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 = 'MOZAMBIQUE' and n2.n_name = 'IRAN') or (n1.n_name = 'IRAN' and n2.n_name = 'MOZAMBIQUE') ) 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=2351193.34..2353086.59 rows=58254 width=64) (actual time=48416.122..48437.688 rows=4 loops=1) Buffers: shared hit=338045 read=1088870 -> Sort (cost=2351193.34..2351338.97 rows=58254 width=64) (actual time=48408.735..48411.934 rows=57747 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: 9657kB Buffers: shared hit=338045 read=1088870 -> Hash Join (cost=893809.66..2346582.51 rows=58254 width=64) (actual time=15145.374..48188.451 rows=57747 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=338037 read=1088870 -> Hash Join (cost=889130.66..2311893.00 rows=1456835 width=72) (actual time=15087.978..45080.051 rows=1454698 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=335855 read=1088870 -> Bitmap Heap Scan on lineitem (cost=386509.21..1726359.41 rows=18225013 width=20) (actual time=5915.156..18660.826 rows=18248249 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=24021 read=1088690 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381952.96 rows=18225013 width=0) (actual time=5537.675..5537.675 rows=18248249 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=487618.47..487618.47 rows=1200238 width=60) (actual time=9171.815..9171.815 rows=1196913 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107536kB Buffers: shared hit=311834 read=180 -> Hash Join (cost=15638.06..487618.47 rows=1200238 width=60) (actual time=322.755..8751.225 rows=1196913 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=311834 read=180 -> Seq Scan on orders (cost=0.00..403671.84 rows=15014984 width=8) (actual time=0.015..2932.229 rows=15015000 loops=1) Buffers: shared hit=253510 read=12 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=322.606..322.606 rows=119897 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10772kB Buffers: shared hit=58324 read=168 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=17.081..287.742 rows=119897 loops=1) Buffers: shared hit=58324 read=168 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.157..0.317 rows=2 loops=1) Join Filter: (((n1.n_name = 'MOZAMBIQUE'::bpchar) AND (n2.n_name = 'IRAN'::bpchar)) OR ((n1.n_name = 'IRAN'::bpchar) AND (n2.n_name = 'MOZAMBIQUE'::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=0.017..0.033 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=0.007..0.008 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=15.923..133.298 rows=59948 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58321 read=168 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=10.268..10.268 rows=59948 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=170 read=165 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=57.010..57.010 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=0.015..34.601 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 48456.539 ms (53 rows) COMMIT; COMMIT