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 = 19 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=797456.00..797456.00 rows=1 width=190) (actual time=8245.485..8245.509 rows=100 loops=1) Buffers: shared hit=1661228 read=198838 -> Sort (cost=797456.00..797456.00 rows=1 width=190) (actual time=8245.483..8245.495 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=1661228 read=198838 -> Merge Join (cost=381554.45..797455.99 rows=1 width=190) (actual time=5696.482..8240.810 rows=4708 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1661 Buffers: shared hit=1661220 read=198838 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7856 width=30) (actual time=0.040..1061.785 rows=7928 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 19)) Rows Removed by Filter: 1992072 Buffers: shared hit=41278 read=5463 -> Sort (cost=381554.03..385551.87 rows=1599136 width=168) (actual time=5696.093..6090.583 rows=1586723 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1464352 read=188716 -> Nested Loop (cost=2.00..216772.17 rows=1599136 width=168) (actual time=0.108..4429.113 rows=1586960 loops=1) Buffers: shared hit=1464352 read=188716 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.089..108.605 rows=19837 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=4 read=2177 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.013 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=0.071..94.468 rows=100000 loops=1) Hash Cond: (supplier.s_nationkey = nation.n_nationkey) Buffers: shared hit=3 read=2177 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.004..48.277 rows=100000 loops=1) Buffers: shared hit=2 read=2177 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.036..0.036 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..0.013 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=0.016..0.197 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1464348 read=186539 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.053..0.053 rows=1 loops=6369) Buffers: shared hit=155590 read=4659 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.034..0.051 rows=2 loops=6369) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155590 read=4659 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6369) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6369 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.023..0.048 rows=4 loops=6369) Buffers: shared hit=149221 read=4659 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.020..0.040 rows=4 loops=6369) Buffers: shared hit=98269 read=4659 -> 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=6369) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21978 read=4387 -> 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=25476) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76291 read=272 -> Index Scan using pk_nation on nation nation_1 (cost=0.14..0.16 rows=1 width=8) (actual time=0.001..0.001 rows=1 loops=25476) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50952 Planning time: 8.801 ms Execution time: 8266.109 ms (68 rows) COMMIT; COMMIT