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 = 12 and p_type like '%TIN' 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=824212.58..824212.58 rows=1 width=190) (actual time=17476.733..17476.767 rows=100 loops=1) Buffers: shared hit=1636728 read=240911 written=14827 -> Sort (cost=824212.58..824212.58 rows=1 width=190) (actual time=17476.729..17476.750 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=1636728 read=240911 written=14827 -> Merge Join (cost=395548.99..824212.57 rows=1 width=190) (actual time=11729.315..17465.073 rows=4765 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1643 Buffers: shared hit=1636720 read=240911 written=14827 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7977 width=30) (actual time=0.090..3130.034 rows=7965 loops=1) Filter: (((p_type)::text ~~ '%TIN'::text) AND (p_size = 12)) Rows Removed by Filter: 1992035 Buffers: shared hit=757 read=45984 written=106 -> Sort (cost=395548.99..399548.99 rows=1600000 width=168) (actual time=11728.736..12492.108 rows=1602914 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1480312 read=189370 written=14703 -> Nested Loop (cost=1.56..230671.86 rows=1600000 width=168) (actual time=0.120..9068.895 rows=1602960 loops=1) Buffers: shared hit=1480312 read=189370 written=14703 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.068..227.278 rows=20037 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79963 Buffers: shared hit=35 read=2146 written=392 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.017 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=0.048..202.339 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=34 read=2146 written=392 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.011..91.875 rows=100000 loops=1) Buffers: shared hit=33 read=2146 written=392 -> 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: 2kB Buffers: shared hit=1 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.004..0.010 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=0.031..0.412 rows=80 loops=20037) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1480277 read=187224 written=14311 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.143..0.143 rows=1 loops=6408) Buffers: shared hit=155651 read=5557 written=18 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.096..0.138 rows=2 loops=6408) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155651 read=5557 written=18 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.007 rows=1 loops=6408) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6408 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.061..0.128 rows=4 loops=6408) Buffers: shared hit=149243 read=5557 written=18 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.052..0.102 rows=4 loops=6408) Buffers: shared hit=97979 read=5557 written=18 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.034..0.037 rows=4 loops=6408) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22033 read=4439 written=7 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.014..0.014 rows=1 loops=25632) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75946 read=1118 written=11 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=25632) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51264 Total runtime: 17577.616 ms (67 rows) COMMIT; COMMIT