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 = 11 and p_type like '%NICKEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AFRICA' 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 = 'AFRICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=798726.19..798726.20 rows=1 width=190) (actual time=10938.240..10938.265 rows=100 loops=1) Buffers: shared hit=1497303 read=362518 written=760 -> Sort (cost=798726.19..798726.20 rows=1 width=190) (actual time=10938.237..10938.251 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=1497303 read=362518 written=760 -> Merge Join (cost=381554.45..798726.18 rows=1 width=190) (actual time=8561.089..10932.771 rows=4754 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1604 Buffers: shared hit=1497295 read=362518 written=760 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7889 width=30) (actual time=0.335..1141.790 rows=7980 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 11)) Rows Removed by Filter: 1992020 Buffers: shared hit=8649 read=38092 written=5 -> Sort (cost=381554.03..385551.87 rows=1599136 width=168) (actual time=8560.357..8901.325 rows=1586890 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1333006 read=320062 written=754 -> Nested Loop (cost=2.00..216772.17 rows=1599136 width=168) (actual time=0.088..5970.484 rows=1586960 loops=1) Buffers: shared hit=1333006 read=320062 written=754 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.078..105.936 rows=19837 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.010 rows=1 loops=1) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.060..90.771 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=0.006..34.869 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.039..0.039 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=0.001..0.020 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..0.274 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1330825 read=320062 written=754 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.055..0.056 rows=1 loops=6358) Buffers: shared hit=155640 read=4364 written=1 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.035..0.054 rows=2 loops=6358) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155640 read=4364 written=1 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6358) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6358 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.023..0.050 rows=4 loops=6358) Buffers: shared hit=149282 read=4364 written=1 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.021..0.041 rows=4 loops=6358) Buffers: shared hit=98420 read=4362 written=1 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.014..0.016 rows=4 loops=6358) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21985 read=4362 written=1 -> 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=25432) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76435 -> 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=25432) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50862 read=2 Planning time: 5.694 ms Execution time: 10976.525 ms (68 rows) COMMIT; COMMIT