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 = 'PERU' and n2.n_name = 'IRAQ') or (n1.n_name = 'IRAQ' and n2.n_name = 'PERU') ) 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=2357572.08..2359470.99 rows=58428 width=64) (actual time=134017.909..134045.910 rows=4 loops=1) Buffers: shared hit=971928 read=458807 written=13182 -> Sort (cost=2357572.08..2357718.15 rows=58428 width=64) (actual time=134008.228..134013.495 rows=59124 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: 9851kB Buffers: shared hit=971928 read=458807 written=13182 -> Hash Join (cost=895826.53..2352946.22 rows=58428 width=64) (actual time=63834.829..133636.360 rows=59124 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=971920 read=458807 written=13182 -> Hash Join (cost=891147.53..2318166.92 rows=1461194 width=72) (actual time=63667.407..129896.722 rows=1460375 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=969738 read=458807 written=13182 -> Bitmap Heap Scan on lineitem (cost=387068.16..1730927.32 rows=18279544 width=20) (actual time=19945.240..59722.100 rows=18247629 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=657249 read=458642 written=13182 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382498.27 rows=18279544 width=0) (actual time=19080.111..19080.111 rows=18302308 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=2 read=49813 written=6 -> Hash (cost=489031.49..489031.49 rows=1203831 width=60) (actual time=43721.379..43721.379 rows=1199915 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107805kB Buffers: shared hit=312489 read=165 -> Hash Join (cost=15638.06..489031.49 rows=1203831 width=60) (actual time=1411.715..42667.706 rows=1199915 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=312489 read=165 -> Seq Scan on orders (cost=0.00..404880.36 rows=15059936 width=8) (actual time=0.017..9593.018 rows=15015000 loops=1) Buffers: shared hit=254281 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1411.584..1411.584 rows=119844 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10768kB Buffers: shared hit=58208 read=165 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=39.825..1295.561 rows=119844 loops=1) Buffers: shared hit=58208 read=165 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.187..0.378 rows=2 loops=1) Join Filter: (((n1.n_name = 'PERU'::bpchar) AND (n2.n_name = 'IRAQ'::bpchar)) OR ((n1.n_name = 'IRAQ'::bpchar) AND (n2.n_name = 'PERU'::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=0.024..0.042 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=0.007..0.012 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=34.417..625.023 rows=59922 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58205 read=165 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=24.872..24.872 rows=59922 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=169 read=165 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=165.384..165.384 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=0.014..116.398 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 134091.446 ms (53 rows) COMMIT; COMMIT