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 = 'UNITED STATES') or (n1.n_name = 'UNITED STATES' 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=2360567.36..2362472.15 rows=58609 width=64) (actual time=80275.636..80305.197 rows=4 loops=1) Buffers: shared hit=1062879 read=368044 written=9262 -> Sort (cost=2360567.36..2360713.88 rows=58609 width=64) (actual time=80264.990..80272.539 rows=59525 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: 9907kB Buffers: shared hit=1062879 read=368044 written=9262 -> Hash Join (cost=897315.65..2355925.87 rows=58609 width=64) (actual time=42395.790..79950.760 rows=59525 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1062871 read=368044 written=9262 -> Hash Join (cost=892636.65..2321031.39 rows=1466817 width=72) (actual time=42325.180..76948.197 rows=1470192 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1060976 read=367757 written=9262 -> Bitmap Heap Scan on lineitem (cost=388557.27..1733471.73 rows=18349897 width=20) (actual time=14525.913..28198.398 rows=18247629 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=762543 read=353348 written=9014 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383969.80 rows=18349897 width=0) (actual time=13861.065..13861.065 rows=18302308 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=6124 read=43691 written=11 -> Hash (cost=489031.49..489031.49 rows=1203831 width=60) (actual time=27798.355..27798.355 rows=1206939 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108436kB Buffers: shared hit=298433 read=14409 written=248 -> Hash Join (cost=15638.06..489031.49 rows=1203831 width=60) (actual time=421.529..26316.550 rows=1206939 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=298433 read=14409 written=248 -> Seq Scan on orders (cost=0.00..404880.36 rows=15059936 width=8) (actual time=0.031..4583.016 rows=15015000 loops=1) Buffers: shared hit=240205 read=14076 written=248 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=421.338..421.338 rows=120062 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10787kB Buffers: shared hit=58228 read=333 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=30.967..365.617 rows=120062 loops=1) Buffers: shared hit=58228 read=333 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.179..0.321 rows=2 loops=1) Join Filter: (((n1.n_name = 'IRAQ'::bpchar) AND (n2.n_name = 'UNITED STATES'::bpchar)) OR ((n1.n_name = 'UNITED STATES'::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..0.039 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=25.437..169.357 rows=60031 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58225 read=333 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=16.255..16.255 rows=60031 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=333 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=68.662..68.662 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=1892 read=287 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.009..40.848 rows=100000 loops=1) Buffers: shared hit=1892 read=287 Total runtime: 80344.149 ms (53 rows) COMMIT; COMMIT