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 = 22 and p_type like '%NICKEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'MIDDLE EAST' 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 = 'MIDDLE EAST' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=808596.69..808596.70 rows=1 width=190) (actual time=11182.664..11182.691 rows=100 loops=1) Buffers: shared hit=1662789 read=217926 written=264 -> Sort (cost=808596.69..808596.70 rows=1 width=190) (actual time=11182.658..11182.672 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=1662789 read=217926 written=264 -> Merge Join (cost=381650.08..808596.68 rows=1 width=190) (actual time=8098.330..11176.818 rows=4777 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1733 Buffers: shared hit=1662781 read=217926 written=264 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8097 width=30) (actual time=0.346..1478.804 rows=8084 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 22)) Rows Removed by Filter: 1991916 Buffers: shared hit=758 read=45983 -> Sort (cost=381649.66..385649.66 rows=1600000 width=168) (actual time=8096.683..8582.767 rows=1603276 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475045kB Buffers: shared hit=1502979 read=167300 written=264 -> Nested Loop (cost=2.00..216772.53 rows=1600000 width=168) (actual time=0.101..6241.403 rows=1603360 loops=1) Buffers: shared hit=1502979 read=167300 written=264 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.082..122.287 rows=20042 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79958 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.010 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.062..104.633 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=0.015..39.645 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.025..0.025 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=0.005..0.008 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..0.280 rows=80 loops=20042) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1500798 read=167300 written=264 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.063..0.064 rows=1 loops=6510) Buffers: shared hit=159044 read=4643 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.040..0.061 rows=2 loops=6510) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=159044 read=4643 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6510) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6510 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.027..0.057 rows=4 loops=6510) Buffers: shared hit=152534 read=4643 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.024..0.046 rows=4 loops=6510) Buffers: shared hit=100454 read=4643 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.016..0.018 rows=4 loops=6510) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22211 read=4643 -> 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=26040) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=78243 -> Index Scan using pk_nation on nation nation_1 (cost=0.14..0.16 rows=1 width=8) (actual time=0.002..0.002 rows=1 loops=26040) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=52080 Planning time: 9.028 ms Execution time: 11222.131 ms (68 rows) COMMIT; COMMIT