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 = 42 and p_type like '%COPPER' 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=800584.36..800584.36 rows=1 width=190) (actual time=8265.788..8265.813 rows=100 loops=1) Buffers: shared hit=1681847 read=198947 -> Sort (cost=800584.36..800584.36 rows=1 width=190) (actual time=8265.785..8265.798 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=1681847 read=198947 -> Merge Join (cost=381649.64..800584.35 rows=1 width=190) (actual time=5843.901..8261.158 rows=4788 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1750 Buffers: shared hit=1681839 read=198947 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7905 width=30) (actual time=0.143..996.149 rows=8034 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 42)) Rows Removed by Filter: 1991966 Buffers: shared hit=41278 read=5463 -> Sort (cost=381649.21..385649.21 rows=1600000 width=168) (actual time=5843.071..6222.683 rows=1602871 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1480923 read=188759 -> Nested Loop (cost=2.00..216772.09 rows=1600000 width=168) (actual time=0.145..4603.321 rows=1602960 loops=1) Buffers: shared hit=1480923 read=188759 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.094..105.921 rows=20037 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79963 Buffers: shared hit=4 read=2177 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.010..0.013 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=0.063..92.224 rows=100000 loops=1) Hash Cond: (supplier.s_nationkey = nation.n_nationkey) Buffers: shared hit=3 read=2177 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.004..45.547 rows=100000 loops=1) Buffers: shared hit=2 read=2177 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.031..0.031 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..0.013 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..0.203 rows=80 loops=20037) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1480919 read=186582 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.051..0.051 rows=1 loops=6538) Buffers: shared hit=159638 read=4725 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.033..0.050 rows=2 loops=6538) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=159638 read=4725 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6538) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6538 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.023..0.046 rows=4 loops=6538) Buffers: shared hit=153100 read=4725 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.021..0.038 rows=4 loops=6538) Buffers: shared hit=100796 read=4725 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.015..0.017 rows=4 loops=6538) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22470 read=4453 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.004..0.005 rows=1 loops=26152) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=78326 read=272 -> 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=26152) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=52304 Planning time: 8.735 ms Execution time: 8289.409 ms (68 rows) COMMIT; COMMIT