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 = 24 and p_type like '%BRASS' 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=805321.43..805321.43 rows=1 width=190) (actual time=9961.392..9961.417 rows=100 loops=1) Buffers: shared hit=1523020 read=353805 written=6 -> Sort (cost=805321.43..805321.43 rows=1 width=190) (actual time=9961.389..9961.401 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=1523020 read=353805 written=6 -> Merge Join (cost=381554.45..805321.42 rows=1 width=190) (actual time=7404.143..9955.225 rows=4696 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1682 Buffers: shared hit=1523012 read=353805 written=6 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8058 width=30) (actual time=0.404..1153.168 rows=8040 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 24)) Rows Removed by Filter: 1991960 Buffers: shared hit=757 read=45984 -> Sort (cost=381554.03..385551.87 rows=1599136 width=168) (actual time=7403.182..7874.440 rows=1602831 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1366286 read=303396 written=6 -> Nested Loop (cost=2.00..216772.17 rows=1599136 width=168) (actual time=0.100..5988.215 rows=1602960 loops=1) Buffers: shared hit=1366286 read=303396 written=6 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.062..111.159 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=0.005..0.008 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=0.046..95.269 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..36.245 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.022..0.022 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=0.015..0.273 rows=80 loops=20037) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1364105 read=303396 written=6 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.055..0.055 rows=1 loops=6378) Buffers: shared hit=155969 read=4425 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.035..0.053 rows=2 loops=6378) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155969 read=4425 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=6378) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6378 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.023..0.049 rows=4 loops=6378) Buffers: shared hit=149591 read=4425 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.020..0.040 rows=4 loops=6378) Buffers: shared hit=98569 read=4423 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.014..0.015 rows=4 loops=6378) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21884 read=4423 -> 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=25512) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76685 -> 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=25512) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51022 read=2 Planning time: 6.076 ms Execution time: 10009.833 ms (68 rows) COMMIT; COMMIT