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 = 'CANADA' and n2.n_name = 'RUSSIA') or (n1.n_name = 'RUSSIA' and n2.n_name = 'CANADA') ) 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=2370330.46..2372240.71 rows=58777 width=64) (actual time=127406.228..127433.605 rows=4 loops=1) Buffers: shared hit=1015670 read=422995 dirtied=1061 written=12472 -> Sort (cost=2370330.46..2370477.40 rows=58777 width=64) (actual time=127395.851..127401.819 rows=58562 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=1015670 read=422995 dirtied=1061 written=12472 -> Hash Join (cost=899863.80..2365674.45 rows=58777 width=64) (actual time=55408.409..127062.722 rows=58562 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1015662 read=422995 dirtied=1061 written=12472 -> Hash Join (cost=895184.80..2330715.61 rows=1469909 width=72) (actual time=55244.271..122959.608 rows=1450549 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1013480 read=422995 dirtied=1061 written=12472 -> Bitmap Heap Scan on lineitem (cost=388185.69..1740060.27 rows=18388572 width=20) (actual time=15704.695..59089.440 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=716735 read=405514 dirtied=1061 written=12467 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383588.55 rows=18388572 width=0) (actual time=14551.350..14551.350 rows=18410988 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 written=10 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=39538.641..39538.641 rows=1198119 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107644kB Buffers: shared hit=296745 read=17481 written=5 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=561.769..38278.526 rows=1198119 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=296745 read=17481 written=5 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.014..8441.174 rows=15015000 loops=1) Buffers: shared hit=239816 read=15985 written=5 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=561.632..561.632 rows=119914 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10774kB Buffers: shared hit=56929 read=1496 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=53.547..478.869 rows=119914 loops=1) Buffers: shared hit=56929 read=1496 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.101..0.413 rows=2 loops=1) Join Filter: (((n1.n_name = 'CANADA'::bpchar) AND (n2.n_name = 'RUSSIA'::bpchar)) OR ((n1.n_name = 'RUSSIA'::bpchar) AND (n2.n_name = 'CANADA'::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=0.016..0.038 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=0.004..0.007 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=40.369..220.513 rows=59957 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=56926 read=1496 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=29.021..29.021 rows=59957 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=332 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=163.691..163.691 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=0.018..109.152 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 127470.165 ms (53 rows) COMMIT; COMMIT