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 = 'CHINA' and n2.n_name = 'IRAQ') or (n1.n_name = 'IRAQ' and n2.n_name = 'CHINA') ) 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=2352874.37..2354765.78 rows=58197 width=64) (actual time=101930.789..101961.591 rows=4 loops=1) Buffers: shared hit=669872 read=759584 written=8520 -> Sort (cost=2352874.37..2353019.87 rows=58197 width=64) (actual time=101920.205..101927.622 rows=59251 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: 9869kB Buffers: shared hit=669872 read=759584 written=8520 -> Hash Join (cost=893871.42..2348268.47 rows=58197 width=64) (actual time=50192.866..101634.916 rows=59251 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=669864 read=759584 written=8520 -> Hash Join (cost=889192.42..2313618.22 rows=1454915 width=72) (actual time=50030.548..97666.105 rows=1470816 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=668025 read=759241 written=8520 -> Bitmap Heap Scan on lineitem (cost=385599.03..1727221.95 rows=18200995 width=20) (actual time=19187.006..42601.786 rows=18248203 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=382812 read=732026 written=8520 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381048.78 rows=18200995 width=0) (actual time=18332.577..18332.577 rows=18284460 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=5 read=49810 written=48 -> Hash (cost=488560.48..488560.48 rows=1202633 width=60) (actual time=30842.367..30842.367 rows=1207929 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108525kB Buffers: shared hit=285213 read=27215 -> Hash Join (cost=15638.06..488560.48 rows=1202633 width=60) (actual time=801.141..29749.039 rows=1207929 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=285213 read=27215 -> Seq Scan on orders (cost=0.00..404477.52 rows=15044952 width=8) (actual time=0.022..5333.472 rows=15015000 loops=1) Buffers: shared hit=234236 read=19792 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=800.949..800.949 rows=120121 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10793kB Buffers: shared hit=50977 read=7423 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=20.057..606.140 rows=120121 loops=1) Buffers: shared hit=50977 read=7423 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.181..0.417 rows=2 loops=1) Join Filter: (((n1.n_name = 'CHINA'::bpchar) AND (n2.n_name = 'IRAQ'::bpchar)) OR ((n1.n_name = 'IRAQ'::bpchar) AND (n2.n_name = 'CHINA'::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..0.045 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=0.008..0.011 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=25.857..283.307 rows=60060 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=50974 read=7423 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.490..17.490 rows=60060 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=161.910..161.910 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=1836 read=343 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.008..108.204 rows=100000 loops=1) Buffers: shared hit=1836 read=343 Total runtime: 102015.985 ms (53 rows) COMMIT; COMMIT