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 = 41 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=810990.47..810990.47 rows=1 width=190) (actual time=9361.486..9361.509 rows=100 loops=1) Buffers: shared hit=1683500 read=197025 written=881 -> Sort (cost=810990.47..810990.47 rows=1 width=190) (actual time=9361.484..9361.496 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=1683500 read=197025 written=881 -> Merge Join (cost=381649.99..810990.46 rows=1 width=190) (actual time=7069.640..9356.680 rows=4735 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1744 Buffers: shared hit=1683492 read=197025 written=881 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8159 width=30) (actual time=0.075..1091.051 rows=8088 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 41)) Rows Removed by Filter: 1991912 Buffers: shared hit=15939 read=30802 written=99 -> Sort (cost=381649.56..385649.56 rows=1600000 width=168) (actual time=7069.290..7395.010 rows=1604003 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1507702 read=163151 written=777 -> Nested Loop (cost=2.00..216772.44 rows=1600000 width=168) (actual time=0.064..4508.609 rows=1604080 loops=1) Buffers: shared hit=1507702 read=163151 written=777 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.050..96.815 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=0.004..0.007 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=0.041..82.994 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..32.727 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.017..0.017 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..0.006 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=0.015..0.200 rows=80 loops=20051) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1505521 read=163151 written=777 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.052..0.052 rows=1 loops=6479) Buffers: shared hit=159851 read=3072 written=5 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.032..0.050 rows=2 loops=6479) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=159851 read=3072 written=5 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6479) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6479 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.021..0.046 rows=4 loops=6479) Buffers: shared hit=153372 read=3072 written=5 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.019..0.038 rows=4 loops=6479) Buffers: shared hit=101540 read=3072 written=5 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.012..0.014 rows=4 loops=6479) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=23674 read=3072 written=5 -> 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=25916) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77866 -> 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=25916) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51832 Planning time: 4.710 ms Execution time: 9392.772 ms (68 rows) COMMIT; COMMIT