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 = 45 and p_type like '%COPPER' 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=794817.90..794817.90 rows=1 width=190) (actual time=8540.221..8540.247 rows=100 loops=1) Buffers: shared hit=1694164 read=164610 written=11512 -> Sort (cost=794817.90..794817.90 rows=1 width=190) (actual time=8540.218..8540.231 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=1694164 read=164610 written=11512 -> Merge Join (cost=381554.45..794817.89 rows=1 width=190) (actual time=5970.627..8534.547 rows=4641 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1679 Buffers: shared hit=1694156 read=164610 written=11512 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7788 width=30) (actual time=0.015..1223.460 rows=7943 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 45)) Rows Removed by Filter: 1992057 Buffers: shared hit=757 read=45984 written=1113 -> Sort (cost=381554.03..385551.87 rows=1599136 width=168) (actual time=5970.324..6401.652 rows=1586782 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1538744 read=114324 written=10296 -> Nested Loop (cost=2.00..216772.17 rows=1599136 width=168) (actual time=0.059..4354.266 rows=1586960 loops=1) Buffers: shared hit=1538744 read=114324 written=10296 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.049..104.963 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=0.038..89.390 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..34.547 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.018..0.018 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=0.002..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..0.194 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1536563 read=114324 written=10296 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.056..0.056 rows=1 loops=6320) Buffers: shared hit=154655 read=4302 written=103 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.035..0.054 rows=2 loops=6320) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=154655 read=4302 written=103 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6320) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6320 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.023..0.050 rows=4 loops=6320) Buffers: shared hit=148335 read=4302 written=103 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.021..0.041 rows=4 loops=6320) Buffers: shared hit=97775 read=4302 written=103 -> 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=6320) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21801 read=4302 written=103 -> 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=25280) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=75974 -> 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=25280) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50560 Planning time: 5.145 ms Execution time: 8597.705 ms (68 rows) COMMIT; COMMIT