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 = 'PERU' and n2.n_name = 'IRAN') or (n1.n_name = 'IRAN' and n2.n_name = 'PERU') ) 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=2367736.88..2369641.44 rows=58602 width=64) (actual time=94044.651..94069.320 rows=4 loops=1) Buffers: shared hit=787007 read=651676 written=13372 -> Sort (cost=2367736.88..2367883.38 rows=58602 width=64) (actual time=94035.836..94041.011 rows=58466 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: 9758kB Buffers: shared hit=787007 read=651676 written=13372 -> Hash Join (cost=898575.67..2363095.99 rows=58602 width=64) (actual time=45925.606..93713.869 rows=58466 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=786999 read=651676 written=13372 -> Hash Join (cost=893896.67..2328237.12 rows=1465042 width=72) (actual time=45815.716..89856.670 rows=1447947 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=784817 read=651676 written=13372 -> Bitmap Heap Scan on lineitem (cost=386897.57..1737858.80 rows=18327682 width=20) (actual time=14859.338..36587.352 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=487585 read=634664 written=13364 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382315.65 rows=18327682 width=0) (actual time=14136.861..14136.861 rows=18410988 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=6135 read=43680 written=26 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=30955.676..30955.676 rows=1193467 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107226kB Buffers: shared hit=297232 read=17012 written=8 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=460.654..30149.599 rows=1193467 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=297232 read=17012 written=8 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.016..5361.421 rows=15015000 loops=1) Buffers: shared hit=241020 read=14781 written=8 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=460.508..460.508 rows=119889 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10772kB Buffers: shared hit=56212 read=2231 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=21.107..405.287 rows=119889 loops=1) Buffers: shared hit=56212 read=2231 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.152..0.362 rows=2 loops=1) Join Filter: (((n1.n_name = 'PERU'::bpchar) AND (n2.n_name = 'IRAN'::bpchar)) OR ((n1.n_name = 'IRAN'::bpchar) AND (n2.n_name = 'PERU'::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=0.011..0.024 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..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=20.729..189.630 rows=59944 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=56209 read=2231 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.517..13.517 rows=59944 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=333 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=109.512..109.512 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=0.013..69.272 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 94103.213 ms (53 rows) COMMIT; COMMIT