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 = 9 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=803709.51..803709.52 rows=1 width=190) (actual time=15297.829..15297.861 rows=100 loops=1) Buffers: shared hit=1483774 read=395148 written=211 -> Sort (cost=803709.51..803709.52 rows=1 width=190) (actual time=15297.825..15297.844 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=1483774 read=395148 written=211 -> Merge Join (cost=381648.19..803709.50 rows=1 width=190) (actual time=12330.983..15291.201 rows=4755 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1657 Buffers: shared hit=1483766 read=395148 written=211 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7972 width=30) (actual time=0.297..1274.683 rows=8077 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 9)) Rows Removed by Filter: 1991923 Buffers: shared hit=756 read=45985 written=23 -> Sort (cost=381647.76..385647.76 rows=1600000 width=168) (actual time=12329.593..12910.093 rows=1604039 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1329241 read=341612 written=185 -> Nested Loop (cost=2.00..216770.64 rows=1600000 width=168) (actual time=0.069..7519.275 rows=1604080 loops=1) Buffers: shared hit=1329241 read=341612 written=185 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.055..109.421 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..0.011 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=0.045..94.125 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..35.198 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..0.005 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..0.347 rows=80 loops=20051) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1327060 read=341612 written=185 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.069..0.069 rows=1 loops=6412) Buffers: shared hit=153769 read=7551 written=3 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.046..0.067 rows=2 loops=6412) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=153769 read=7551 written=3 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6412) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6412 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.032..0.063 rows=4 loops=6412) Buffers: shared hit=147357 read=7551 written=3 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.029..0.053 rows=4 loops=6412) Buffers: shared hit=96063 read=7549 written=3 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.021..0.023 rows=4 loops=6412) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=18967 read=7549 written=3 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=25648) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77096 -> 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=25648) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51294 read=2 Planning time: 6.347 ms Execution time: 15364.668 ms (68 rows) COMMIT; COMMIT