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 = 'FRANCE' and n2.n_name = 'INDIA') or (n1.n_name = 'INDIA' and n2.n_name = 'FRANCE') ) 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=2353625.75..2355515.36 rows=58142 width=64) (actual time=177145.393..177172.714 rows=4 loops=1) Buffers: shared hit=720528 read=710322 written=18582 -> Sort (cost=2353625.75..2353771.10 rows=58142 width=64) (actual time=177135.504..177140.826 rows=58893 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: 9818kB Buffers: shared hit=720528 read=710322 written=18582 -> Hash Join (cost=893866.08..2349024.60 rows=58142 width=64) (actual time=72425.094..176410.943 rows=58893 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=720520 read=710322 written=18582 -> Hash Join (cost=889187.08..2314397.53 rows=1453797 width=72) (actual time=72258.724..172134.182 rows=1464829 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=718338 read=710322 written=18582 -> Bitmap Heap Scan on lineitem (cost=385107.70..1727578.88 rows=18187012 width=20) (actual time=20162.105..92383.853 rows=18247629 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=436327 read=679564 written=18570 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..380560.95 rows=18187012 width=0) (actual time=19482.172..19482.172 rows=18302308 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 written=3 -> Hash (cost=489031.49..489031.49 rows=1203831 width=60) (actual time=52095.682..52095.682 rows=1206283 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108377kB Buffers: shared hit=282011 read=30758 written=12 -> Hash Join (cost=15638.06..489031.49 rows=1203831 width=60) (actual time=2589.874..50351.620 rows=1206283 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=282011 read=30758 written=12 -> Seq Scan on orders (cost=0.00..404880.36 rows=15059936 width=8) (actual time=0.019..13244.435 rows=15015000 loops=1) Buffers: shared hit=237776 read=16505 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=2589.727..2589.727 rows=120531 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10829kB Buffers: shared hit=44235 read=14253 written=12 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=46.132..2486.041 rows=120531 loops=1) Buffers: shared hit=44235 read=14253 written=12 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.698..1.020 rows=2 loops=1) Join Filter: (((n1.n_name = 'FRANCE'::bpchar) AND (n2.n_name = 'INDIA'::bpchar)) OR ((n1.n_name = 'INDIA'::bpchar) AND (n2.n_name = 'FRANCE'::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=0.238..0.265 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.005 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..0.012 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=41.892..1217.198 rows=60266 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=44232 read=14253 written=12 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=32.617..32.617 rows=60266 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=336 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=161.418..161.418 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=0.017..109.772 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 177216.627 ms (53 rows) COMMIT; COMMIT