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 = 'BRAZIL' and n2.n_name = 'SAUDI ARABIA') or (n1.n_name = 'SAUDI ARABIA' and n2.n_name = 'BRAZIL') ) 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=2366076.92..2367983.40 rows=58661 width=64) (actual time=120008.177..120032.299 rows=4 loops=1) Buffers: shared hit=661044 read=774906 written=18060 -> Sort (cost=2366076.92..2366223.57 rows=58661 width=64) (actual time=120000.054..120003.779 rows=58090 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: 9705kB Buffers: shared hit=661044 read=774906 written=18060 -> Hash Join (cost=898519.10..2361430.94 rows=58661 width=64) (actual time=58457.399..119596.585 rows=58090 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=661036 read=774906 written=18060 -> Hash Join (cost=893840.10..2326531.98 rows=1467002 width=72) (actual time=58307.376..115894.772 rows=1455094 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=658854 read=774906 written=18060 -> Bitmap Heap Scan on lineitem (cost=387812.94..1737014.03 rows=18352206 width=20) (actual time=20673.871..55619.964 rows=18247062 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=372770 read=747359 written=18059 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383224.89 rows=18352206 width=0) (actual time=19880.804..19880.804 rows=18374583 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=7 read=49808 written=106 -> Hash (cost=490919.26..490919.26 rows=1208632 width=60) (actual time=37632.721..37632.721 rows=1197181 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107560kB Buffers: shared hit=286084 read=27547 written=1 -> Hash Join (cost=15638.06..490919.26 rows=1208632 width=60) (actual time=2179.727..36762.963 rows=1197181 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=286084 read=27547 written=1 -> Seq Scan on orders (cost=0.00..406494.91 rows=15119991 width=8) (actual time=0.022..7435.384 rows=15015000 loops=1) Buffers: shared hit=251608 read=3687 written=1 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=2179.588..2179.588 rows=119755 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10760kB Buffers: shared hit=34476 read=23860 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=51.243..2062.839 rows=119755 loops=1) Buffers: shared hit=34476 read=23860 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.115..0.487 rows=2 loops=1) Join Filter: (((n1.n_name = 'BRAZIL'::bpchar) AND (n2.n_name = 'SAUDI ARABIA'::bpchar)) OR ((n1.n_name = 'SAUDI ARABIA'::bpchar) AND (n2.n_name = 'BRAZIL'::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..0.051 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..0.010 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=48.004..1007.335 rows=59878 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=34473 read=23860 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=38.075..38.075 rows=59878 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=149.292..149.292 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..106.273 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 120065.643 ms (53 rows) COMMIT; COMMIT