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 = 48 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=805665.47..805665.48 rows=1 width=190) (actual time=14067.448..14067.471 rows=100 loops=1) Buffers: shared hit=1566980 read=293636 written=244 -> Sort (cost=805665.47..805665.48 rows=1 width=190) (actual time=14067.446..14067.462 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=1566980 read=293636 written=244 -> Merge Join (cost=381650.08..805665.46 rows=1 width=190) (actual time=10999.672..14060.801 rows=4795 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1596 Buffers: shared hit=1566972 read=293636 written=244 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8022 width=30) (actual time=0.259..1188.069 rows=8046 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 48)) Rows Removed by Filter: 1991954 Buffers: shared hit=8027 read=38714 written=32 -> Sort (cost=381649.66..385649.66 rows=1600000 width=168) (actual time=10999.017..11649.434 rows=1586872 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1406047 read=247021 written=204 -> Nested Loop (cost=2.00..216772.53 rows=1600000 width=168) (actual time=0.092..7324.264 rows=1586960 loops=1) Buffers: shared hit=1406047 read=247021 written=204 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.073..132.550 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=0.008..0.011 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=0.058..114.739 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=0.011..42.362 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.026..0.026 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=0.004..0.011 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=0.019..0.338 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1403866 read=247021 written=204 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.064..0.064 rows=1 loops=6391) Buffers: shared hit=152898 read=7901 written=8 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.043..0.062 rows=2 loops=6391) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=152898 read=7901 written=8 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6391) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6391 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.030..0.058 rows=4 loops=6391) Buffers: shared hit=146507 read=7901 written=8 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.028..0.048 rows=4 loops=6391) Buffers: shared hit=95379 read=7901 written=8 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.021..0.023 rows=4 loops=6391) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=18521 read=7901 written=8 -> 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=25564) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76858 -> 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=25564) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51128 Planning time: 8.726 ms Execution time: 14138.334 ms (68 rows) COMMIT; COMMIT