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 = 6 and p_type like '%TIN' 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=799607.63..799607.63 rows=1 width=190) (actual time=14132.411..14132.445 rows=100 loops=1) Buffers: shared hit=1465622 read=392239 -> Sort (cost=799607.63..799607.63 rows=1 width=190) (actual time=14132.406..14132.427 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=1465622 read=392239 -> Merge Join (cost=381650.08..799607.62 rows=1 width=190) (actual time=10976.159..14124.793 rows=4666 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1621 Buffers: shared hit=1465614 read=392239 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7868 width=30) (actual time=0.300..1427.460 rows=8042 loops=1) Filter: (((p_type)::text ~~ '%TIN'::text) AND (p_size = 6)) Rows Removed by Filter: 1991958 Buffers: shared hit=6640 read=40101 -> Sort (cost=381649.66..385649.66 rows=1600000 width=168) (actual time=10975.402..11541.427 rows=1586500 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1305809 read=347259 -> Nested Loop (cost=2.00..216772.53 rows=1600000 width=168) (actual time=0.071..8789.164 rows=1586960 loops=1) Buffers: shared hit=1305809 read=347259 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.059..132.274 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=0.007..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=0.046..114.774 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=0.009..40.777 rows=100000 loops=1) Buffers: shared hit=2179 -> 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=0.004..0.012 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=0.021..0.413 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1303628 read=347259 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.072..0.072 rows=1 loops=6287) Buffers: shared hit=153165 read=4879 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.045..0.070 rows=2 loops=6287) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=153165 read=4879 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6287) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6287 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.030..0.065 rows=4 loops=6287) Buffers: shared hit=146878 read=4879 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.027..0.053 rows=4 loops=6287) Buffers: shared hit=96582 read=4879 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.018..0.020 rows=4 loops=6287) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21013 read=4879 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=25148) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=75569 -> 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=25148) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50296 Planning time: 6.801 ms Execution time: 14186.605 ms (68 rows) COMMIT; COMMIT