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 = 2 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=802001.37..802001.37 rows=1 width=190) (actual time=7441.269..7441.292 rows=100 loops=1) Buffers: shared hit=1711224 read=151852 -> Sort (cost=802001.37..802001.37 rows=1 width=190) (actual time=7441.266..7441.280 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=1711224 read=151852 -> Merge Join (cost=381649.95..802001.36 rows=1 width=190) (actual time=5180.521..7436.721 rows=4824 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1667 Buffers: shared hit=1711216 read=151852 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7943 width=30) (actual time=0.072..1056.452 rows=8116 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 2)) Rows Removed by Filter: 1991884 Buffers: shared hit=777 read=45964 -> Sort (cost=381649.50..385649.50 rows=1600000 width=168) (actual time=5180.182..5525.928 rows=1585934 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1551394 read=101674 -> Nested Loop (cost=2.00..216772.37 rows=1600000 width=168) (actual time=0.069..3294.500 rows=1586960 loops=1) Buffers: shared hit=1551394 read=101674 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.058..86.183 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=0.005..0.008 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=0.049..72.461 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=0.007..25.284 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.016..0.016 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..0.008 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=0.012..0.143 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1549213 read=101674 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.046..0.046 rows=1 loops=6491) Buffers: shared hit=159045 read=4214 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.029..0.044 rows=2 loops=6491) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=159045 read=4214 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6491) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6491 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.019..0.041 rows=4 loops=6491) Buffers: shared hit=152554 read=4214 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.017..0.033 rows=4 loops=6491) Buffers: shared hit=100626 read=4214 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.012..0.014 rows=4 loops=6491) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22616 read=4214 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.004..0.004 rows=1 loops=25964) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=78010 -> 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=25964) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51928 Planning time: 4.750 ms Execution time: 7486.539 ms (68 rows) COMMIT; COMMIT