared hit=4 read=2177 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.010..0.013 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=0.062..86.540 rows=100000 loops=1) Hash Cond: (supplier.s_nationkey = nation.n_nationkey) Buffers: shared hit=3 read=2177 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.003..40.133 rows=100000 loops=1) Buffers: shared hit=2 read=2177 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.032..0.032 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..0.012 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=0.013..0.157 rows=80 loops=20051) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1482002 read=186670 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.042..0.042 rows=1 loops=6360) Buffers: shared hit=155272 read=4705 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.026..0.040 rows=2 loops=6360) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155272 read=4705 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6360) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6360 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.018..0.036 rows=4 loops=6360) Buffers: shared hit=148912 read=4705 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.016..0.028 rows=4 loops=6360) Buffers: shared hit=98032 read=4705 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.012..0.013 rows=4 loops=6360) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21839 read=4433 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.003..0.003 rows=1 loops=25440) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76193 read=272 -> 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=25440) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50880 Planning time: 8.728 ms Execution time: 6783.668 ms (68 rows) COMMIT; COMMIT