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 = 'ALGERIA') or (n1.n_name = 'ALGERIA' 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=2366953.22..2368863.70 rows=58784 width=64) (actual time=85587.208..85612.938 rows=4 loops=1) Buffers: shared hit=904276 read=530382 written=2670 -> Sort (cost=2366953.22..2367100.18 rows=58784 width=64) (actual time=85578.446..85582.870 rows=57812 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: 9666kB Buffers: shared hit=904276 read=530382 written=2670 -> Hash Join (cost=899336.44..2362296.61 rows=58784 width=64) (actual time=45299.603..85293.554 rows=57812 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=904268 read=530382 written=2670 -> Hash Join (cost=894657.44..2327312.01 rows=1471192 width=72) (actual time=45228.751..81824.561 rows=1457051 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=902086 read=530382 written=2670 -> Bitmap Heap Scan on lineitem (cost=389118.19..1738043.51 rows=18404621 width=20) (actual time=13833.698..29478.562 rows=18247310 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=669251 read=449819 written=57 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384517.04 rows=18404621 width=0) (actual time=13152.223..13152.223 rows=18356292 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 written=6 -> Hash (cost=490446.39..490446.39 rows=1207429 width=60) (actual time=31394.141..31394.141 rows=1199329 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107753kB Buffers: shared hit=232835 read=80563 written=2613 -> Hash Join (cost=15638.06..490446.39 rows=1207429 width=60) (actual time=894.385..29789.013 rows=1199329 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=232835 read=80563 written=2613 -> Seq Scan on orders (cost=0.00..406090.48 rows=15104948 width=8) (actual time=0.025..5065.491 rows=15015000 loops=1) Buffers: shared hit=208098 read=46943 written=2613 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=894.224..894.224 rows=119673 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10752kB Buffers: shared hit=24737 read=33620 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=18.993..814.409 rows=119673 loops=1) Buffers: shared hit=24737 read=33620 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.085..0.396 rows=2 loops=1) Join Filter: (((n1.n_name = 'JAPAN'::bpchar) AND (n2.n_name = 'ALGERIA'::bpchar)) OR ((n1.n_name = 'ALGERIA'::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=0.026..0.047 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=0.004..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=26.384..388.920 rows=59836 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=24734 read=33620 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.303..17.303 rows=59836 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=332 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=68.672..68.672 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=0.008..42.212 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 85646.036 ms (53 rows) COMMIT; COMMIT