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 = 'ARGENTINA' and n2.n_name = 'CANADA') or (n1.n_name = 'CANADA' and n2.n_name = 'ARGENTINA') ) 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=2351511.06..2353398.79 rows=58084 width=64) (actual time=154691.820..154717.852 rows=4 loops=1) Buffers: shared hit=1250846 read=178443 dirtied=100 written=1140 -> Sort (cost=2351511.06..2351656.27 rows=58084 width=64) (actual time=154683.113..154687.393 rows=58319 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: 9738kB Buffers: shared hit=1250846 read=178443 dirtied=100 written=1140 -> Hash Join (cost=893195.71..2346914.92 rows=58084 width=64) (actual time=77145.897..154306.886 rows=58319 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1250838 read=178443 dirtied=100 written=1140 -> Hash Join (cost=888516.71..2312317.48 rows=1452359 width=72) (actual time=76973.080..149831.552 rows=1452444 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1248656 read=178443 dirtied=100 written=1140 -> Bitmap Heap Scan on lineitem (cost=384923.31..1726066.66 rows=18169023 width=20) (actual time=20312.081..67561.822 rows=18248203 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=1012579 read=102259 written=22 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..380381.06 rows=18169023 width=0) (actual time=19547.855..19547.855 rows=18284460 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=3909 read=45906 -> Hash (cost=488560.48..488560.48 rows=1202633 width=60) (actual time=56659.887..56659.887 rows=1195863 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107441kB Buffers: shared hit=236077 read=76184 dirtied=100 written=1118 -> Hash Join (cost=15638.06..488560.48 rows=1202633 width=60) (actual time=3798.107..55145.801 rows=1195863 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=236077 read=76184 dirtied=100 written=1118 -> Seq Scan on orders (cost=0.00..404477.52 rows=15044952 width=8) (actual time=0.020..15918.942 rows=15015000 loops=1) Buffers: shared hit=212378 read=41650 dirtied=100 written=1118 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=3797.920..3797.920 rows=119690 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10754kB Buffers: shared hit=23699 read=34534 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=42.604..3677.725 rows=119690 loops=1) Buffers: shared hit=23699 read=34534 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.096..0.364 rows=2 loops=1) Join Filter: (((n1.n_name = 'ARGENTINA'::bpchar) AND (n2.n_name = 'CANADA'::bpchar)) OR ((n1.n_name = 'CANADA'::bpchar) AND (n2.n_name = 'ARGENTINA'::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=0.023..0.043 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=0.006..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=41.952..1812.215 rows=59845 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23696 read=34534 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=32.320..32.320 rows=59845 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=333 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=168.272..168.272 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=0.020..120.101 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 154745.227 ms (53 rows) COMMIT; COMMIT