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 = 8 and p_type like '%STEEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'MIDDLE EAST' 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 = 'MIDDLE EAST' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=828501.57..828501.57 rows=1 width=190) (actual time=8865.429..8865.460 rows=100 loops=1) Buffers: shared hit=1760670 read=114780 written=134 -> Sort (cost=828501.57..828501.57 rows=1 width=190) (actual time=8865.426..8865.447 rows=100 loops=1) Sort Key: public.supplier.s_acctbal, public.nation.n_name, public.supplier.s_name, part.p_partkey Sort Method: top-N heapsort Memory: 51kB Buffers: shared hit=1760670 read=114780 written=134 -> Merge Join (cost=395548.83..828501.56 rows=1 width=190) (actual time=5710.851..8858.924 rows=4694 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1603 Buffers: shared hit=1760662 read=114780 written=134 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8082 width=30) (actual time=0.032..1428.374 rows=7859 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 8)) Rows Removed by Filter: 1992141 Buffers: shared hit=758 read=45983 written=123 -> Sort (cost=395548.83..399548.83 rows=1600000 width=168) (actual time=5709.900..6270.142 rows=1603268 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475045kB Buffers: shared hit=1605371 read=64908 -> Nested Loop (cost=1.56..230671.71 rows=1600000 width=168) (actual time=0.065..3991.631 rows=1603360 loops=1) Buffers: shared hit=1605371 read=64908 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.050..115.708 rows=20042 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79958 Buffers: shared hit=2181 -> 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 = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.038..99.786 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=2180 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.007..38.266 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.016..0.016 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 2kB Buffers: shared hit=1 -> 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 -> Index Scan using partsupp_ps_suppkey_idx on partsupp (cost=0.00..10.44 rows=80 width=12) (actual time=0.015..0.175 rows=80 loops=20042) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1603190 read=64908 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.067..0.067 rows=1 loops=6297) Buffers: shared hit=154533 read=3889 written=11 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.044..0.064 rows=2 loops=6297) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=154533 read=3889 written=11 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.003..0.003 rows=1 loops=6297) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6297 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.028..0.060 rows=4 loops=6297) Buffers: shared hit=148236 read=3889 written=11 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.025..0.049 rows=4 loops=6297) Buffers: shared hit=97860 read=3889 written=11 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.017..0.019 rows=4 loops=6297) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22143 read=3889 written=11 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=25188) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75717 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.002..0.002 rows=1 loops=25188) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50376 Total runtime: 8927.600 ms (67 rows) COMMIT; COMMIT