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 = 'IRAN' and n2.n_name = 'JAPAN') or (n1.n_name = 'JAPAN' and n2.n_name = 'IRAN') ) 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=2366366.58..2368267.48 rows=58489 width=64) (actual time=173722.128..173754.766 rows=4 loops=1) Buffers: shared hit=722359 read=716349 written=1760 -> Sort (cost=2366366.58..2366512.81 rows=58489 width=64) (actual time=173708.415..173718.697 rows=58527 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: 9767kB Buffers: shared hit=722359 read=716349 written=1760 -> Hash Join (cost=897897.69..2361735.46 rows=58489 width=64) (actual time=71043.298..173372.188 rows=58527 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=722351 read=716349 written=1760 -> Hash Join (cost=893218.69..2326929.77 rows=1462468 width=72) (actual time=70864.175..168824.406 rows=1452565 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=720169 read=716349 written=1760 -> Bitmap Heap Scan on lineitem (cost=386219.58..1736697.90 rows=18295488 width=20) (actual time=20361.343..93272.536 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=443681 read=678568 written=1753 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381645.71 rows=18295488 width=0) (actual time=19732.290..19732.290 rows=18410988 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=733 read=49082 written=1253 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=50501.835..50501.835 rows=1198255 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107656kB Buffers: shared hit=276488 read=37781 written=7 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=4646.203..49408.876 rows=1198255 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=276488 read=37781 written=7 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.019..12935.822 rows=15015000 loops=1) Buffers: shared hit=252640 read=3161 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=4646.035..4646.035 rows=119858 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10769kB Buffers: shared hit=23848 read=34620 written=7 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=41.178..4520.749 rows=119858 loops=1) Buffers: shared hit=23848 read=34620 written=7 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.175..0.370 rows=2 loops=1) Join Filter: (((n1.n_name = 'IRAN'::bpchar) AND (n2.n_name = 'JAPAN'::bpchar)) OR ((n1.n_name = 'JAPAN'::bpchar) AND (n2.n_name = 'IRAN'::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=0.022..0.037 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=0.006..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=56.992..2233.421 rows=59929 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23845 read=34620 written=7 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=47.260..47.260 rows=59929 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=177.407..177.407 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=0.016..131.719 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 173784.179 ms (53 rows) COMMIT; COMMIT