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 = 'INDIA' and n2.n_name = 'BRAZIL') or (n1.n_name = 'BRAZIL' and n2.n_name = 'INDIA') ) 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=2361831.87..2363734.58 rows=58545 width=64) (actual time=117766.228..117825.636 rows=4 loops=1) Buffers: shared hit=934859 read=498542 written=2985 -> Sort (cost=2361831.87..2361978.23 rows=58545 width=64) (actual time=117748.484..117766.508 rows=59090 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: 9846kB Buffers: shared hit=934859 read=498542 written=2985 -> Hash Join (cost=897171.95..2357195.90 rows=58545 width=64) (actual time=63739.171..117315.180 rows=59090 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=934851 read=498542 written=2985 -> Hash Join (cost=892492.95..2322356.61 rows=1464106 width=72) (actual time=63608.230..113754.413 rows=1464035 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=932669 read=498542 written=2985 -> Bitmap Heap Scan on lineitem (cost=387441.60..1733979.27 rows=18315978 width=20) (actual time=19204.553..45007.531 rows=18247594 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=714455 read=403560 written=2968 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382862.61 rows=18315978 width=0) (actual time=18518.998..18518.998 rows=18338343 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=489973.51..489973.51 rows=1206227 width=60) (actual time=44402.605..44402.605 rows=1202947 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108078kB Buffers: shared hit=218214 read=94982 written=17 -> Hash Join (cost=15638.06..489973.51 rows=1206227 width=60) (actual time=2482.216..43379.269 rows=1202947 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=218214 read=94982 written=17 -> Seq Scan on orders (cost=0.00..405686.04 rows=15089904 width=8) (actual time=0.018..9982.839 rows=15015000 loops=1) Buffers: shared hit=194067 read=60720 written=17 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=2482.056..2482.056 rows=120167 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10797kB Buffers: shared hit=24147 read=34262 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=22.116..2359.292 rows=120167 loops=1) Buffers: shared hit=24147 read=34262 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.105..0.386 rows=2 loops=1) Join Filter: (((n1.n_name = 'INDIA'::bpchar) AND (n2.n_name = 'BRAZIL'::bpchar)) OR ((n1.n_name = 'BRAZIL'::bpchar) AND (n2.n_name = 'INDIA'::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=0.022..0.043 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.004 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..0.008 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=27.733..1153.152 rows=60084 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=24144 read=34262 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=19.130..19.130 rows=60084 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=129.591..129.591 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..81.442 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 117876.905 ms (53 rows) COMMIT; COMMIT