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 = 5 and p_type like '%COPPER' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AFRICA' 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 = 'AFRICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=804669.39..804669.39 rows=1 width=190) (actual time=7888.195..7888.222 rows=100 loops=1) Buffers: shared hit=1748450 read=111132 written=72 -> Sort (cost=804669.39..804669.39 rows=1 width=190) (actual time=7888.194..7888.207 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=1748450 read=111132 written=72 -> Merge Join (cost=381398.14..804669.38 rows=1 width=190) (actual time=5266.408..7882.620 rows=4676 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1674 Buffers: shared hit=1748442 read=111132 written=72 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8015 width=30) (actual time=0.180..1272.467 rows=8066 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 5)) Rows Removed by Filter: 1991934 Buffers: shared hit=758 read=45983 written=44 -> Sort (cost=381397.71..385392.00 rows=1597715 width=168) (actual time=5265.949..5669.925 rows=1586623 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1592266 read=60802 written=25 -> Nested Loop (cost=2.00..216772.52 rows=1597715 width=168) (actual time=0.072..3720.565 rows=1586960 loops=1) Buffers: shared hit=1592266 read=60802 written=25 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.055..98.825 rows=19837 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.010 rows=1 loops=1) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.044..84.067 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=0.008..31.813 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.019..0.019 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=0.002..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=0.015..0.163 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1590085 read=60802 written=25 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.057..0.057 rows=1 loops=6350) Buffers: shared hit=155418 read=4347 written=3 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.036..0.055 rows=2 loops=6350) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155418 read=4347 written=3 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6350) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6350 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.025..0.051 rows=4 loops=6350) Buffers: shared hit=149068 read=4347 written=3 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.022..0.041 rows=4 loops=6350) Buffers: shared hit=98268 read=4347 written=3 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.015..0.017 rows=4 loops=6350) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21940 read=4347 written=3 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=25400) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76328 -> 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=25400) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50800 Planning time: 6.026 ms Execution time: 7928.609 ms (68 rows) COMMIT; COMMIT