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 = 'JAPAN' and n2.n_name = 'JORDAN') or (n1.n_name = 'JORDAN' and n2.n_name = 'JAPAN') ) 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=2374559.91..2376474.49 rows=58910 width=64) (actual time=91257.394..91287.631 rows=4 loops=1) Buffers: shared hit=753982 read=687331 dirtied=48 written=155 -> Sort (cost=2374559.91..2374707.19 rows=58910 width=64) (actual time=91238.137..91248.690 rows=58108 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: 9708kB Buffers: shared hit=753982 read=687331 dirtied=48 written=155 -> Hash Join (cost=901184.74..2369892.41 rows=58910 width=64) (actual time=45491.683..90819.230 rows=58108 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=753974 read=687331 dirtied=48 written=155 -> Hash Join (cost=896505.74..2334874.66 rows=1472755 width=72) (actual time=45358.995..87425.736 rows=1457381 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=751792 read=687331 dirtied=48 written=155 -> Bitmap Heap Scan on lineitem (cost=388534.66..1743085.35 rows=18424179 width=20) (actual time=14376.595..34215.482 rows=18246746 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=443387 read=680998 written=149 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383928.62 rows=18424179 width=0) (actual time=13778.968..13778.968 rows=18448318 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=76 read=49739 written=21 -> Hash (cost=492803.29..492803.29 rows=1213423 width=60) (actual time=30981.681..30981.681 rows=1202012 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107994kB Buffers: shared hit=308405 read=6333 dirtied=48 written=6 -> Hash Join (cost=15638.06..492803.29 rows=1213423 width=60) (actual time=693.903..29877.745 rows=1202012 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=308405 read=6333 dirtied=48 written=6 -> Seq Scan on orders (cost=0.00..408106.27 rows=15179927 width=8) (actual time=0.013..5493.141 rows=15015000 loops=1) Buffers: shared hit=250303 read=6004 dirtied=48 written=6 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=693.766..693.766 rows=119666 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10752kB Buffers: shared hit=58102 read=329 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=41.303..598.883 rows=119666 loops=1) Buffers: shared hit=58102 read=329 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.176..0.392 rows=2 loops=1) Join Filter: (((n1.n_name = 'JAPAN'::bpchar) AND (n2.n_name = 'JORDAN'::bpchar)) OR ((n1.n_name = 'JORDAN'::bpchar) AND (n2.n_name = 'JAPAN'::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=0.016..0.034 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=0.007..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=38.218..277.170 rows=59833 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58099 read=329 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=27.342..27.342 rows=59833 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=5 read=329 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=129.793..129.793 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=0.011..80.039 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 91316.270 ms (53 rows) COMMIT; COMMIT