BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select supp_nation, cust_nation, l_year, sum(volume) as revenue from ( select n1.n_name as supp_nation, n2.n_name as cust_nation, extract(year from l_shipdate) as l_year, l_extendedprice * (1 - l_discount) as volume from supplier, lineitem, orders, customer, nation n1, nation n2 where s_suppkey = l_suppkey and o_orderkey = l_orderkey and c_custkey = o_custkey and s_nationkey = n1.n_nationkey and c_nationkey = n2.n_nationkey and ( (n1.n_name = 'SAUDI ARABIA' and n2.n_name = 'KENYA') or (n1.n_name = 'KENYA' and n2.n_name = 'SAUDI ARABIA') ) and l_shipdate between date '1995-01-01' and date '1996-12-31' ) as shipping group by supp_nation, cust_nation, l_year order by supp_nation, cust_nation, l_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- GroupAggregate (cost=2368194.46..2370102.83 rows=58719 width=64) (actual time=117703.940..117734.499 rows=4 loops=1) Buffers: shared hit=769217 read=668041 written=8282 -> Sort (cost=2368194.46..2368341.26 rows=58719 width=64) (actual time=117693.421..117702.495 rows=58575 loops=1) Sort Key: n1.n_name, n2.n_name, (date_part('year'::text, (lineitem.l_shipdate)::timestamp without time zone)) Sort Method: quicksort Memory: 9774kB Buffers: shared hit=769217 read=668041 written=8282 -> Hash Join (cost=899190.39..2363543.47 rows=58719 width=64) (actual time=55292.613..117276.345 rows=58575 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=769209 read=668041 written=8282 -> Hash Join (cost=894511.39..2328614.74 rows=1468447 width=72) (actual time=55141.236..113343.829 rows=1452505 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=767027 read=668041 written=8282 -> Bitmap Heap Scan on lineitem (cost=387998.27..1738528.58 rows=18370287 width=20) (actual time=18122.152..52479.346 rows=18246580 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=484575 read=636608 written=8258 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383405.70 rows=18370287 width=0) (actual time=17435.114..17435.114 rows=18392702 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=3 read=49812 written=46 -> Hash (cost=491390.26..491390.26 rows=1209829 width=60) (actual time=37018.196..37018.196 rows=1193548 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107233kB Buffers: shared hit=282452 read=31433 written=24 -> Hash Join (cost=15638.06..491390.26 rows=1209829 width=60) (actual time=2352.813..35965.705 rows=1193548 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=282452 read=31433 written=24 -> Seq Scan on orders (cost=0.00..406897.75 rows=15134975 width=8) (actual time=0.017..7329.957 rows=15015000 loops=1) Buffers: shared hit=253436 read=2112 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=2352.664..2352.664 rows=119279 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10717kB Buffers: shared hit=29016 read=29321 written=24 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=29.962..2240.476 rows=119279 loops=1) Buffers: shared hit=29016 read=29321 written=24 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.190..0.386 rows=2 loops=1) Join Filter: (((n1.n_name = 'SAUDI ARABIA'::bpchar) AND (n2.n_name = 'KENYA'::bpchar)) OR ((n1.n_name = 'KENYA'::bpchar) AND (n2.n_name = 'SAUDI ARABIA'::bpchar))) Rows Removed by Join Filter: 623 Buffers: shared hit=3 -> Index Scan using pk_nation on nation n1 (cost=0.00..12.63 rows=25 width=30) (actual time=0.012..0.036 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.004 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.004..0.007 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=35.893..1095.037 rows=59640 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=29013 read=29321 written=24 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=26.753..26.753 rows=59640 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=332 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=149.722..149.722 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2179 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.009..103.494 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 117763.666 ms (53 rows) COMMIT; COMMIT