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 = 'EGYPT' and n2.n_name = 'PERU') or (n1.n_name = 'PERU' and n2.n_name = 'EGYPT') ) 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=2367629.41..2369540.28 rows=58796 width=64) (actual time=88131.019..88160.067 rows=4 loops=1) Buffers: shared hit=1357136 read=78955 written=19 -> Sort (cost=2367629.41..2367776.40 rows=58796 width=64) (actual time=88120.924..88126.847 rows=57885 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: 9677kB Buffers: shared hit=1357136 read=78955 written=19 -> Hash Join (cost=899288.17..2362971.75 rows=58796 width=64) (actual time=44555.892..87827.605 rows=57885 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1357128 read=78955 written=19 -> Hash Join (cost=894609.17..2328012.59 rows=1469911 width=72) (actual time=44456.550..84389.981 rows=1453300 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1354946 read=78955 written=19 -> Bitmap Heap Scan on lineitem (cost=388582.01..1738329.05 rows=18388603 width=20) (actual time=15869.744..33409.850 rows=18247062 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=1041520 read=78609 written=17 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383984.86 rows=18388603 width=0) (actual time=15162.866..15162.866 rows=18374583 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=490919.26..490919.26 rows=1208632 width=60) (actual time=28586.034..28586.034 rows=1195234 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107385kB Buffers: shared hit=313426 read=346 written=2 -> Hash Join (cost=15638.06..490919.26 rows=1208632 width=60) (actual time=644.567..27364.840 rows=1195234 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=313426 read=346 written=2 -> Seq Scan on orders (cost=0.00..406494.91 rows=15119991 width=8) (actual time=0.015..5645.254 rows=15015000 loops=1) Buffers: shared hit=255282 read=13 written=2 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=644.431..644.431 rows=119757 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10760kB Buffers: shared hit=58144 read=333 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=20.450..557.904 rows=119757 loops=1) Buffers: shared hit=58144 read=333 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.120..0.464 rows=2 loops=1) Join Filter: (((n1.n_name = 'EGYPT'::bpchar) AND (n2.n_name = 'PERU'::bpchar)) OR ((n1.n_name = 'PERU'::bpchar) AND (n2.n_name = 'EGYPT'::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=0.024..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=0.006..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=24.924..257.394 rows=59878 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58141 read=333 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=16.912..16.912 rows=59878 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=333 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=96.147..96.147 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=0.007..65.068 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 88192.712 ms (53 rows) COMMIT; COMMIT