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 '%NICKEL' 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=806054.49..806054.49 rows=1 width=190) (actual time=8861.866..8861.888 rows=100 loops=1) Buffers: shared hit=1800932 read=81814 written=7 -> Sort (cost=806054.49..806054.49 rows=1 width=190) (actual time=8861.864..8861.877 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=1800932 read=81814 written=7 -> Merge Join (cost=381648.19..806054.48 rows=1 width=190) (actual time=5976.862..8855.505 rows=4834 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1730 Buffers: shared hit=1800924 read=81814 written=7 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8032 width=30) (actual time=0.066..1317.499 rows=8162 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 34)) Rows Removed by Filter: 1991838 Buffers: shared hit=756 read=45985 written=3 -> Sort (cost=381647.76..385647.76 rows=1600000 width=168) (actual time=5976.591..6500.548 rows=1604047 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1639505 read=31348 written=4 -> Nested Loop (cost=2.00..216770.64 rows=1600000 width=168) (actual time=0.059..3899.336 rows=1604080 loops=1) Buffers: shared hit=1639505 read=31348 written=4 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.049..102.767 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..0.008 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..87.391 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..34.027 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.018..0.018 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..0.006 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=0.016..0.168 rows=80 loops=20051) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1637324 read=31348 written=4 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.062..0.062 rows=1 loops=6564) Buffers: shared hit=160663 read=4481 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.039..0.060 rows=2 loops=6564) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=160663 read=4481 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6564) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6564 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.026..0.056 rows=4 loops=6564) Buffers: shared hit=154099 read=4481 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.024..0.046 rows=4 loops=6564) Buffers: shared hit=101587 read=4481 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.016..0.017 rows=4 loops=6564) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22675 read=4481 -> 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=26256) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=78912 -> 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=26256) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=52512 Planning time: 5.987 ms Execution time: 8928.147 ms (68 rows) COMMIT; COMMIT