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 = 30 and p_type like '%STEEL' 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=798190.53..798190.54 rows=1 width=190) (actual time=8509.319..8509.342 rows=100 loops=1) Buffers: shared hit=1622130 read=239376 -> Sort (cost=798190.53..798190.54 rows=1 width=190) (actual time=8509.317..8509.330 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=1622130 read=239376 -> Merge Join (cost=381649.64..798190.52 rows=1 width=190) (actual time=6402.285..8504.564 rows=4743 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1686 Buffers: shared hit=1622122 read=239376 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7844 width=30) (actual time=0.081..1030.043 rows=7999 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 30)) Rows Removed by Filter: 1992001 Buffers: shared hit=758 read=45983 -> Sort (cost=381649.21..385649.21 rows=1600000 width=168) (actual time=6400.228..6724.385 rows=1586380 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1464352 read=188716 -> Nested Loop (cost=2.00..216772.09 rows=1600000 width=168) (actual time=0.060..4321.977 rows=1586960 loops=1) Buffers: shared hit=1464352 read=188716 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.050..101.881 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=0.007..0.017 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=0.039..87.831 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=0.002..39.779 rows=100000 loops=1) Buffers: shared hit=2 read=2177 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.019..0.019 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..0.004 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=0.013..0.192 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=0.046..0.046 rows=1 loops=6429) Buffers: shared hit=157012 read=4677 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.029..0.044 rows=2 loops=6429) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157012 read=4677 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6429) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6429 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.019..0.041 rows=4 loops=6429) Buffers: shared hit=150583 read=4677 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.017..0.032 rows=4 loops=6429) Buffers: shared hit=99151 read=4677 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.011..0.013 rows=4 loops=6429) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22119 read=4405 -> 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=25716) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77032 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=25716) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51432 Planning time: 5.109 ms Execution time: 8571.957 ms (68 rows) COMMIT; COMMIT