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 = 'INDONESIA' and n2.n_name = 'CANADA') or (n1.n_name = 'CANADA' and n2.n_name = 'INDONESIA') ) 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=2378863.73..2380781.55 rows=59010 width=64) (actual time=129527.662..129576.602 rows=4 loops=1) Buffers: shared hit=999234 read=444821 written=11530 -> Sort (cost=2378863.73..2379011.25 rows=59010 width=64) (actual time=129508.738..129524.711 rows=58388 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: 9747kB Buffers: shared hit=999234 read=444821 written=11530 -> Hash Join (cost=902556.18..2374187.58 rows=59010 width=64) (actual time=71890.868..129022.331 rows=58388 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=999226 read=444821 written=11530 -> Hash Join (cost=897877.18..2339108.51 rows=1475746 width=72) (actual time=71733.339..125543.162 rows=1452492 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=997044 read=444821 written=11530 -> Bitmap Heap Scan on lineitem (cost=388934.16..1746177.05 rows=18461593 width=20) (actual time=19563.391..49515.544 rows=18246268 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=865160 read=261350 written=11505 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384318.76 rows=18461593 width=0) (actual time=18808.294..18808.294 rows=18484985 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=493745.30..493745.30 rows=1215818 width=60) (actual time=52168.238..52168.238 rows=1200018 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107815kB Buffers: shared hit=131884 read=183471 written=25 -> Hash Join (cost=15638.06..493745.30 rows=1215818 width=60) (actual time=2703.858..50333.836 rows=1200018 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=131884 read=183471 written=25 -> Seq Scan on orders (cost=0.00..408911.95 rows=15209895 width=8) (actual time=0.061..13787.877 rows=15015000 loops=1) Buffers: shared hit=107953 read=148860 written=25 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=2703.611..2703.611 rows=120085 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10789kB Buffers: shared hit=23931 read=34611 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=41.888..2444.173 rows=120085 loops=1) Buffers: shared hit=23931 read=34611 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.104..0.449 rows=2 loops=1) Join Filter: (((n1.n_name = 'INDONESIA'::bpchar) AND (n2.n_name = 'CANADA'::bpchar)) OR ((n1.n_name = 'CANADA'::bpchar) AND (n2.n_name = 'INDONESIA'::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..0.034 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..0.010 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=36.841..1196.610 rows=60042 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23928 read=34611 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=26.686..26.686 rows=60042 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=156.650..156.650 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=0.016..109.709 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 129610.949 ms (53 rows) COMMIT; COMMIT