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 = 47 and p_type like '%STEEL' 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=882900.66..882900.67 rows=1 width=190) (actual time=9279.399..9279.419 rows=100 loops=1) Buffers: shared hit=184253 read=206942 written=10382 -> Sort (cost=882900.66..882900.67 rows=1 width=190) (actual time=9279.399..9279.414 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=184253 read=206942 written=10382 -> Merge Join (cost=465676.21..882900.65 rows=1 width=190) (actual time=7246.955..9274.541 rows=4736 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1726 Buffers: shared hit=184245 read=206942 written=10382 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7929 width=30) (actual time=0.400..1222.957 rows=7985 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 47)) Rows Removed by Filter: 1992015 Buffers: shared hit=756 read=45985 written=832 -> Sort (cost=465675.78..469675.54 rows=1599904 width=168) (actual time=7245.682..7362.427 rows=1602884 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=29294 read=152567 written=9405 -> Hash Join (cost=3852.20..300809.24 rows=1599904 width=168) (actual time=157.431..6089.572 rows=1602960 loops=1) Hash Cond: (partsupp.ps_suppkey = supplier.s_suppkey) Buffers: shared hit=29294 read=152567 written=9405 -> Seq Scan on partsupp (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.004..3514.879 rows=8000000 loops=1) Buffers: shared hit=18392 read=152566 written=9405 -> Hash (cost=3602.20..3602.20 rows=20000 width=164) (actual time=157.272..157.272 rows=20037 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 4154kB Buffers: shared hit=10902 read=1 -> Nested Loop (cost=332.07..3602.20 rows=20000 width=164) (actual time=0.423..145.842 rows=20037 loops=1) Buffers: shared hit=10902 read=1 -> Hash Join (cost=1.07..2.47 rows=5 width=30) (actual time=0.024..0.043 rows=5 loops=1) Hash Cond: (nation.n_regionkey = region.r_regionkey) Buffers: shared hit=2 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.003..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.009..0.009 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.005..0.006 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on supplier (cost=331.00..679.95 rows=4000 width=142) (actual time=0.276..28.325 rows=4007 loops=5) Recheck Cond: (s_nationkey = nation.n_nationkey) Rows Removed by Index Recheck: 95993 Heap Blocks: lossy=10895 Buffers: shared hit=10900 read=1 -> Bitmap Index Scan on supplier_s_nationkey_s_suppkey_brin_idx (cost=0.00..330.00 rows=4000 width=0) (actual time=0.260..0.260 rows=23040 loops=5) Index Cond: (s_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=1 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.061..0.062 rows=1 loops=6462) Buffers: shared hit=154195 read=8390 written=145 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.040..0.056 rows=2 loops=6462) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=154195 read=8390 written=145 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6462) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6462 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.029..0.052 rows=4 loops=6462) Buffers: shared hit=147733 read=8390 written=145 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.027..0.043 rows=4 loops=6462) Buffers: shared hit=96037 read=8390 written=145 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.021..0.023 rows=4 loops=6462) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=18356 read=8390 written=145 -> 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=25848) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77681 -> 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=25848) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51696 Planning time: 5.028 ms Execution time: 9315.179 ms (75 rows) COMMIT; COMMIT