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 = 'SAUDI ARABIA' and n2.n_name = 'INDIA') or (n1.n_name = 'INDIA' and n2.n_name = 'SAUDI ARABIA') ) 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=2362711.84..2364618.55 rows=58668 width=64) (actual time=80307.375..80340.563 rows=4 loops=1) Buffers: shared hit=735518 read=696559 dirtied=253 written=5482 -> Sort (cost=2362711.84..2362858.51 rows=58668 width=64) (actual time=80295.674..80306.291 rows=59059 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: 9842kB Buffers: shared hit=735518 read=696559 dirtied=253 written=5482 -> Hash Join (cost=897990.49..2358065.25 rows=58668 width=64) (actual time=41000.060..79961.527 rows=59059 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=735510 read=696559 dirtied=253 written=5482 -> Hash Join (cost=893311.49..2323140.43 rows=1468290 width=72) (actual time=40923.648..76629.070 rows=1456815 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=733328 read=696559 dirtied=253 written=5482 -> Bitmap Heap Scan on lineitem (cost=388746.13..1735010.96 rows=18368322 width=20) (actual time=15101.528..30799.999 rows=18247443 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=465485 read=651475 written=5353 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384154.05 rows=18368322 width=0) (actual time=14384.655..14384.655 rows=18320255 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=2326 read=47489 written=2628 -> Hash (cost=489502.50..489502.50 rows=1205029 width=60) (actual time=25821.123..25821.123 rows=1196978 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107541kB Buffers: shared hit=267843 read=45084 dirtied=253 written=129 -> Hash Join (cost=15638.06..489502.50 rows=1205029 width=60) (actual time=930.960..24927.960 rows=1196978 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=267843 read=45084 dirtied=253 written=129 -> Seq Scan on orders (cost=0.00..405283.20 rows=15074920 width=8) (actual time=0.022..4572.678 rows=15015000 loops=1) Buffers: shared hit=244077 read=10457 dirtied=253 written=2 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=930.794..930.794 rows=120018 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10783kB Buffers: shared hit=23766 read=34627 written=127 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=19.485..840.052 rows=120018 loops=1) Buffers: shared hit=23766 read=34627 written=127 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.164..0.425 rows=2 loops=1) Join Filter: (((n1.n_name = 'SAUDI ARABIA'::bpchar) AND (n2.n_name = 'INDIA'::bpchar)) OR ((n1.n_name = 'INDIA'::bpchar) AND (n2.n_name = 'SAUDI ARABIA'::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=0.025..0.048 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..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=24.897..397.996 rows=60009 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23763 read=34627 written=127 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=16.771..16.771 rows=60009 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=335 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=75.076..75.076 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=0.008..45.965 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 80386.495 ms (53 rows) COMMIT; COMMIT