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 = 'INDONESIA') or (n1.n_name = 'INDONESIA' 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=2365112.36..2367015.00 rows=58543 width=64) (actual time=77594.035..77617.868 rows=4 loops=1) Buffers: shared hit=562350 read=873766 written=29772 -> Sort (cost=2365112.36..2365258.71 rows=58543 width=64) (actual time=77585.404..77590.389 rows=58295 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: 9734kB Buffers: shared hit=562350 read=873766 written=29772 -> Hash Join (cost=898041.08..2360476.57 rows=58543 width=64) (actual time=41022.444..77254.195 rows=58295 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=562342 read=873766 written=29772 -> Hash Join (cost=893362.08..2325615.26 rows=1465208 width=72) (actual time=40942.662..74119.547 rows=1454950 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=560160 read=873766 written=29772 -> Bitmap Heap Scan on lineitem (cost=387334.92..1736199.40 rows=18329765 width=20) (actual time=14890.316..29607.434 rows=18247062 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=266368 read=853761 written=29772 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382752.48 rows=18329765 width=0) (actual time=14193.540..14193.540 rows=18374583 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=7126 read=42689 written=1618 -> Hash (cost=490919.26..490919.26 rows=1208632 width=60) (actual time=26051.450..26051.450 rows=1199410 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107760kB Buffers: shared hit=293792 read=20005 -> Hash Join (cost=15638.06..490919.26 rows=1208632 width=60) (actual time=391.712..24916.088 rows=1199410 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=293792 read=20005 -> Seq Scan on orders (cost=0.00..406494.91 rows=15119991 width=8) (actual time=0.020..4255.155 rows=15015000 loops=1) Buffers: shared hit=235624 read=19671 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=391.561..391.561 rows=120039 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10785kB Buffers: shared hit=58168 read=334 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=18.917..337.780 rows=120039 loops=1) Buffers: shared hit=58168 read=334 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.172..0.350 rows=2 loops=1) Join Filter: (((n1.n_name = 'SAUDI ARABIA'::bpchar) AND (n2.n_name = 'INDONESIA'::bpchar)) OR ((n1.n_name = 'INDONESIA'::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=0.024..0.041 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.003 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.006..0.011 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=20.355..156.355 rows=60020 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58165 read=334 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.815..13.815 rows=60020 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=334 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=78.964..78.964 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=0.011..50.978 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 77646.009 ms (53 rows) COMMIT; COMMIT