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 = 'MOZAMBIQUE' and n2.n_name = 'INDONESIA') or (n1.n_name = 'INDONESIA' and n2.n_name = 'MOZAMBIQUE') ) 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=2361363.41..2363262.32 rows=58428 width=64) (actual time=93301.687..93327.092 rows=4 loops=1) Buffers: shared hit=1048673 read=386193 written=7789 -> Sort (cost=2361363.41..2361509.48 rows=58428 width=64) (actual time=93293.506..93298.508 rows=57455 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: 9616kB Buffers: shared hit=1048673 read=386193 written=7789 -> Hash Join (cost=896558.91..2356737.56 rows=58428 width=64) (actual time=47308.709..92946.680 rows=57455 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1048665 read=386193 written=7789 -> Hash Join (cost=891879.91..2321968.18 rows=1460698 width=72) (actual time=47160.678..89663.945 rows=1460691 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1046483 read=386193 written=7789 -> Bitmap Heap Scan on lineitem (cost=386340.66..1733296.89 rows=18273349 width=20) (actual time=15379.017..34606.092 rows=18247310 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=762845 read=356225 written=7756 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381772.32 rows=18273349 width=0) (actual time=14765.571..14765.571 rows=18356292 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=12 read=49803 written=130 -> Hash (cost=490446.39..490446.39 rows=1207429 width=60) (actual time=31780.490..31780.490 rows=1202580 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108045kB Buffers: shared hit=283638 read=29968 written=33 -> Hash Join (cost=15638.06..490446.39 rows=1207429 width=60) (actual time=597.889..30654.094 rows=1202580 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=283638 read=29968 written=33 -> Seq Scan on orders (cost=0.00..406090.48 rows=15104948 width=8) (actual time=0.020..6211.426 rows=15015000 loops=1) Buffers: shared hit=225406 read=29635 written=33 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=597.689..597.689 rows=120032 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10785kB Buffers: shared hit=58232 read=333 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=19.029..513.067 rows=120032 loops=1) Buffers: shared hit=58232 read=333 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.156..0.425 rows=2 loops=1) Join Filter: (((n1.n_name = 'MOZAMBIQUE'::bpchar) AND (n2.n_name = 'INDONESIA'::bpchar)) OR ((n1.n_name = 'INDONESIA'::bpchar) AND (n2.n_name = 'MOZAMBIQUE'::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=0.020..0.041 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..0.010 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=23.676..236.940 rows=60016 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58229 read=333 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=16.076..16.076 rows=60016 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=145.411..145.411 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=0.018..94.945 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 93357.810 ms (53 rows) COMMIT; COMMIT