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 = 'IRAQ' and n2.n_name = 'ALGERIA') or (n1.n_name = 'ALGERIA' and n2.n_name = 'IRAQ') ) 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=2381358.40..2383281.75 rows=59180 width=64) (actual time=103613.937..103641.276 rows=4 loops=1) Buffers: shared hit=1058536 read=385938 written=4709 -> Sort (cost=2381358.40..2381506.35 rows=59180 width=64) (actual time=103604.383..103609.536 rows=58773 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: 9801kB Buffers: shared hit=1058536 read=385938 written=4709 -> Hash Join (cost=903433.84..2376667.55 rows=59180 width=64) (actual time=55897.448..103313.312 rows=58773 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1058528 read=385938 written=4709 -> Hash Join (cost=898754.84..2341510.81 rows=1479502 width=72) (actual time=55735.920..99822.724 rows=1464131 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1056346 read=385938 written=4709 -> Bitmap Heap Scan on lineitem (cost=389811.82..1748365.58 rows=18508584 width=20) (actual time=18644.379..38043.538 rows=18228553 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=763239 read=363875 written=4709 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..385184.67 rows=18508584 width=0) (actual time=17549.279..17549.279 rows=18501822 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=5799 read=44016 written=4655 -> Hash (cost=493745.30..493745.30 rows=1215818 width=60) (actual time=37090.653..37090.653 rows=1202561 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108043kB Buffers: shared hit=293107 read=22063 -> Hash Join (cost=15638.06..493745.30 rows=1215818 width=60) (actual time=1669.657..34486.362 rows=1202561 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=293107 read=22063 -> Seq Scan on orders (cost=0.00..408911.95 rows=15209895 width=8) (actual time=0.035..6773.706 rows=15000000 loops=1) Buffers: shared hit=250074 read=6739 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1669.513..1669.513 rows=119972 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10779kB Buffers: shared hit=43033 read=15324 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=29.604..1556.406 rows=119972 loops=1) Buffers: shared hit=43033 read=15324 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.085..0.542 rows=2 loops=1) Join Filter: (((n1.n_name = 'IRAQ'::bpchar) AND (n2.n_name = 'ALGERIA'::bpchar)) OR ((n1.n_name = 'ALGERIA'::bpchar) AND (n2.n_name = 'IRAQ'::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..0.053 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=0.006..0.017 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=33.071..752.409 rows=59986 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=43030 read=15324 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=25.452..25.452 rows=59986 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=161.149..161.149 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=0.019..110.707 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 103679.722 ms (53 rows) COMMIT; COMMIT