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 = 'RUSSIA' and n2.n_name = 'SAUDI ARABIA') or (n1.n_name = 'SAUDI ARABIA' and n2.n_name = 'RUSSIA') ) 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=2380412.79..2382332.56 rows=59070 width=64) (actual time=83179.395..83203.181 rows=4 loops=1) Buffers: shared hit=775729 read=668169 written=1062 -> Sort (cost=2380412.79..2380560.46 rows=59070 width=64) (actual time=83171.420..83175.316 rows=58323 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: 9738kB Buffers: shared hit=775729 read=668169 written=1062 -> Hash Join (cost=903326.61..2375731.45 rows=59070 width=64) (actual time=42214.559..82837.487 rows=58323 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=775721 read=668169 written=1062 -> Hash Join (cost=898647.61..2340593.08 rows=1478666 width=72) (actual time=42124.059..79651.419 rows=1452644 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=773539 read=668169 written=1062 -> Bitmap Heap Scan on lineitem (cost=389704.59..1747495.43 rows=18498123 width=20) (actual time=14497.747..31206.547 rows=18246268 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=559299 read=567211 written=1024 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..385080.06 rows=18498123 width=0) (actual time=13846.894..13846.894 rows=18484985 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=2049 read=47766 written=6 -> Hash (cost=493745.30..493745.30 rows=1215818 width=60) (actual time=27625.294..27625.294 rows=1197567 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107594kB Buffers: shared hit=214240 read=100958 written=38 -> Hash Join (cost=15638.06..493745.30 rows=1215818 width=60) (actual time=1190.757..26695.624 rows=1197567 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=214240 read=100958 written=38 -> Seq Scan on orders (cost=0.00..408911.95 rows=15209895 width=8) (actual time=0.016..4670.135 rows=15015000 loops=1) Buffers: shared hit=190410 read=66403 written=38 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1190.591..1190.591 rows=119868 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10770kB Buffers: shared hit=23830 read=34555 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=33.426..1074.435 rows=119868 loops=1) Buffers: shared hit=23830 read=34555 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.241..0.361 rows=2 loops=1) Join Filter: (((n1.n_name = 'RUSSIA'::bpchar) AND (n2.n_name = 'SAUDI ARABIA'::bpchar)) OR ((n1.n_name = 'SAUDI ARABIA'::bpchar) AND (n2.n_name = 'RUSSIA'::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..0.032 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..0.007 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=32.105..514.003 rows=59934 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23827 read=34555 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=21.877..21.877 rows=59934 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=334 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=90.009..90.009 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=0.017..58.224 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 83228.585 ms (53 rows) COMMIT; COMMIT