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 = 'ETHIOPIA' and n2.n_name = 'RUSSIA') or (n1.n_name = 'RUSSIA' and n2.n_name = 'ETHIOPIA') ) 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=2359109.69..2361010.52 rows=58487 width=64) (actual time=82275.647..82302.917 rows=4 loops=1) Buffers: shared hit=984653 read=446267 written=3898 -> Sort (cost=2359109.69..2359255.91 rows=58487 width=64) (actual time=82265.899..82272.317 rows=58196 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: 9720kB Buffers: shared hit=984653 read=446267 written=3898 -> Hash Join (cost=896593.27..2354478.74 rows=58487 width=64) (actual time=42601.905..81939.443 rows=58196 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=984645 read=446267 written=3898 -> Hash Join (cost=891914.27..2319640.73 rows=1464085 width=72) (actual time=42462.335..78620.526 rows=1464951 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=982463 read=446267 written=3898 -> Bitmap Heap Scan on lineitem (cost=387834.89..1732236.58 rows=18315713 width=20) (actual time=13869.345..29530.843 rows=18247629 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=684522 read=431369 written=3898 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383255.96 rows=18315713 width=0) (actual time=13287.752..13287.752 rows=18302308 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=489031.49..489031.49 rows=1203831 width=60) (actual time=28591.710..28591.710 rows=1208004 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108532kB Buffers: shared hit=297941 read=14898 -> Hash Join (cost=15638.06..489031.49 rows=1203831 width=60) (actual time=533.527..27703.510 rows=1208004 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=297941 read=14898 -> Seq Scan on orders (cost=0.00..404880.36 rows=15059936 width=8) (actual time=0.022..4991.728 rows=15015000 loops=1) Buffers: shared hit=239788 read=14493 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=533.354..533.354 rows=120536 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10830kB Buffers: shared hit=58153 read=405 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=29.911..456.672 rows=120536 loops=1) Buffers: shared hit=58153 read=405 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.145..0.462 rows=2 loops=1) Join Filter: (((n1.n_name = 'ETHIOPIA'::bpchar) AND (n2.n_name = 'RUSSIA'::bpchar)) OR ((n1.n_name = 'RUSSIA'::bpchar) AND (n2.n_name = 'ETHIOPIA'::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=0.031..0.051 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..0.013 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=30.173..208.352 rows=60268 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58150 read=405 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=20.799..20.799 rows=60268 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=334 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=138.255..138.255 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..89.096 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 82327.661 ms (53 rows) COMMIT; COMMIT