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 = 22 and p_type like '%BRASS' 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=806005.38..806005.38 rows=1 width=190) (actual time=13938.916..13938.949 rows=100 loops=1) Buffers: shared hit=1307821 read=566221 written=15732 -> Sort (cost=806005.38..806005.38 rows=1 width=190) (actual time=13938.914..13938.938 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=1307821 read=566221 written=15732 -> Merge Join (cost=381554.45..806005.37 rows=1 width=190) (actual time=11108.926..13933.190 rows=4656 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1612 Buffers: shared hit=1307813 read=566221 written=15732 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8075 width=30) (actual time=0.076..1188.673 rows=7941 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 22)) Rows Removed by Filter: 1992059 Buffers: shared hit=2241 read=44500 written=57 -> Sort (cost=381554.03..385551.87 rows=1599136 width=168) (actual time=11108.501..11605.310 rows=1602851 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1154846 read=514836 written=15668 -> Nested Loop (cost=2.00..216772.17 rows=1599136 width=168) (actual time=0.134..9464.030 rows=1602960 loops=1) Buffers: shared hit=1154846 read=514836 written=15668 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.090..128.029 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=0.008..0.012 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=0.066..110.921 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=0.012..40.414 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.031..0.031 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..0.013 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=0.019..0.441 rows=80 loops=20037) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1152665 read=514836 written=15668 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.063..0.064 rows=1 loops=6268) Buffers: shared hit=150726 read=6885 written=7 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.042..0.061 rows=2 loops=6268) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=150726 read=6885 written=7 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=6268) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6268 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.028..0.057 rows=4 loops=6268) Buffers: shared hit=144458 read=6885 written=7 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.026..0.048 rows=4 loops=6268) Buffers: shared hit=94314 read=6885 written=7 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.019..0.020 rows=4 loops=6268) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=18956 read=6885 written=7 -> 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=25072) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=75358 -> 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=25072) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50144 Planning time: 6.743 ms Execution time: 13982.360 ms (68 rows) COMMIT; COMMIT