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 = 'JAPAN') or (n1.n_name = 'JAPAN' 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=2377952.71..2379870.63 rows=59013 width=64) (actual time=95666.349..95698.941 rows=4 loops=1) Buffers: shared hit=432895 read=1010518 written=2222 -> Sort (cost=2377952.71..2378100.24 rows=59013 width=64) (actual time=95655.133..95664.513 rows=59568 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: 9913kB Buffers: shared hit=432895 read=1010518 written=2222 -> Hash Join (cost=902000.87..2373276.30 rows=59013 width=64) (actual time=49701.775..95377.643 rows=59568 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=432887 read=1010518 written=2222 -> Hash Join (cost=897321.87..2338205.51 rows=1475330 width=72) (actual time=49557.516..91868.460 rows=1463325 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=430705 read=1010518 written=2222 -> Bitmap Heap Scan on lineitem (cost=388864.84..1745783.70 rows=18456391 width=20) (actual time=15902.672..37174.894 rows=18227973 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=226227 read=900038 written=2205 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384250.74 rows=18456391 width=0) (actual time=15201.382..15201.382 rows=18484771 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=1704 read=48111 written=1781 -> Hash (cost=493274.29..493274.29 rows=1214620 width=60) (actual time=33654.021..33654.021 rows=1203655 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108141kB Buffers: shared hit=204478 read=110480 written=17 -> Hash Join (cost=15638.06..493274.29 rows=1214620 width=60) (actual time=1041.800..32118.912 rows=1203655 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=204478 read=110480 written=17 -> Seq Scan on orders (cost=0.00..408509.11 rows=15194911 width=8) (actual time=0.015..6135.046 rows=15000000 loops=1) Buffers: shared hit=180683 read=75877 written=17 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1041.658..1041.658 rows=119813 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10765kB Buffers: shared hit=23795 read=34603 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=20.985..943.734 rows=119813 loops=1) Buffers: shared hit=23795 read=34603 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.168..0.415 rows=2 loops=1) Join Filter: (((n1.n_name = 'IRAQ'::bpchar) AND (n2.n_name = 'JAPAN'::bpchar)) OR ((n1.n_name = 'JAPAN'::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=0.020..0.043 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..0.006 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=25.308..450.670 rows=59906 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23792 read=34603 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=16.951..16.951 rows=59906 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=331 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=142.456..142.456 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=0.016..91.438 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 95727.253 ms (53 rows) COMMIT; COMMIT