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 = 'JAPAN' and n2.n_name = 'FRANCE') or (n1.n_name = 'FRANCE' and n2.n_name = 'JAPAN') ) 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=2376747.81..2378663.79 rows=58953 width=64) (actual time=116641.571..116678.271 rows=4 loops=1) Buffers: shared hit=492202 read=950457 dirtied=253 written=14778 -> Sort (cost=2376747.81..2376895.20 rows=58953 width=64) (actual time=116629.437..116641.227 rows=58567 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: 9772kB Buffers: shared hit=492202 read=950457 dirtied=253 written=14778 -> Hash Join (cost=901885.05..2372076.59 rows=58953 width=64) (actual time=62412.930..116326.454 rows=58567 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=492194 read=950457 dirtied=253 written=14778 -> Hash Join (cost=897206.05..2337027.26 rows=1474302 width=72) (actual time=62295.073..112279.259 rows=1459698 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=490012 read=950457 dirtied=253 written=14778 -> Bitmap Heap Scan on lineitem (cost=388749.01..1744663.96 rows=18443530 width=20) (actual time=17275.251..45402.559 rows=18246498 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=239560 read=885895 written=14772 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384138.13 rows=18443530 width=0) (actual time=16624.278..16624.278 rows=18466690 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=3 read=49812 written=51 -> Hash (cost=493274.29..493274.29 rows=1214620 width=60) (actual time=45018.778..45018.778 rows=1204954 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108258kB Buffers: shared hit=250452 read=64562 dirtied=253 written=6 -> Hash Join (cost=15638.06..493274.29 rows=1214620 width=60) (actual time=3068.786..42602.838 rows=1204954 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=250452 read=64562 dirtied=253 written=6 -> Seq Scan on orders (cost=0.00..408509.11 rows=15194911 width=8) (actual time=0.043..10264.949 rows=15015000 loops=1) Buffers: shared hit=226637 read=29923 dirtied=253 written=6 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=3068.591..3068.591 rows=120073 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10788kB Buffers: shared hit=23815 read=34639 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=36.113..2948.462 rows=120073 loops=1) Buffers: shared hit=23815 read=34639 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.151..0.480 rows=2 loops=1) Join Filter: (((n1.n_name = 'JAPAN'::bpchar) AND (n2.n_name = 'FRANCE'::bpchar)) OR ((n1.n_name = 'FRANCE'::bpchar) AND (n2.n_name = 'JAPAN'::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=0.021..0.045 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=0.008..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=38.167..1448.784 rows=60036 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23812 read=34639 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=26.743..26.743 rows=60036 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=117.187..117.187 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..73.108 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 116713.627 ms (53 rows) COMMIT; COMMIT