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 = 31 and p_type like '%BRASS' 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=802636.55..802636.56 rows=1 width=190) (actual time=11896.743..11896.769 rows=100 loops=1) Buffers: shared hit=1602122 read=252547 written=528 -> Sort (cost=802636.55..802636.56 rows=1 width=190) (actual time=11896.741..11896.755 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=1602122 read=252547 written=528 -> Merge Join (cost=381650.08..802636.54 rows=1 width=190) (actual time=9145.078..11889.113 rows=4556 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1600 Buffers: shared hit=1602114 read=252547 written=528 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7945 width=30) (actual time=0.032..1343.954 rows=7788 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 31)) Rows Removed by Filter: 1992212 Buffers: shared hit=759 read=45982 written=124 -> Sort (cost=381649.66..385649.66 rows=1600000 width=168) (actual time=9144.639..9522.130 rows=1586780 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1451693 read=201375 written=389 -> Nested Loop (cost=2.00..216772.53 rows=1600000 width=168) (actual time=0.091..6988.453 rows=1586960 loops=1) Buffers: shared hit=1451693 read=201375 written=389 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.072..127.466 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=0.057..109.425 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=0.017..40.324 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.021..0.021 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..0.006 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..0.320 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1449512 read=201375 written=389 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.069..0.069 rows=1 loops=6156) Buffers: shared hit=149662 read=5190 written=15 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.045..0.067 rows=2 loops=6156) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=149662 read=5190 written=15 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6156) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6156 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.031..0.062 rows=4 loops=6156) Buffers: shared hit=143506 read=5190 written=15 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.028..0.052 rows=4 loops=6156) Buffers: shared hit=94258 read=5190 written=15 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.019..0.021 rows=4 loops=6156) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=20236 read=5190 written=15 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=24624) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=74022 -> 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=24624) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=49248 Planning time: 9.307 ms Execution time: 11930.378 ms (68 rows) COMMIT; COMMIT