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 = 'INDIA' and n2.n_name = 'RUSSIA') or (n1.n_name = 'RUSSIA' and n2.n_name = 'INDIA') ) 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=101788.350..101820.531 rows=4 loops=1) Buffers: shared hit=842403 read=593669 written=16978 -> Sort (cost=2367629.41..2367776.40 rows=58796 width=64) (actual time=101777.152..101785.473 rows=59081 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: 9845kB Buffers: shared hit=842403 read=593669 written=16978 -> Hash Join (cost=899288.17..2362971.75 rows=58796 width=64) (actual time=47309.588..101442.966 rows=59081 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=842395 read=593669 written=16978 -> Hash Join (cost=894609.17..2328012.59 rows=1469911 width=72) (actual time=47219.955..97399.533 rows=1461692 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=840213 read=593669 written=16978 -> Bitmap Heap Scan on lineitem (cost=388582.01..1738329.05 rows=18388603 width=20) (actual time=15491.978..42246.473 rows=18247062 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=565324 read=554805 written=16978 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383984.86 rows=18388603 width=0) (actual time=14812.541..14812.541 rows=18374583 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 written=12 -> Hash (cost=490919.26..490919.26 rows=1208632 width=60) (actual time=31726.852..31726.852 rows=1203132 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108094kB Buffers: shared hit=274889 read=38864 -> Hash Join (cost=15638.06..490919.26 rows=1208632 width=60) (actual time=1511.628..30786.031 rows=1203132 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=274889 read=38864 -> Seq Scan on orders (cost=0.00..406494.91 rows=15119991 width=8) (actual time=0.019..5531.209 rows=15015000 loops=1) Buffers: shared hit=251014 read=4281 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1511.444..1511.444 rows=120280 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10807kB Buffers: shared hit=23875 read=34583 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=21.590..1404.716 rows=120280 loops=1) Buffers: shared hit=23875 read=34583 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.202..0.473 rows=2 loops=1) Join Filter: (((n1.n_name = 'INDIA'::bpchar) AND (n2.n_name = 'RUSSIA'::bpchar)) OR ((n1.n_name = 'RUSSIA'::bpchar) AND (n2.n_name = 'INDIA'::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=0.033..0.061 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.002..0.005 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.032..0.037 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=27.395..677.664 rows=60140 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23872 read=34583 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=18.829..18.829 rows=60140 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=335 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=88.848..88.848 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=0.010..60.034 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 101853.618 ms (53 rows) COMMIT; COMMIT