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 = 36 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=797456.25..797456.26 rows=1 width=190) (actual time=19729.613..19729.648 rows=100 loops=1) Buffers: shared hit=1394682 read=480312 written=562 -> Sort (cost=797456.25..797456.26 rows=1 width=190) (actual time=19729.610..19729.638 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=1394682 read=480312 written=562 -> Merge Join (cost=381648.19..797456.24 rows=1 width=190) (actual time=16508.280..19723.663 rows=4687 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1618 Buffers: shared hit=1394674 read=480312 written=562 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7813 width=30) (actual time=0.157..1164.891 rows=8019 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 36)) Rows Removed by Filter: 1991981 Buffers: shared hit=27232 read=19509 written=1 -> Sort (cost=381647.76..385647.76 rows=1600000 width=168) (actual time=16507.203..17227.685 rows=1602518 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1216398 read=453284 written=560 -> Nested Loop (cost=2.00..216770.64 rows=1600000 width=168) (actual time=0.118..8688.387 rows=1602960 loops=1) Buffers: shared hit=1216398 read=453284 written=560 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.063..121.394 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=0.007..0.011 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=0.045..105.224 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..38.293 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.024..0.024 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..0.005 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..0.404 rows=80 loops=20037) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1214217 read=453284 written=560 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.071..0.071 rows=1 loops=6305) Buffers: shared hit=151044 read=7519 written=1 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.048..0.069 rows=2 loops=6305) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=151044 read=7519 written=1 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6305) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6305 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.034..0.065 rows=4 loops=6305) Buffers: shared hit=144739 read=7519 written=1 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.031..0.055 rows=4 loops=6305) Buffers: shared hit=94300 read=7518 written=1 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.023..0.024 rows=4 loops=6305) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=18496 read=7518 written=1 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=25220) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=75804 -> 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=25220) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50439 read=1 Planning time: 6.097 ms Execution time: 19808.454 ms (68 rows) COMMIT; COMMIT