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 = 3 and p_type like '%BRASS' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'EUROPE' 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 = 'EUROPE' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=805274.60..805274.60 rows=1 width=190) (actual time=9179.494..9179.518 rows=100 loops=1) Buffers: shared hit=1626266 read=246760 written=79 -> Sort (cost=805274.60..805274.60 rows=1 width=190) (actual time=9179.492..9179.504 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=1626266 read=246760 written=79 -> Merge Join (cost=381649.99..805274.59 rows=1 width=190) (actual time=6377.797..9173.954 rows=4657 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1582 Buffers: shared hit=1626258 read=246760 written=79 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8012 width=30) (actual time=0.476..1191.541 rows=7962 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 3)) Rows Removed by Filter: 1992038 Buffers: shared hit=1009 read=45732 -> Sort (cost=381649.56..385649.56 rows=1600000 width=168) (actual time=6376.652..6935.600 rows=1602640 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1472767 read=196659 written=79 -> Nested Loop (cost=2.00..216772.44 rows=1600000 width=168) (actual time=0.117..4644.311 rows=1602640 loops=1) Buffers: shared hit=1472767 read=196659 written=79 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.079..100.877 rows=20033 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79967 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.012 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.047..86.403 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=0.006..34.014 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.020..0.020 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=0.005..0.010 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=0.014..0.207 rows=80 loops=20033) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1470586 read=196659 written=79 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.057..0.057 rows=1 loops=6239) Buffers: shared hit=152482 read=4369 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.036..0.055 rows=2 loops=6239) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=152482 read=4369 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=6239) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6239 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.024..0.051 rows=4 loops=6239) Buffers: shared hit=146243 read=4369 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.021..0.042 rows=4 loops=6239) Buffers: shared hit=96333 read=4367 -> 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=6239) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21339 read=4367 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.005..0.006 rows=1 loops=24956) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=74994 -> Index Scan using pk_nation on nation nation_1 (cost=0.14..0.16 rows=1 width=8) (actual time=0.001..0.002 rows=1 loops=24956) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=49910 read=2 Planning time: 5.415 ms Execution time: 9259.660 ms (68 rows) COMMIT; COMMIT