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 = 7 and p_type like '%NICKEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' 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 = 'ASIA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=806787.04..806787.04 rows=1 width=190) (actual time=12708.936..12708.971 rows=100 loops=1) Buffers: shared hit=1489081 read=389738 written=13279 -> Sort (cost=806787.04..806787.04 rows=1 width=190) (actual time=12708.932..12708.950 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=1489081 read=389738 written=13279 -> Merge Join (cost=381554.45..806787.03 rows=1 width=190) (actual time=9877.822..12703.378 rows=4761 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1698 Buffers: shared hit=1489073 read=389738 written=13279 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8096 width=30) (actual time=0.125..1256.475 rows=7899 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 7)) Rows Removed by Filter: 1992101 Buffers: shared hit=5066 read=41675 written=70 -> Sort (cost=381554.03..385551.87 rows=1599136 width=168) (actual time=9877.269..10331.236 rows=1602909 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1328225 read=341457 written=13201 -> Nested Loop (cost=2.00..216772.17 rows=1599136 width=168) (actual time=0.115..7864.435 rows=1602960 loops=1) Buffers: shared hit=1328225 read=341457 written=13201 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.065..113.417 rows=20037 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79963 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.005..0.014 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.050..97.403 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=0.007..35.551 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.022..0.022 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..0.007 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=0.018..0.364 rows=80 loops=20037) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1326044 read=341457 written=13201 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.065..0.065 rows=1 loops=6459) Buffers: shared hit=155782 read=6606 written=8 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.042..0.063 rows=2 loops=6459) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155782 read=6606 written=8 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=6459) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6459 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.029..0.059 rows=4 loops=6459) Buffers: shared hit=149323 read=6606 written=8 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.026..0.049 rows=4 loops=6459) Buffers: shared hit=97651 read=6606 written=8 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.019..0.021 rows=4 loops=6459) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=20020 read=6606 written=8 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=25836) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77631 -> 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=25836) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51672 Planning time: 5.572 ms Execution time: 12740.616 ms (68 rows) COMMIT; COMMIT