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 = 'INDIA' and n2.n_name = 'IRAN') or (n1.n_name = 'IRAN' and n2.n_name = 'INDIA') ) 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=2366366.58..2368267.48 rows=58489 width=64) (actual time=155443.201..155470.804 rows=4 loops=1) Buffers: shared hit=932836 read=505906 dirtied=851 written=4868 -> Sort (cost=2366366.58..2366512.81 rows=58489 width=64) (actual time=155432.430..155438.427 rows=58635 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: 9782kB Buffers: shared hit=932836 read=505906 dirtied=851 written=4868 -> Hash Join (cost=897897.69..2361735.46 rows=58489 width=64) (actual time=68238.053..155116.670 rows=58635 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=932828 read=505906 dirtied=851 written=4868 -> Hash Join (cost=893218.69..2326929.77 rows=1462468 width=72) (actual time=68024.147..150655.399 rows=1457400 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=930646 read=505906 dirtied=851 written=4868 -> Bitmap Heap Scan on lineitem (cost=386219.58..1736697.90 rows=18295488 width=20) (actual time=22360.924..81902.704 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=659296 read=462953 dirtied=851 written=4519 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381645.71 rows=18295488 width=0) (actual time=21681.648..21681.648 rows=18410988 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 written=10 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=45661.337..45661.337 rows=1199406 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107760kB Buffers: shared hit=271350 read=42953 written=349 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=3677.519..44603.153 rows=1199406 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=271350 read=42953 written=349 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.016..9596.615 rows=15015000 loops=1) Buffers: shared hit=247454 read=8347 written=349 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=3677.295..3677.295 rows=120316 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10810kB Buffers: shared hit=23896 read=34606 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=36.647..3561.636 rows=120316 loops=1) Buffers: shared hit=23896 read=34606 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.137..0.427 rows=2 loops=1) Join Filter: (((n1.n_name = 'INDIA'::bpchar) AND (n2.n_name = 'IRAN'::bpchar)) OR ((n1.n_name = 'IRAN'::bpchar) AND (n2.n_name = 'INDIA'::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=0.014..0.038 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=0.004..0.007 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=47.207..1754.383 rows=60158 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23893 read=34606 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=36.760..36.760 rows=60158 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=336 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=213.200..213.200 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=0.020..159.488 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 155507.190 ms (53 rows) COMMIT; COMMIT