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 = 17 and p_type like '%NICKEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' 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 = 'ASIA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=804913.66..804913.66 rows=1 width=190) (actual time=12351.765..12351.789 rows=100 loops=1) Buffers: shared hit=1542157 read=334327 written=834 -> Sort (cost=804913.66..804913.66 rows=1 width=190) (actual time=12351.762..12351.773 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=1542157 read=334327 written=834 -> Merge Join (cost=381398.14..804913.65 rows=1 width=190) (actual time=9750.863..12345.543 rows=4731 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1635 Buffers: shared hit=1542149 read=334327 written=834 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8022 width=30) (actual time=0.901..1272.204 rows=8121 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 17)) Rows Removed by Filter: 1991879 Buffers: shared hit=1535 read=45206 written=84 -> Sort (cost=381397.71..385392.00 rows=1597715 width=168) (actual time=9749.213..10122.344 rows=1602766 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1386650 read=283032 written=734 -> Nested Loop (cost=2.00..216772.52 rows=1597715 width=168) (actual time=0.106..7192.133 rows=1602960 loops=1) Buffers: shared hit=1386650 read=283032 written=734 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.058..113.710 rows=20037 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79963 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.007..0.010 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.040..97.128 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..36.853 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.020..0.020 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..0.003 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=0.018..0.331 rows=80 loops=20037) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1384469 read=283032 written=734 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.064..0.064 rows=1 loops=6366) Buffers: shared hit=153964 read=6089 written=16 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.042..0.062 rows=2 loops=6366) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=153964 read=6089 written=16 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6366) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6366 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.029..0.058 rows=4 loops=6366) Buffers: shared hit=147598 read=6089 written=16 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.026..0.048 rows=4 loops=6366) Buffers: shared hit=96672 read=6087 written=16 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.018..0.020 rows=4 loops=6366) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=20126 read=6087 written=16 -> 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=25464) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76546 -> 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=25464) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50926 read=2 Planning time: 6.569 ms Execution time: 12389.946 ms (68 rows) COMMIT; COMMIT